[PVE-User] LVM over ISCSI issue

Yannis Milios yannis.milios at gmail.com
Tue Aug 11 10:25:27 CEST 2020

>> qemu-img: error while writing at byte 14827520: Input/output error
>> TASK ERROR: storage migration failed: copy failed: command
'/usr/bin/qemu-img convert -p -n -f raw -O raw
/dev/vg_nas02/vm-2014-disk-0' failed: exit code 1

Looks like you are trying to clone an existing VM stored on the NFS server
to the iSCSI target. Problem is that both the NFS server and iSCSI target
are served by the same machine, so my best guess is that the I/O on the
storage server is getting saturated. Have you tried creating a new VM on
iSCSI instead ? Can you also try setting bandwidth limits at "Datacenter ->
Options -> Bandwidth Limits" and then retry cloning operation ?

>>kernel: blk_update_request: I/O error, dev sdb, sector 1762240503 op
0x9:(WRITE_ZEROES) flags 0x0 phys_seg 0 prio class 0

Is this on the storage server or the PVE host ? What does /dev/sdb
represent in this case ? if it's a hard drive, it looks like it's having
some hw issues ? Better to test with smartctl if that's the case.


On Tue, 11 Aug 2020 at 08:59, Amin Vakil via pve-user <
pve-user at lists.proxmox.com> wrote:

> ---------- Forwarded message ----------
> From: Amin Vakil <info at aminvakil.com>
> To: pve-user at lists.proxmox.com
> Cc:
> Bcc:
> Date: Tue, 11 Aug 2020 12:20:20 +0430
> Subject: LVM over ISCSI issue
> Hello
> I'm facing issues with lvm over iscsi sometimes.
> There is a nas and I have created a nfs directory and an iscsi and I've
> attached them both to my proxmoxs.
> NFS is fine and data will be copied on it.
> but iscsi faces issue sometimes and I can't migrate vm's disk to it
> Although it's up and running, there are vms which disks are already on
> iscsi and works without problem
> error: http://ix.io/2tRq
> Also in journalctl I'm seeing this error: http://ix.io/2tRr
> As I've mentioned there are vms which are already running on iscsi, I've
> even shut them down, disable iscsi, enable iscsi and start them again
> and they're ok.
> Also `iscsiadm -m session -P 2` shows me that the proxmox is logged in.
> Any idea?
> ---------- Forwarded message ----------
> From: Amin Vakil via pve-user <pve-user at lists.proxmox.com>
> To: pve-user at lists.proxmox.com
> Cc: Amin Vakil <info at aminvakil.com>
> Bcc:
> Date: Tue, 11 Aug 2020 12:20:20 +0430
> Subject: [PVE-User] LVM over ISCSI issue
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