Disk striping performance

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2 total messages Started by Shawn Young Fri, 22 Jan 1993 22:42

#257

Author: Shawn Young
Date: Fri, 22 Jan 1993 22:42

27 lines
1673 bytes

Hi people,

I was wondering if anyone had any I/O benchmark results for striped disk sets on
SGI boxes, either for just the striped disks, or relative to single disk
partitions. I'm looking for something that'll give me an idea of maximum and 
expected real-world throughput, and a relative measure of increase/decrease in
performance with respect to individual disks.

Also, I know that the maximum partition size is 8GB, but what happens if I want 
two partitions: one consisting of 5 1.6GB striped disks, and the other consisting 
of 4 of the same. Is there any problem with this? What performance penalties, if 
any, are there?

Thanks in anticipation,

Shawn
--
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Shawn Young          | MacDonald Dettwiler    | "The wages of sin may well be
Phone:  604-278-3411 | 13800 Commerce Parkway |  death; but after taxes, it's 
Fax:    604-278-2936 | Richmond, B.C., Canada |  probably just a really tired
Email:  young@mda.ca | V6V 2J3                |  feeling." - A comedienne who's
        !uunet!van-bc!mdavcr!young            |  name I cannot recall
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* 	The opinions stated herein are not necessarily those of my employer or 
	any other group of reasonably sane individuals.
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Re: Disk striping performance

#263

Author: Dave Olson
Date: Sat, 23 Jan 1993 19:49

24 lines
1843 bytes

In <3980@mutt.mdavcr.mda.ca> young@mdavcr.mda.ca (Shawn Young) writes:
| I was wondering if anyone had any I/O benchmark results for striped disk sets on
| SGI boxes, either for just the striped disks, or relative to single disk
| partitions. I'm looking for something that'll give me an idea of maximum and 
| expected real-world throughput, and a relative measure of increase/decrease in
| performance with respect to individual disks.

Yes, we have them, but there are way too many variables to give you
an answer with the info you have provided.  The numbers depend a
great deal on machine type, and raw vs filesystem, controllers used,
usage patterns, etc. etc.

| Also, I know that the maximum partition size is 8GB, but what happens if I want 
| two partitions: one consisting of 5 1.6GB striped disks, and the other consisting 
| of 4 of the same. Is there any problem with this? What performance penalties, if 
| any, are there?

No problems, no performance penalties per se.  You are likely to be
above the bandwidth of the controllers, so you may get more SCSI
bus contention, or even system bus on some machines.
--
Let no one tell me that silence gives consent,  |   Dave Olson
because whoever is silent dissents.             |   Silicon Graphics, Inc.
    Maria Isabel Barreno                        |   olson@sgi.com

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