Just out of curiosity, can you temporarily disable discard support on the target VM disk to see if that will make a difference?
On Tue, 11 Aug 2020 at 11:52, Amin Vakil via pve-user < [email protected]> wrote: > > > > ---------- Forwarded message ---------- > From: Amin Vakil <[email protected]> > To: [email protected] > Cc: > Bcc: > Date: Tue, 11 Aug 2020 15:22:02 +0430 > Subject: [PVE-User] LVM over ISCSI issue > Sorry, I just realized I've send my previous email with wrong subject. > > > 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 ? > > > > I cloned to nfs to make sure it's ok, it doesn't make any difference > when cloning from local or nfs to iscsi. the problem is the same, here > is the log cloning from local to iscsi: http://ix.io/2tRX > > Also sometimes it errors in the middle of cloning process: > http://ix.io/2tRV > > Creating a vm and adding a disk on iscsi to an existing vm is fine. > > I have set bandwidth limits and it didn't make any difference. > > >>> 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. > > The storage server is a qnap NAS, and it's health and smart is > constantly monitored. Of course faulty hardware can never be ruled out > completely, but I doubt that would be the case, because qnap smart > status and hard health is ok and none of the running VMs on iscsi are > facing any issue. > > fdisk -l: > ... > Disk /dev/sdb: 3.9 TiB, 4294967296000 bytes, 8388608000 sectors > Disk model: iSCSI Storage > ... > > iscsiadm -m session -P 2: > http://ix.io/2tRY (ip address and username have been changed, everything > else are unchanged) > > Although I have cloned to iscsi now, but it succeed after trying many > times, the error seems to be random. > > Also if it helps someone on ##proxmox IRC told me this: > it basically fails at the sparse scsi command > WRITE_ZEROES > that is _usually_ an array issue > > > > > > > ---------- Forwarded message ---------- > From: Amin Vakil via pve-user <[email protected]> > To: [email protected] > Cc: Amin Vakil <[email protected]> > Bcc: > Date: Tue, 11 Aug 2020 15:22:02 +0430 > Subject: [PVE-User] LVM over ISCSI issue > _______________________________________________ > pve-user mailing list > [email protected] > https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user > -- Sent from Gmail Mobile _______________________________________________ pve-user mailing list [email protected] https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user
