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KVM-задания периодически «тормозят»/«зависают» на Debian 10

tag-icon • tag-icon debian kvm-virtualization debian-buster hangs libvirt-guests
KVM-задания периодически «тормозят»/«зависают» на Debian 10

Я использую KVM на Debian 10 в качестве хоста и пока что двух гостей, которые также являются Debian 10. Гости часто "заикаются", я имею в виду, что, по крайней мере, несколько раз в час гость перестает отвечать на запросы примерно на 10 секунд. Если у меня открыт сеанс SSH и я печатаю, я ничего не могу сделать, пока гость не "разморозится". Похоже, что то, что я набрал непосредственно перед "заморозкой", все еще буферизируется, потому что как только гость разморозится, все это появится в командной строке.

Хост-бокс ничем подобным не страдает.

Хост является частью активного/пассивного кластера со следующей конфигурацией:

  1. Два диска работают в конфигурации RAID-1, два раздела сформированы /dev/md0для корневой файловой системы, два больших раздела объединены /dev/md1для гостевых данных.
  2. /dev/md1используется для устройства DRBD между двумя хостами кластера. Протокол C для синхронной записи используется между хостами.
  3. LVM накладывается поверх устройства DRBD. Гости используют необработанные тома LVM для дисков.
  4. Второго хоста НЕТ, он пока не запущен в эксплуатацию.

Я на самом деле ничего не менял ни в настройках хоста KVM, ни в настройках гостя, если я правильно помню, просто использовал настройки по умолчанию. В любом случае, вот моя конфигурация:

Определение гостевого домена XML:

% cat bind.xml 
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh edit bind
or other application using the libvirt API.
-->

<domain type='kvm'>
  <name>bind</name>
  <uuid>6fc751ea-2ce0-4e69-b098-48b8ea0fc78a</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://debian.org/debian/10"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-q35-3.1'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <vmport state='off'/>
  </features>
  <cpu mode='host-model' check='partial'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native'/>
      <source dev='/dev/vgr0/bind'/>
      <target dev='vda' bus='virtio'/>
      <boot order='2'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='sda' bus='sata'/>
      <readonly/>
      <boot order='1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0' model='qemu-xhci' ports='15'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
    </controller>
    <controller type='sata' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pcie-root'/>
    <controller type='pci' index='1' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='1' port='0x10'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
    </controller>
    <controller type='pci' index='2' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='2' port='0x11'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='3' port='0x12'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
    </controller>
    <controller type='pci' index='4' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='4' port='0x13'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
    </controller>
    <controller type='pci' index='5' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='5' port='0x14'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
    </controller>
    <controller type='pci' index='6' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='6' port='0x15'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>
    </controller>
    <controller type='pci' index='7' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='7' port='0x16'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x6'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:da:43:59'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:25:ea:03'/>
      <source bridge='br1'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <channel type='unix'>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
    <input type='tablet' bus='usb'>
      <address type='usb' bus='0' port='1'/>
    </input>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='spice' autoport='yes'>
      <listen type='address'/>
      <image compression='off'/>
    </graphics>
    <sound model='ich9'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1b' function='0x0'/>
    </sound>
    <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </video>
    <redirdev bus='usb' type='spicevmc'>
      <address type='usb' bus='0' port='2'/>
    </redirdev>
    <redirdev bus='usb' type='spicevmc'>
      <address type='usb' bus='0' port='3'/>
    </redirdev>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </memballoon>
    <rng model='virtio'>
      <backend model='random'>/dev/urandom</backend>
      <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
    </rng>
  </devices>
</domain>

Настройки QEMU:

