Re: 20TB Storage System (fsck????)
From: Petri Helenius (pete_at_he.iki.fi)
Date: 09/03/03
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Date: Wed, 03 Sep 2003 21:52:49 +0300 To: Piotr KUCHARSKI <chopin@sgh.waw.pl>
Piotr KUCHARSKI wrote:
>How many is "too many"? Or, rather, what are write-performance penalties
>when using sixteen disks in one hw raid5 set? (With two raid volumes,
>2TB and 1.75TB available for OS.)
>
>
With raid5 you read one and write two disks for each write, wide arrays
really hurt
when running on degraded mode but I donīt see whatīs the issue when running
fully operational? Though people usually expect raid to deliver some
performance
when degraded so running raid50 instead of too wide raid5 is usually a good
idea. (50 being striped raid5 arrays)
Pete
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