[jira] [Created] (CLOUDSTACK-3776) System VMs should mount their filesystem with noatime and sync

["Wido den Hollander (JIRA)" <ji...@apache.org>]

Wido den Hollander created CLOUDSTACK-3776:
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             Summary: System VMs should mount their filesystem with noatime and sync
                 Key: CLOUDSTACK-3776
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3776
             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
             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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