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How to check speed of SCSI HDD in RH 9

Go to solution
Frequent Advisor

How to check speed of SCSI HDD in RH 9

Hi All,

What is the command to check the speed of the SCSI HDD in Redhat 9 ?

On ML110 server, there is a U320 SCSI HDD. It is reported in BIOS as 80MB SCSI speed instead of 320MB.

But this seems normal as per the link below**&p_li

Any help appreciated,

Steven E. Protter
Exalted Contributor

Re: How to check speed of SCSI HDD in RH 9

I wouldn't necessarily trust what the bios is saying.

I'd think about a utility like dd and see how long it takes to write a very big file.

Do remember that writes are going to take longer than reads.

You might try transferring a large file with a script from one filesystem on the disk to another with a echo statement before and after the transfer.

Don't except 320 MB/s speeds in any case. Thats a theoretical standard that is slowed down by factors such as overhead.

I'm not sure I'd worry a whole lot about what the BIOS says.

If you are willing to take the server down, most servers come with a bootable diagnostic disk. You can boot off that and run the disk speed check utilities to allay your concerns.

A diagnostic cd/program is available for download from the website of the manufacturer as well.

Steven E Protter
Owner of ISN Corporation
Andrew Cowan
Honored Contributor

Re: How to check speed of SCSI HDD in RH 9

You can get the Adaptec EZ-SCSI utilities to tune the performance of the drive and card, unfortunately I think there only available for Windows so you may need to make your machine dual boot. I found using EZ-SCSI I could turn on features such as write-caching and that greatly improved performance.

You could also try pressing CTRL-A during boot and checking that the card's BIOS is set to the maximum speed.
Stuart Browne
Honored Contributor

Re: How to check speed of SCSI HDD in RH 9

*whee!* I can post to the thread now! Yay!..

Anyway, what I was goign to say last week was to check your '/var/log/dmesg' file. All SCSI HDD's usually list the interface speed they are running at there, i.e.:

scsi0:A:0:0: Tagged Queuing enabled. Depth 253
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT, offset 63, 16bit)
SCSI device sda: 71132000 512-byte hdwr sectors (36420 MB)
One long-haired git at your service...