[OpenAFS-devel] Vos dump "performance"

[Hans-Werner Paulsen]

This is very slow. But, is it possible that your tar command is too clever?
On a 85GiB volume with 370000 files I see the following:
# date; tar -c -f - . | cat >/dev/null; date
Wed May 13 13:44:29 CEST 2015
Wed May 13 13:59:48 CEST 2015
# date; tar -c -f /dev/null . ; date
Wed May 13 14:00:16 CEST 2015
Wed May 13 14:00:20 CEST 2015
# date; vos dump -id 536978585 -time 0 -localauth >/dev/null; date
Wed May 13 14:02:23 CEST 2015
Dumped volume 536978585 in stdout
Wed May 13 14:27:31 CEST 2015

HW

On 05/12/2015 02:43 PM, Harald Barth wrote:
> I have some serious case of "vos dump slowness" here (on localhost)
>
> gourami# date ; vos dump -id 537086828 -time 0 -localauth > /dev/null ; date
> Tue May 12 11:40:00 CEST 2015
> Dumped volume 537086828 in stdout
> Tue May 12 14:04:00 CEST 2015
>
> I can compare to "tar" over the same data:
>
> gourami# cd /vicepa/AFSIDat/e=/eho+U
> gourami# date ; tar cf /dev/null . ; date
> Tue May 12 11:18:06 CEST 2015
> Tue May 12 11:22:36 CEST 2015
>
> Ok, vos dump is doing a little more than tar, but has anyone any idea
> in what corner to dig after this? Probably it has to do with that the
> volume has many files (in relative few directories).
>
> $ vos exa 537086828 -c pdc.kth.se -ext
> common.var.easy.a-pop.backup      537086828 BK    5084378 K used 2367409 files On-line
>
> Harald.
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