% virsh -c qemu:///system capabilities

<capabilities>

  <host>
    <uuid>53f34900-9b09-11e2-98e4-6c3be51bf934</uuid>
    <cpu>
      <arch>x86_64</arch>
      <model>IvyBridge-IBRS</model>
      <vendor>Intel</vendor>
      <microcode version='33'/>
      <topology sockets='1' cores='4' threads='1'/>
      <feature name='ds'/>
      <feature name='acpi'/>
      <feature name='ss'/>
      <feature name='ht'/>
      <feature name='tm'/>
      <feature name='pbe'/>
      <feature name='dtes64'/>
      <feature name='monitor'/>
      <feature name='ds_cpl'/>
      <feature name='vmx'/>
      <feature name='smx'/>
      <feature name='est'/>
      <feature name='tm2'/>
      <feature name='xtpr'/>
      <feature name='pdcm'/>
      <feature name='pcid'/>
      <feature name='osxsave'/>
      <feature name='arat'/>
      <feature name='md-clear'/>
      <feature name='stibp'/>
      <feature name='ssbd'/>
      <feature name='xsaveopt'/>
      <feature name='invtsc'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>
    </cpu>
    <power_management>
      <suspend_mem/>
    </power_management>
    <iommu support='no'/>
    <migration_features>
      <live/>
      <uri_transports>
        <uri_transport>tcp</uri_transport>
        <uri_transport>rdma</uri_transport>
      </uri_transports>
    </migration_features>
    <topology>
      <cells num='1'>
        <cell id='0'>
          <memory unit='KiB'>16298904</memory>
          <pages unit='KiB' size='4'>4074726</pages>
          <pages unit='KiB' size='2048'>0</pages>
          <distances>
            <sibling id='0' value='10'/>
          </distances>
          <cpus num='4'>
            <cpu id='0' socket_id='0' core_id='0' siblings='0'/>
            <cpu id='1' socket_id='0' core_id='1' siblings='1'/>
            <cpu id='2' socket_id='0' core_id='2' siblings='2'/>
            <cpu id='3' socket_id='0' core_id='3' siblings='3'/>
          </cpus>
        </cell>
      </cells>
    </topology>
    <cache>
      <bank id='0' level='3' type='both' size='6' unit='MiB' cpus='0-3'/>
    </cache>
    <secmodel>
      <model>apparmor</model>
      <doi>0</doi>
    </secmodel>
    <secmodel>
      <model>dac</model>
      <doi>0</doi>
      <baselabel type='kvm'>+64055:+64055</baselabel>
      <baselabel type='qemu'>+64055:+64055</baselabel>
    </secmodel>
  </host>

  <guest>
    <os_type>hvm</os_type>
    <arch name='i686'>
      <wordsize>32</wordsize>
      <emulator>/usr/bin/qemu-system-i386</emulator>
      <machine maxCpus='255'>pc-i440fx-3.1</machine>
      <machine canonical='pc-i440fx-3.1' maxCpus='255'>pc</machine>
      <machine maxCpus='1'>isapc</machine>
      <machine maxCpus='255'>pc-1.1</machine>
      <machine maxCpus='255'>pc-1.2</machine>
      <machine maxCpus='255'>pc-1.3</machine>
      <machine maxCpus='255'>pc-i440fx-2.8</machine>
      <machine maxCpus='255'>pc-1.0</machine>
      <machine maxCpus='255'>pc-i440fx-2.9</machine>
      <machine maxCpus='255'>pc-i440fx-2.6</machine>
      <machine maxCpus='255'>pc-i440fx-2.7</machine>
      <machine maxCpus='128'>xenfv</machine>
      <machine maxCpus='255'>pc-i440fx-2.3</machine>
      <machine maxCpus='255'>pc-i440fx-2.4</machine>
      <machine maxCpus='255'>pc-i440fx-2.5</machine>
      <machine maxCpus='255'>pc-i440fx-2.1</machine>
      <machine maxCpus='255'>pc-i440fx-2.2</machine>
      <machine maxCpus='288'>pc-q35-3.1</machine>
      <machine canonical='pc-q35-3.1' maxCpus='288'>q35</machine>
      <machine maxCpus='255'>pc-i440fx-2.0</machine>
      <machine maxCpus='288'>pc-q35-2.11</machine>
      <machine maxCpus='288'>pc-q35-2.12</machine>
      <machine maxCpus='288'>pc-q35-3.0</machine>
      <machine maxCpus='1'>xenpv</machine>
      <machine maxCpus='288'>pc-q35-2.10</machine>
      <machine maxCpus='255'>pc-i440fx-1.7</machine>
      <machine maxCpus='288'>pc-q35-2.9</machine>
      <machine maxCpus='255'>pc-0.15</machine>
      <machine maxCpus='255'>pc-i440fx-1.5</machine>
      <machine maxCpus='255'>pc-q35-2.7</machine>
      <machine maxCpus='255'>pc-i440fx-1.6</machine>
      <machine maxCpus='255'>pc-i440fx-2.11</machine>
      <machine maxCpus='288'>pc-q35-2.8</machine>
      <machine maxCpus='255'>pc-0.13</machine>
      <machine maxCpus='255'>pc-0.14</machine>
      <machine maxCpus='255'>pc-i440fx-3.0</machine>
      <machine maxCpus='255'>pc-i440fx-2.12</machine>
      <machine maxCpus='255'>pc-q35-2.4</machine>
      <machine maxCpus='255'>pc-q35-2.5</machine>
      <machine maxCpus='255'>pc-q35-2.6</machine>
      <machine maxCpus='255'>pc-i440fx-1.4</machine>
      <machine maxCpus='255'>pc-i440fx-2.10</machine>
      <machine maxCpus='255'>pc-0.11</machine>
      <machine maxCpus='255'>pc-0.12</machine>
      <machine maxCpus='255'>pc-0.10</machine>
      <domain type='qemu'/>
      <domain type='kvm'/>
    </arch>
    <features>
      <cpuselection/>
      <deviceboot/>
      <disksnapshot default='on' toggle='no'/>
      <acpi default='on' toggle='yes'/>
      <apic default='on' toggle='no'/>
      <pae/>
      <nonpae/>
    </features>
  </guest>

