[Gluster-users] VMs blocked for more than 120 seconds

[Martin Toth]

Hi,

there is no healing operation, not peer disconnects, no readonly filesystem. Yes, storage is slow and unavailable for 120 seconds, but why, its SSD with 10G, performance is good.

> you'd have it's log on qemu's standard output,

If you mean /var/log/libvirt/qemu/vm.log there is nothing. I am looking for problem for more than month, tried everything. Can’t find anything. Any more clues or leads?

BR,
Martin

> On 13 May 2019, at 08:55, lemonnierk at ulrar.net wrote:
> 
> On Mon, May 13, 2019 at 08:47:45AM +0200, Martin Toth wrote:
>> Hi all,
> 
> Hi
> 
>> 
>> I am running replica 3 on SSDs with 10G networking, everything works OK but VMs stored in Gluster volume occasionally freeze with “Task XY blocked for more than 120 seconds”.
>> Only solution is to poweroff (hard) VM and than boot it up again. I am unable to SSH and also login with console, its stuck probably on some disk operation. No error/warning logs or messages are store in VMs logs.
>> 
> 
> As far as I know this should be unrelated, I get this during heals
> without any freezes, it just means the storage is slow I think.
> 
>> KVM/Libvirt(qemu) using libgfapi and fuse mount to access VM disks on replica volume. Can someone advice  how to debug this problem or what can cause these issues? 
>> It’s really annoying, I’ve tried to google everything but nothing came up. I’ve tried changing virtio-scsi-pci to virtio-blk-pci disk drivers, but its not related.
>> 
> 
> Any chance your gluster goes readonly ? Have you checked your gluster
> logs to see if maybe they lose each other some times ?
> /var/log/glusterfs
> 
> For libgfapi accesses you'd have it's log on qemu's standard output,
> that might contain the actual error at the time of the freez.
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