[K12OSN] new server serial ATA or SCSI - results on new 3ware card

Chris Kacoroski ckacoroski at nsd.org
Fri Feb 27 20:14:00 UTC 2004


They are standard Western Digital 7200 RPM SATA drives (250GB each).  I 
have not had a change to test the system with the 10K WD raptors yet 
(next week).

cheers,

ski

On Feb 27, 2004, at 5:04 PM, Ken Meyer wrote:

> Ski --
>
> What SATA drives?
>
> Ken Meyer
>
>
> ----- Original Message -----
>
> From: Chris Kacoroski <ckacoroski at nsd.org>
> To: <k12osn at redhat.com>
> Sent: Friday, February 27, 2004 4:29 PM
>
> Subject: Re: [K12OSN] new server serial ATA or SCSI - results on new 
> 3ware
> card
>
>
>> Hi,
>>
>> I got my new system with the following specs:
>
>> - 3ware controller #1 with (2) sata drives in mirrored config as 
>> system
>> disk
>
>> - 3ware controller #2 with (9) sata drives in raid 5 split into 2 
>> 912GB
>> partitions (sdb1 & sdb2)
>
>> - Redhat AS3 with all the patches (2.4.21-9.0.1.ELsmp kernel)
>
>> - Dual Xeon 2.4Ghz cpus with hyperthreading so they look like four
>> processors
>>
>> and the results I get with hdparm -tT when run individually are:
>>
>> /dev/sdb2:
>
>>   Timing buffer-cache reads: 2440 MB in 2.00 seconds = 1220 MB/sec
>>   Timing buffered disk reads: 132 MB in 3.01 seconds = 43.85 MB/sec
>>
>> /dev/sdb1:
>
>>   Timing buffer-cache reads: 2436 MB in 2.00 seconds = 1218 MB/sec
>>   Timing buffered disk reads: 132 MB in 3.03 seconds = 43.56 MB/sec
>>
>> /dev/vg00/lvRoot:
>
>>   Timing buffer-cache reads: 2228 MB in 2.00 seconds = 1214 MB/sec
>>   Timing buffered disk reads: 110 MB in 3.03 seconds = 36.30 MB/sec
>>
>> when I run them at the same time, the results drop to:
>>
>> /dev/sdb2:
>
>>   Timing buffer-cache reads: 1760 MB in 2.00 seconds = 880 MB/sec
>>   Timing buffered disk reads: 102 MB in 3.14 seconds = 31.19 MB/sec
>>
>> /dev/sdb1:
>
>>   Timing buffer-cache reads: 1780 MB in 2.00 seconds = 890 MB/sec
>>   Timing buffered disk reads: 98 MB in 3.03 seconds = 32.34 MB/sec
>>
>> /dev/vg00/lvRoot:
>>   Timing buffer-cache reads: 1200 MB in 2.00 seconds = 600 MB/sec
>>   Timing buffered disk reads: 108 MB in 3.00 seconds = 36.00 MB/sec
>>
>> To me the interesting thing is that the system partition also slows
>> down even though it is on a separate 3ware card.  I plan to do some
>> more extensive testing next week, but initially it looks like it will
>> keep up with a scsi based system.
>>
>> --
>> "When we try to pick out anything by itself, we find it
>>    connected to the entire universe" John Muir
>>
>> Chris "Ski" Kacoroski, ckacoroski at nsd.org, 425-489-6263
>
>
>
>
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