[CentOS] Re: DRBD NFS load issues
Jed Reynolds
lists at bitratchet.com
Mon Jan 7 16:07:36 UTC 2008
Ugo Bellavance wrote:
> Jed Reynolds wrote:
>> Jed Reynolds wrote:
>>> Ugo Bellavance wrote:
>>>
>>>>
>>>> Can you send us the output of vmstat -n 5 5
>>>> when you're doing a backup?
>>>>
>>>
>>> This is with rsync at bwlimit=2500
>>>
>>
>> This is doing the same transfer with SSH. The load still climbs...and
>> then load drops. I think NFS is the issue.
>>
>> I wonder if my NFS connection settings in client fstabs are unwise? I
>> figured with beefy machine and fast networking, I could take
>> advantage of large packetsizes. Bad packet sizes?
>
>
> Are you backing up nfs to nfs? From where to where are you doing
> backups?
The source data is on a ext3 partition, LVM volume, backed by a 15krpm
raid 10 volume. Both rsyncs where conducted from the source host (the db
server) to the backup server (which hosts nfs). In the nfs backup, I was
rsyncing from the db filesystem to an NFS mount, and the ssh backup, I
was rsyncing from the db filesystem to sshuser at backupserver:/backups.
Jed
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