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From Andrei Mikhailovsky <and...@arhont.com.INVALID>
Subject Re: Concurrent Volume Snapshots
Date Thu, 13 Jun 2019 13:24:07 GMT
Hi Rohit,

I have updated some of those options to increase the timeout to 2 days rather than a few hours
by default.

However, these options relate to the timeout of the process.

I was wondering if there is an option to allow simultaneous snapshotting of volumes on a single
VM? I would like all volumes of the vm to be copied over to the secondary storage at the same
time, rather than one after another.

Cheers

----- Original Message -----
> From: "Rohit Yadav" <rohit.yadav@shapeblue.com>
> To: "dev" <dev@cloudstack.apache.org>
> Sent: Thursday, 13 June, 2019 14:02:21
> Subject: Re: Concurrent Volume Snapshots

> You can try to experiment with the following global settings:
> 
> 
> wait
> 
> backup.snapshot.wait
> copy.volume.wait
> vm.job.lock.timeout
> 
> 
> Regards,
> 
> Rohit Yadav
> 
> Software Architect, ShapeBlue
> 
> https://www.shapeblue.com
> 
> ________________________________
> From: Andrei Mikhailovsky <andrei@arhont.com.INVALID>
> Sent: Thursday, June 13, 2019 6:27:23 PM
> To: dev
> Subject: Concurrent Volume Snapshots
> 
> Hello everyone
> 
> I am having running snapshot issues on large volumes. The hypervisor is KVM and
> the storage backend is Ceph (rbd). ACS version is 4.11.2. Here is my issue:
> 
> I've got several vms with 3-6 volumes of 2TB each. I have a recurring schedule
> setup to take a snapshot of each volume once a month. It takes a long time for
> a volume to be snapshotted (in a magnitude of 20 hours). As a result, when the
> schedule kicks in, it only manages to snapshot the first volume and the
> snapshots of the other volumes fail due to the async job timeout. From what I
> have discovered, ACS only does a single volume snapshot at a time. I can't seem
> to find the settings to enable concurrent snapshotting. So, it can't snapshot
> all of the vm volumes at the same time. This is very much problematic for many
> reasons, but the main reason is that upon recovery of multiple volumes, the
> data on those will not be consistent.
> 
> Is there a way around it? Perhaps there is an option in the settings that I
> can't find that disables this odd behaviour of the volume snapshots?
> 
> Cheers
> 
> Andrei
> 
> rohit.yadav@shapeblue.com
> www.shapeblue.com
> Amadeus House, Floral Street, London  WC2E 9DPUK
> @shapeblue

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