Re: RAID Controller Failover

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Article #527

#527

From: Zak
Date: Sat, 08 Nov 2003 16:55

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Jake Roersma wrote:

> I've noticed as the controllers get more advanced that the caching and
> other alogrithms used minimize the actual write times that the host
> system sees.  My tests on the recent HP equipment show that the difference
> in write times between RAID-1 and RAID-5 are within 1MB of each other.  I
> have a hard time believing that anyone would be driven away from RAID-5
> due to performance factors on high-end equipment.  I have the bonnie++
> stats if you'd like to see them.

Random small writes can still kill you. One write turns into 
read-read-write-write. Latency doubles, throughput is a quarter.


Thomas

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Subject: Re: RAID Controller Failover
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