Date: Thu, 30 Aug 2007 21:44:18 +1000 From: Edwin Groothuis <edwin@mavetju.org> To: Paulius Stakauskas <paulius.stakauskas@agservice.lt> Cc: freebsd-proliant@freebsd.org Subject: Re: HP ProLiant DL385 G2 Server Message-ID: <20070830114418.GO1382@k7.mavetju> In-Reply-To: <46D660D0.3020804@agservice.lt> References: <46D660D0.3020804@agservice.lt>
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On Thu, Aug 30, 2007 at 09:16:48AM +0300, Paulius Stakauskas wrote:
> Hi,
>
> I'm running FreeBSD 6.2-RELEASE on this server.
>
> # dmesg|grep ciss
> ciss0: <HP Smart Array P400> port 0x4000-0x40ff mem
> 0xfde00000-0xfdefffff,0xfddf0000-0xfddf0fff irq 18 at device 0.0 on pci6
> ciss0: [GIANT-LOCKED]
> da0 at ciss0 bus 0 target 0 lun 0
> da1 at ciss0 bus 0 target 1 lun 0
>
> # camcontrol devlist -v
> scbus0 on ciss0 bus 0:
> <COMPAQ RAID 1 VOLUME OK> at scbus0 target 0 lun 0 (pass0,da0)
> <COMPAQ RAID 5 VOLUME OK> at scbus0 target 1 lun 0 (pass1,da1)
> scbus1 on ciss0 bus 32:
> scbus-1 on xpt0 bus 0:
> < > at scbus-1 target -1 lun -1 (xpt0)
>
> For first everything seems to be fine, but the problem is while copying
> files from da0 to da1, take a look at the statistics:
>
> File: 635 MB
>
> copy from da0 to da1 = 58sec.
> copy from da1 to da0 = ~9sec.
>
> Is this normal or not? I know that it's RAID-5 but.., I think it takes
> too long to copy from da0 to da1.
That's indeed what I had too: (a posting from an internal mailinglist
at february 2006)
On a RAID0 disk, 16384 blocks of 16384 bytes:
[~] root@cleo>dd if=/dev/zero of=/mnt/foo bs=16384 count=16384
16384+0 records in
16384+0 records out
268435456 bytes transferred in 2.167275 secs (123858514 bytes/sec)
On a RAID1 disk, 16384 blocks of 16384 bytes:
[~] root@janus>dd if=/dev/zero of=/usr/foo bs=16384 count=16384
16384+0 records in
16384+0 records out
268435456 bytes transferred in 4.020692 secs (66763495 bytes/sec)
On a RAID5 disk, 16384 blocks of 16384 bytes:
[~] root@janus>dd if=/dev/zero of=/mnt/databases/foo bs=16384 count=16384
16384+0 records in
16384+0 records out
268435456 bytes transferred in 20.688034 secs (12975397 bytes/sec)
On a RAID5 disk, 16384 blocks of 16384 bytes:
[~] root@cleo>dd if=/dev/zero of=/usr/foo bs=16384 count=16384
16384+0 records in
16384+0 records out
268435456 bytes transferred in 17.556463 secs (15289837 bytes/sec)
RAID0: 2.2 secs
RAID1: 4.0 secs
RAID5: 17.6 / 20.7 secs
A little bit bigger: 65535 64K byte blocks: (yes that's 16x)
RAID0:
[~] root@cleo>dd if=/dev/zero of=/mnt/foo bs=64k count=65535
65535+0 records in
65535+0 records out
4294901760 bytes transferred in 35.805593 secs (119950583 bytes/sec)
RAID1:
[~] root@janus>dd if=/dev/zero of=/usr/foo bs=64k count=65535
65535+0 records in
65535+0 records out
4294901760 bytes transferred in 68.338178 secs (62847765 bytes/sec)
RAID5:
[~] root@janus>dd if=/dev/zero of=/mnt/databases/foo bs=64k count=65535
65535+0 records in
65535+0 records out
4294901760 bytes transferred in 337.764817 secs (12715658 bytes/sec)
[~] root@cleo>dd if=/dev/zero of=/usr/foo bs=64k count=65535
65535+0 records in
65535+0 records out
4294901760 bytes transferred in 271.828036 secs (15800069 bytes/sec)
RAID0: 35.8 secs
RAID1: 68 secs
RAID5: 271 / 337 secs
At the end we just throw our databases on RAID1 partitions
Edwin
--
Edwin Groothuis | Personal website: http://www.mavetju.org
edwin@mavetju.org | Weblog: http://www.mavetju.org/weblog/
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