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From "Brenn Oosterbaan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CLOUDSTACK-7345) Copy snapshot command can cause NFS timeouts, breaking the snapshot process.
Date Thu, 14 Aug 2014 09:24:12 GMT

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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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