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[ccp4bb] raid array load comments
 

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CCP4bb <-- 2008 <-- January 2008 <-- 15 January 2008
Previous message:
Subject: wich program to test an alternative phaser solution
From: Vellieux frederic {- dot -} vellieux {- at -} IBS {- dot -} FR
Date: 2008-01-15 		Next message:
Subject: Re: wich program to test an alternative phaser solution
From: Eleanor Dodson ccp4 {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
Date: 2008-01-15


Subject: raid array load comments
From: "Harry M {- dot -} Greenblatt" Harry {- dot -} Greenblatt {- at -} WEIZMANN {- dot -} AC {- dot -} IL
Date: 2008-01-15
BS"D

Thank you to all the respondents.

Some comments:

1. Some believe that the write performance in RAID 5 is only as good
as performance to one disk. This is true only in RAID 3 (under
certain conditions), where parity is written as a separate operation
to one dedicated parity disk. With distributed parity in RAID 5 this
bottleneck is overcome, and write performance is better than single
disk limits.

2. These are SATA II drives which are rated at 3Gb/s, or 375MB/s;
even if single-drive I/O limits were a problem, we are not reaching
this value.

I think James Holton's suggestions are more on the mark. We will try
and investigate.

Thanks

Harry

On Jan 15, 2008, at 9:54 AM, James Holton wrote:

> Ahh, there is nothing quite like a nice big cluster to bring any
> file server to its knees.
>
>

------------------------------------------------------------------------
-
Harry M. Greenblatt
Staff Scientist
Dept of Structural Biology harry.greenblatt@weizmann.ac.il
Weizmann Institute of Science Phone: 972-8-934-3625
Rehovot, 76100 Facsimile: 972-8-934-4159
Israel



CCP4bb navigation

CCP4bb <-- 2008 <-- January 2008 <-- 15 January 2008
Previous message:
Subject: wich program to test an alternative phaser solution
From: Vellieux frederic {- dot -} vellieux {- at -} IBS {- dot -} FR
Date: 2008-01-15 		Next message:
Subject: Re: wich program to test an alternative phaser solution
From: Eleanor Dodson ccp4 {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
Date: 2008-01-15


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