  <guest>
    <os_type>hvm</os_type>
    <arch name='x86_64'>
      <wordsize>64</wordsize>
      <emulator>/usr/bin/qemu-system-x86_64</emulator>
      <machine maxCpus='255'>pc-i440fx-3.1</machine>
      <machine canonical='pc-i440fx-3.1' maxCpus='255'>pc</machine>
      <machine maxCpus='1'>isapc</machine>
      <machine maxCpus='255'>pc-1.1</machine>
      <machine maxCpus='255'>pc-1.2</machine>
      <machine maxCpus='255'>pc-1.3</machine>
      <machine maxCpus='255'>pc-i440fx-2.8</machine>
      <machine maxCpus='255'>pc-1.0</machine>
      <machine maxCpus='255'>pc-i440fx-2.9</machine>
      <machine maxCpus='255'>pc-i440fx-2.6</machine>
      <machine maxCpus='255'>pc-i440fx-2.7</machine>
      <machine maxCpus='128'>xenfv</machine>
      <machine maxCpus='255'>pc-i440fx-2.3</machine>
      <machine maxCpus='255'>pc-i440fx-2.4</machine>
      <machine maxCpus='255'>pc-i440fx-2.5</machine>
      <machine maxCpus='255'>pc-i440fx-2.1</machine>
      <machine maxCpus='255'>pc-i440fx-2.2</machine>
      <machine maxCpus='288'>pc-q35-3.1</machine>
      <machine canonical='pc-q35-3.1' maxCpus='288'>q35</machine>
      <machine maxCpus='255'>pc-i440fx-2.0</machine>
      <machine maxCpus='288'>pc-q35-2.11</machine>
      <machine maxCpus='288'>pc-q35-2.12</machine>
      <machine maxCpus='288'>pc-q35-3.0</machine>
      <machine maxCpus='1'>xenpv</machine>
      <machine maxCpus='288'>pc-q35-2.10</machine>
      <machine maxCpus='255'>pc-i440fx-1.7</machine>
      <machine maxCpus='288'>pc-q35-2.9</machine>
      <machine maxCpus='255'>pc-0.15</machine>
      <machine maxCpus='255'>pc-i440fx-1.5</machine>
      <machine maxCpus='255'>pc-q35-2.7</machine>
      <machine maxCpus='255'>pc-i440fx-1.6</machine>
      <machine maxCpus='255'>pc-i440fx-2.11</machine>
      <machine maxCpus='288'>pc-q35-2.8</machine>
      <machine maxCpus='255'>pc-0.13</machine>
      <machine maxCpus='255'>pc-i440fx-2.12</machine>
      <machine maxCpus='255'>pc-0.14</machine>
      <machine maxCpus='255'>pc-i440fx-3.0</machine>
      <machine maxCpus='255'>pc-q35-2.4</machine>
      <machine maxCpus='255'>pc-q35-2.5</machine>
      <machine maxCpus='255'>pc-q35-2.6</machine>
      <machine maxCpus='255'>pc-i440fx-1.4</machine>
      <machine maxCpus='255'>pc-i440fx-2.10</machine>
      <machine maxCpus='255'>pc-0.11</machine>
      <machine maxCpus='255'>pc-0.12</machine>
      <machine maxCpus='255'>pc-0.10</machine>
      <domain type='qemu'/>
      <domain type='kvm'/>
    </arch>
    <features>
      <cpuselection/>
      <deviceboot/>
      <disksnapshot default='on' toggle='no'/>
      <acpi default='on' toggle='yes'/>
      <apic default='on' toggle='no'/>
    </features>
  </guest>

