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https://issues.apache.org/jira/browse/CLOUDSTACK-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brenn Oosterbaan reassigned CLOUDSTACK-7345:
--------------------------------------------
Assignee: Brenn Oosterbaan
> Copy snapshot command can cause NFS timeouts, breaking the snapshot process.
> ----------------------------------------------------------------------------
>
> Key: CLOUDSTACK-7345
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-7345
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Snapshot, XenServer
> Affects Versions: 4.0.0, 4.0.1, 4.0.2, 4.1.0, 4.2.0
> Reporter: Brenn Oosterbaan
> Assignee: Brenn Oosterbaan
> Fix For: 4.4.0
>
>
> When multiple snapshots are being transferred from NFS primary to secondary
> storage at the same time, NFS timeouts on the primary storage can occur.
> This then breaks most of the snapshot processes, resulting in corrupted (half
> completed) snapshots.
> The DD command used uses 'bs=4M', which is then chopped into 64 64k reads
> since the primary storage is mounted with a blocksize of 64k, and written to
> the secondary storage as 32 128k blocks (since secondary is mounted with
> blocksize 128k).
> We created a patch changing the DD command to use 'bs=128k' (unless iSCSI is
> used in which case it stays at bs=4M).
> Snapshot processes no longer break, and no negative performance impact.
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