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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/24692/
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Review request for cloudstack, daan Hoogland, Joris van Lieshout, and Sanjay
Tripathi.
Bugs: CLOUDSTACK-7345
https://issues.apache.org/jira/browse/CLOUDSTACK-7345
Repository: cloudstack-git
Description
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CLOUDSTACK-7345 patch to change dd command from 4M to 128k when using NFS
Diffs
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scripts/vm/hypervisor/xenserver/vmopsSnapshot 85444dc
Diff: https://reviews.apache.org/r/24692/diff/
Testing
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Starting multiple dd commands with bs=4M on a single hypervisor causes nfs
server timed out messages in /var/log/kern.log and causes the dd process to
crash.
With bs=4M NFS debugging shows 64 seperate 64k reads are done, after which the
inode is updated 64 times (access time) and 32 128k writes are done to
secondary storage.
NFS debugging showed the 'nfs server timed out' messages usually occured during
the 64 inode updates (of the same file) from the read process.
Running multiple dd commands with bs=128k on a single hypervisor does not cause
nfs server timed out messages in /var/log/kern.log.
With bs=128k NFS debugging shows 2 seperate 64k reads are done (and indoe
updates) and 1 128k write is done.
We are running this change in production. The nfs server timed out messages are
gone and not a single snapshot process has broken (previosuly this happened
every night).
Thanks,
Brenn Oosterbaan
