On Wed, 2002-08-14 at 10:12, Simon Matter wrote:
> Paul Schutte schrieb:
> >
> > Seth Mos wrote:
> >
> > > At 12:31 14-8-2002 +0200, Paul Schutte wrote:
> > > >Background:
> > > >----------------
> > > >
> > > >I ran a ftp server on a pentium II 333Mhz with 256M RAM, using the
> > > >2.4.9-31-xfs kernel.
> > > >Used 4 x 120 Gb IDE drives in a RAID 5 array on an Adaptec 2400 hardware
> > > >raid controller.
> > > >There is a 4Gb root partition and a +/- 320Gb data partition.
> > > >
> > > >One of the drives failed and the machine crashed.
> > >
> > > Adaptec is not known for there quality of the raid drivers. aacraid comes
> > > to mind. I suggest using software raid instead. I like software raid.
> > >
> >
> > software RAID5 with internal log using postmark v1.5
> > Time:
> > 6186 seconds total
> > 5840 seconds of transactions (17 per second)
> >
> > Files:
> > 60125 created (9 per second)
> > Creation alone: 10000 files (121 per second)
> > Mixed with transactions: 50125 files (8 per second)
> > 50110 read (8 per second)
> > 49822 appended (8 per second)
> > 60125 deleted (9 per second)
> > Deletion alone: 10250 files (38 per second)
> > Mixed with transactions: 49875 files (8 per second)
> >
> > Data:
> > 3113.25 megabytes read (515.35 kilobytes per second)
> > 3731.11 megabytes written (617.63 kilobytes per second)
> >
> > hardware raid5 using postmark v1.5:
> > Time:
> > 749 seconds total
> > 709 seconds of transactions (141 per second)
> >
> > Files:
> > 60125 created (80 per second)
> > Creation alone: 10000 files (416 per second)
> > Mixed with transactions: 50125 files (70 per second)
> > 50110 read (70 per second)
> > 49822 appended (70 per second)
> > 60125 deleted (80 per second)
> > Deletion alone: 10250 files (640 per second)
> > Mixed with transactions: 49875 files (70 per second)
> >
> > Data:
> > 3113.25 megabytes read (4.16 megabytes per second)
> > 3731.11 megabytes written (4.98 megabytes per second)
>
> Hmm, tell me if I'm wrong but I'm quite sure you were using software
> RAID5 with internal log. Use external log with this kernel
> (2.4.9-31-xfs) and you'll see a big difference! I'm running 2.4.9-34-xfs
> on software RAID5 on a DELL server with hardware RAID.
>
> Simon
>
So have any of you folks tried V2 logs with striping on a software raid,
it should fix the performance there.
Steve
--
Steve Lord voice: +1-651-683-3511
Principal Engineer, Filesystem Software email: lord@xxxxxxx
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