</capabilities>

Аппаратное обеспечение:

% lshw
    description: Desktop Computer
    product: HP Compaq Elite 8300 CMT (QV993AV)
    vendor: Hewlett-Packard
    serial: 
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 smp vsyscall32
    configuration: administrator_password=disabled boot=normal chassis=desktop family=103C_53307F G=D frontpanel_password=disabled keyboard_password=disabled power-on_password=disabled sku=.. uuid=0049F353-099B-E211-98E4-6C3BE51BF934
  *-core
       description: Motherboard
       product: 3396
       vendor: Hewlett-Packard
       physical id: 0
       serial: ...
     *-firmware
          description: BIOS
          vendor: Hewlett-Packard
          physical id: 0
          version: K01 v02.83
          date: 10/29/2012
          size: 64KiB
          capacity: 16MiB
          capabilities: pci pnp upgrade shadowing cdboot bootselect edd int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification netboot uefi
     *-cache:0
          description: L1 cache
          physical id: 4
          slot: CPU Internal L1
          size: 256KiB
          capacity: 256KiB
          capabilities: internal write-through unified
          configuration: level=1
     *-cache:1
          description: L2 cache
          physical id: 5
          slot: CPU Internal L2
          size: 1MiB
          capacity: 1MiB
          capabilities: internal write-through unified
          configuration: level=2
     *-cache:2
          description: L3 cache
          physical id: 6
          slot: CPU Internal L3
          size: 6MiB
          capacity: 6MiB
          capabilities: internal write-back unified
          configuration: level=3
     *-memory
          description: System Memory
          physical id: 7
          slot: System board or motherboard
          size: 16GiB
        *-bank:0
             description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
             product: M378B5173EB0-YK0
             vendor: Samsung
             physical id: 0
             serial: 
             slot: DIMM4
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
        *-bank:1
             description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
             product: M378B5173EB0-YK0
             vendor: Samsung
             physical id: 1
             serial: 
             slot: DIMM3
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
        *-bank:2
             description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
             product: M378B5173EB0-YK0
             vendor: Samsung
             physical id: 2
             serial: 
             slot: DIMM2
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
        *-bank:3
             description: DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
             product: M378B5173EB0-YK0
             vendor: Samsung
             physical id: 3
             serial: 
             slot: DIMM1
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
     *-cpu
          description: CPU
          product: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
          vendor: Intel Corp.
          physical id: e
          bus info: cpu@0
          version: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
          slot: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
          size: 1637MHz
          capacity: 3800MHz
          width: 64 bits
          clock: 100MHz
          capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d cpufreq
          configuration: cores=4 enabledcores=4 threads=4
     *-pci
          description: Host bridge
          product: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 09
          width: 32 bits
          clock: 33MHz
          configuration: driver=ivb_uncore
          resources: irq:0
        

...

