[CentOS] Re: DRBD NFS load issues
Ugo Bellavance
ugob at lubik.ca
Mon Jan 7 16:42:56 UTC 2008
Jed Reynolds wrote:
> 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
Ok, so the DB is residing locally on the local server you are copying
onto the nfs mount only during backup?
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