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From "Wido den Hollander (JIRA)" <>
Subject [jira] [Updated] (CLOUDSTACK-3776) System VMs should mount their filesystem with noatime and sync
Date Wed, 24 Jul 2013 09:29:48 GMT


Wido den Hollander updated CLOUDSTACK-3776:

    Assignee: Wido den Hollander
> System VMs should mount their filesystem with noatime and sync
> --------------------------------------------------------------
>                 Key: CLOUDSTACK-3776
>                 URL:
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: SystemVM
>    Affects Versions: 4.1.0
>            Reporter: Wido den Hollander
>            Assignee: Wido den Hollander
>             Fix For: 4.2.0
> Currently the System VMs mount their filesystem with the default mount options, which
is rw,async.
> To improve their stability I recommend that we mount their root filesystem with: rw,sync,noatime
> This will bring their I/O performance down by a bit, but that doesn't matter that much.
It will however make the FS more robust after a hypervisor crash.
> Noatime is just to prevent writes on reads and will improve performance by a fraction.
> I have seen a lot of ext3 filesystems go corrupt inside SSVMs under KVM and rebuilding
them can take some time.

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