[PVE-User] ZFS Checksum Error in VM but not on Host

[Harald Leithner]

Hi,

I'm not sure if this is Proxmox/Qemu related but I try it here.

We have a VM on a ZFS Pool with Proxmox kernel for ZFS, so the result is

RAIDZ1 (2 Disks) -> qemu -> ZFS (1 Disk)

We got 2 Mails from ZFS inside the VM:

---

ZFS has detected a checksum error:

    eid: 37
  class: checksum
   host: backup
   time: 2017-07-21 15:07:59+0200
  vtype: disk
  vpath: /dev/sdc1
  vguid: 0x003AC1491C2AC7D2
  cksum: 1
   read: 0
  write: 0
   pool: backup

---

ZFS has detected a data error:

    eid: 36
  class: data
   host: backup
   time: 2017-07-21 15:07:59+0200
   pool: backup

---

The status of the zfs pool inside the VM:

---

  zpool status -v
   pool: backup
  state: ONLINE
status: One or more devices has experienced an error resulting in data
         corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
         entire pool from backup.
    see: http://zfsonlinux.org/msg/ZFS-8000-8A
   scan: scrub repaired 0 in 0h42m with 0 errors on Sun Jul  9 01:06:26 2017
config:

         NAME        STATE     READ WRITE CKSUM
         backup      ONLINE       0     0    13
           sdc       ONLINE       0     0    26

errors: Permanent errors have been detected in the following files:


/battlefield/backup/kunde/server/data/d7/d79c0feb29ef024ce0164253ee08e6daa986bd1d599f4640167de2c3d7828524 


---

But on the host there is no error:

  zpool status -v

   pool: slow
  state: ONLINE
   scan: scrub in progress since Fri Jul 21 15:45:13 2017
     54.0G scanned out of 486G at 60.8M/s, 2h1m to go
     0 repaired, 11.11% done
config:

         NAME        STATE     READ WRITE CKSUM
         slow        ONLINE       0     0     0
           mirror-0  ONLINE       0     0     0
             sda2    ONLINE       0     0     0
             sdb2    ONLINE       0     0     0

errors: No known data errors


(Scrub is also finished with no errors)

---

HOST:

  pveversion --verbose
proxmox-ve: 5.0-16 (running kernel: 4.10.15-1-pve)
pve-manager: 5.0-23 (running version: 5.0-23/af4267bf)
pve-kernel-4.10.15-1-pve: 4.10.15-15
pve-kernel-4.4.35-1-pve: 4.4.35-77
pve-kernel-4.10.8-1-pve: 4.10.8-7
pve-kernel-4.4.59-1-pve: 4.4.59-87
pve-kernel-4.10.11-1-pve: 4.10.11-9
pve-kernel-4.10.17-1-pve: 4.10.17-16
libpve-http-server-perl: 2.0-5
lvm2: 2.02.168-pve2
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-12
qemu-server: 5.0-14
pve-firmware: 2.0-2
libpve-common-perl: 5.0-16
libpve-guest-common-perl: 2.0-11
libpve-access-control: 5.0-5
libpve-storage-perl: 5.0-12
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-2
pve-docs: 5.0-9
pve-qemu-kvm: 2.9.0-2
pve-container: 2.0-14
pve-firewall: 3.0-2
pve-ha-manager: 2.0-2
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.0.8-3
lxcfs: 2.0.7-pve2
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1
zfsutils-linux: 0.6.5.9-pve16~bpo90

---

VM:

Linux backup 4.10.15-1-pve #1 SMP PVE 4.10.15-12 (Mon, 12 Jun 2017 
11:18:07 +0200) x86_64 GNU/Linux

zfsutils-linux: 0.6.5.9-pve16~bpo90


Some hints would be very appreciated!

bye
Harald


-- 
Harald Leithner

ITronic
Wiedner Hauptstraße 120/5.1, 1050 Wien, Austria
Tel: +43-1-545 0 604
Mobil: +43-699-123 78 4 78
Mail: leithner at itronic.at | itronic.at