> Steve Lord wrote:
> >
> <...>
> > An external log should
> > go faster, on the delete end though, there is a synchronous write to the
> > log in there, so the number of ops per second your journal device can
> > do is important for delete performance.
>
> Hello,
>
> Updated data with e) /dev/md0 raid5 xfs with an external log
> on /dev/md4 (a 128MB raid1 array on hda and hdc) and f) over nfs.
> Everything being the same as in the previous mails.
>
> > How long does it take to extract the 2.4.6 linux kernel and delete it?
> >
> > | create | delete
> > -------------------
> > a) | 0:17 | 0:07
> > b) | 0:24 | 0:25
> > c) | 1:51' | 16:45
> > d) | 2:54 | 8:08
> ---------------------
> e) | 0:10 | 0:02 to be compared with c)
> f) | 0:41 | 0:23 to be compared with d)
These numbers look a lot better - clearly the log on raid5 is not operating
well at all. Can you tell me if you have any problems with unmounting and
remounting the filesystem with the external log? This will let us narrow
down the log problems to raid5 - which I expect to be the only case with
this problem.
Thanks
Steve
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