David Rees wrote:
> Let's start at the beginning:
>
> On 3/26/07, Evren Yurtesen <[EMAIL PROTECTED]> wrote:
>> I am using backuppc but it is extremely slow. I narrowed it down to disk
>> bottleneck. (ad2 being the backup disk). Also checked the archives of
>> the mailing list and it is mentioned that this is happening because of
>> too many hard links.
>>
>> Disks ad0 ad2
>> KB/t 4.00 25.50
>> tps 1 75
>> MB/s 0.00 1.87
>> % busy 1 96
>
> What OS are you runnnig? What filesystem? What backup method
> (ssh+rsync, rsyncd, smb, tar, etc)?
>
> 75 tps seems to be a bit slow for a single disk. Do you have vmstat,
> iostat and/or top output while a backup is running?
Well, 1.7MB/s random reads is not that bad really.
There are 4 hosts that have been backed up, for a total of:
>vmstat
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr ad0 ad2 in sy cs us
sy id
1 10 0 144448 14124 112 0 1 1 245 280 0 0 438 361 192
6 3 91
>iostat
tty ad0 ad2 cpu
tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id
0 2 11.39 3 0.04 9.52 59 0.54 6 0 3 0 91
>> But I couldnt find any solution to this. Is there a way to get this
>> faster without changing to faster disks? I guess I could 2 disks in
>> mirror or something but it is stupid to waste the space I gain by
>> backuppc algorithm by using multiple disks to get a decent performance :)
>
> A mirror will only help speed up random reads at best. This usually
> isn't a problem for actual backups, but will help speed up the nightly
> maintenance runs.
>
> -Dave
>
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