DUMP is slow? (5.2.1)

[Greg 'groggy' Lehey]

On Wednesday,  7 April 2004 at 16:24:17 -0500, J.D. Bronson wrote:
> I am dumping about 284MB...
>
> Now here is what I did...
>
> 1. identical drives on the same Adaptec 29160 controller
> 2. Each drive is sliced and formatted the same
> 3. I ran 'tunefs -n enable'
> 4. Mounted drive 2 as /mntg
>
>
> Then as root do this:
> # dump -C 32 -0Lf - /home | ( cd /mntg ; restore xf - )
>   DUMP: Date of this level 0 dump: Wed Apr  7 16:17:13 2004
> ..
>   DUMP: finished in 45 seconds, throughput 6288 KBytes/sec
>
> ..that seems a bit slow for SCSI....

You're creating a whole lot of files in the process.  Without the
restore it would probably be faster.

> # ufsdump -0f - /export/home | ( cd /mnt6 ; ufsrestore xf - )
> ...
>   DUMP: 571006 blocks (278.81MB) on 1 volume at 22362 KB/sec
>
> That speed seems more reasonable.
>
> Is there any reason that the FreeBSD machine is so much slower?

Different hardware, I would imagine.

Greg
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