On 12/20/10 2:52 PM, Tim Evans wrote:
> On 12/20/10 13:02, Brian Long wrote:
>
>> We'd like to see the output of /proc/mounts to help you with the
>> problem. "The defaults" is not good enough because they are negotiated.
>> When you don't specify mount options, they're not necessarily going to
>> be the most optimal. It depends on the kernel versions on both client
>> and server. Most newer clients (depending on the server) will default
>> to TCP, 64K rsize and wsize.
>
> N7700:/raid0/data/backups /backups nfs
> rw,vers=3,rsize=32768,wsize=32768,hard,proto=udp,timeo=11,retrans=2,sec=sys,addr=N7700
> 0 0
>
> As I mentioned to James Pearson (but might not've cc'd the list), I am
> beginning to think this may not be an NFS issue at all, but rather an
> i/o problem with RHEL's LVM.
If you mean the local disk which you are trying to backup, why not try
to dump to another local disk and take the NAS out of the picture? If
/var/tmp is big enough, try dump'ing a small local partition (or
subdirectory) to /var/tmp and see if it's still getting 500KB/sec.
A way to take dump out of the picture would be to run "dd" from
/dev/zero to your NAS and see what the throughput looks like. For
example, dd if=/dev/zero of=/backups/foo bs=2m count=250. This should
write ~500MB to your NAS and not touch your local disk.
/Brian/
--
Brian Long | |
Corporate Security Programs Org . | | | . | | | .
' '
C I S C O
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