        *-pci:0
             description: PCI bridge
             product: 7 Series/C216 Chipset Family PCI Express Root Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: c4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:16 ioport:e000(size=4096) memory:f7c00000-f7cfffff
           *-network:0
                description: Ethernet interface
                product: 82571EB Gigabit Ethernet Controller
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:01:00.0
                logical name: enp1s0f0
                version: 06
                serial: 68:05:ca:1a:a1:94
                size: 1Gbit/s
                capacity: 1Gbit/s
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=5.11-2 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
                resources: irq:29 memory:f7ca0000-f7cbffff memory:f7c80000-f7c9ffff ioport:e020(size=32) memory:f7c60000-f7c7ffff
           *-network:1
                description: Ethernet interface
                product: 82571EB Gigabit Ethernet Controller
                vendor: Intel Corporation
                physical id: 0.1
                bus info: pci@0000:01:00.1
                logical name: enp1s0f1
                version: 06
                serial: 68:05:ca:1a:a1:95
                size: 1Gbit/s
                capacity: 1Gbit/s
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=5.11-2 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
                resources: irq:31 memory:f7c40000-f7c5ffff memory:f7c20000-f7c3ffff ioport:e000(size=32) memory:f7c00000-f7c1ffff
        *-usb:2
             description: USB controller
             product: 7 Series/C216 Chipset Family USB Enhanced Host Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=0
             resources: irq:23 memory:f7d37000-f7d373ff
           *-usbhost
                product: EHCI Host Controller
                vendor: Linux 4.19.0-13-amd64 ehci_hcd
                physical id: 1
                bus info: usb@4
                logical name: usb4
                version: 4.19
                capabilities: usb-2.00
                configuration: driver=hub slots=3 speed=480Mbit/s
              *-usb
                   description: USB hub
                   product: Integrated Rate Matching Hub
                   vendor: Intel Corp.
                   physical id: 1
                   bus info: usb@4:1
                   version: 0.00
                   capabilities: usb-2.00
                   configuration: driver=hub slots=8 speed=480Mbit/s
        *-pci:1
             description: PCI bridge
             product: 82801 PCI Bridge
             vendor: Intel Corporation
             physical id: 1e
             bus info: pci@0000:00:1e.0
             version: a4
             width: 32 bits
             clock: 33MHz
             capabilities: pci subtractive_decode bus_master cap_list
        *-isa
             description: ISA bridge
             product: Q77 Express Chipset LPC Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: driver=lpc_ich latency=0
             resources: irq:0
        *-sata
             description: SATA controller
             product: 7 Series/C210 Series Chipset Family 6-port SATA Controller [AHCI mode]
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi0
             logical name: scsi1
             logical name: scsi2
             version: 04
             width: 32 bits
             clock: 66MHz
             capabilities: sata msi pm ahci_1.0 bus_master cap_list emulated
             configuration: driver=ahci latency=0
             resources: irq:28 ioport:f0d0(size=8) ioport:f0c0(size=4) ioport:f0b0(size=8) ioport:f0a0(size=4) ioport:f060(size=32) memory:f7d36000-f7d367ff
           *-disk:0
                description: ATA Disk
                product: TOSHIBA HDWD120
                vendor: Western Digital
                physical id: 0
                bus info: scsi@0:0.0.0
                logical name: /dev/sda
                version: ACF0
                serial: 
                size: 1863GiB (2TB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 logicalsectorsize=512 sectorsize=4096 signature=4de1036d
              *-volume:0
                   description: EXT4 volume
                   vendor: Linux
                   physical id: 1
                   bus info: scsi@0:0.0.0,1
                   logical name: /dev/sda1
                   logical name: /boot
                   version: 1.0
                   serial: 340f09ca-7a41-472e-99e2-d72aecd7517f
                   size: 285MiB
                   capacity: 285MiB
                   capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink 64bit extents ext4 ext2 initialized
                   configuration: created=2020-12-09 19:54:51 filesystem=ext4 lastmountpoint=/boot modified=2020-12-31 21:12:10 mount.fstype=ext4 mount.options=rw,relatime,stripe=4 mounted=2020-12-31 19:21:14 state=mounted
              *-volume:1
                   description: Linux raid autodetect partition
                   physical id: 2
                   bus info: scsi@0:0.0.0,2
                   logical name: /dev/sda2
                   capacity: 37GiB
                   capabilities: primary multi
              *-volume:2
                   description: Linux raid autodetect partition
                   physical id: 3
                   bus info: scsi@0:0.0.0,3
                   logical name: /dev/sda3
                   capacity: 1825GiB
                   capabilities: primary multi
           *-disk:1
                description: ATA Disk
                product: TOSHIBA HDWD120
                vendor: Western Digital
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/sdb
                version: ACF0
                serial: 
                size: 1863GiB (2TB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 logicalsectorsize=512 sectorsize=4096 signature=b3257d2e
              *-volume:0
             
...

решение1

Виноват был не DRBD, а проблемы были в режимах кеша хоста и виртуальной машины, а также в режимах ввода-вывода, writethroughв настройках виртуальной машины и других, которые, по-видимому, снижали пропускную способность диска (rw) до нескольких сотен килобайт в секунду, поэтому syncs были крайне медленными. После их оптимизации проблема исчезла.

решение2

Гипервизор (хост) может подкачивать память. Хост имеет только 16 ГБ ОЗУ на ваш аппаратный вывод. *-описание памяти: Физический идентификатор системной памяти: 7 слот: Размер системной платы или материнской платы: 16 ГБ

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