Re: Interesting speed benchmarks

Peter Jeremy wrote:
> On Wed, 2007-Jan-31 07:54:24 +0200, Ian FREISLICH wrote:
>> As a random datapoint that might or might not be related.  In the
>> last year or so I was pontificating about how much better SCSI was
>> that IDE/ATA to my boss.  I then did some benchmarks on my (CURRENT)
>> system and discovered that an old 10Gig 7.5krpm UDMA33 disk
>> significantly out perform some Seagate Cheatah LVD 10krpm disks.
> 
> I have access to a Sun V20z at work:
> mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x2000-0x20ff mem 0xfe850000-0xfe85ffff,0xfe840000-0xfe84ffff irq 27 at device 4.0 on pci2
> mpt0: [GIANT-LOCKED]
> mpt0: MPI Version=1.2.15.0
> mpt0: Capabilities: ( RAID-1E RAID-1 SAFTE )
> mpt0: 0 Active Volumes (1 Max)
> mpt0: 0 Hidden Drive Members (6 Max)
> da0 at mpt0 bus 0 target 0 lun 0
> da0: <FUJITSU MAW3073NC 0103> Fixed Direct Access SCSI-3 device 
> da0: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
> da0: 70136MB (143638992 512 byte sectors: 255H 63S/T 8941C)
> da1 at mpt0 bus 0 target 1 lun 0
> da1: <FUJITSU MAW3073NC 0103> Fixed Direct Access SCSI-3 device 
> da1: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
> da1: 70136MB (143638992 512 byte sectors: 255H 63S/T 8941C)
> 
> Whilst the drives are geom mirrored, running in "prefer" mode forces
> all reads to come off the first drive (iostat/systat verify this) and
> I get:
> # df -ki /home
> Filesystem         1K-blocks      Used    Avail Capacity iused     ifree %iused  Mounted on
> /dev/mirror/gm0s1f  38999124  13440472 22438724    37%  273895   4766231    5%   /home
> # dump -0aL -f /dev/null -C 32 /home
>   DUMP: DUMP: 13671011 tape blocks on 1 volume
>   DUMP: finished in 906 seconds, throughput 15089 KBytes/sec
> 
> Note that I've only just mirrored this system that everything has been
> very recently restored which might give an optimistic result but this
> is still way above what I'm seeing on my ATA system at home or what
> Robert is seeing.
> 

Not sure if this will be helpful or not, but on a 4xATA-133 disk 3ware 
RAID 0 system (running STABLE) I get this:

# dump -0aL -f /dev/null -C 32 /home
   DUMP: DUMP: 12704177 tape blocks on 1 volume
   DUMP: finished in 628 seconds, throughput 20229 KBytes/sec

While the dump is happening iostat shows:

device     r/s   w/s    kr/s    kw/s wait svc_t  %b
twed0    1113.2   0.2 71230.9     6.4    2   1.6  86

So looks like we are working the filesystem pretty hard...

Cheers

Mark