[CentOS] Re: Centos 4.2 and Boot/Root on RAID?
Bryan J. Smith
thebs413 at earthlink.net
Thu Oct 20 18:57:59 UTC 2005
Steve Bergman <steve at rueb.com> wrote:
> Good points as to the advantages of software RAID.
> This machine is fully certified by RedHat, but the
> CERC 6ch controller is uncertain,
The CERC 6ch uses the aaraid driver.
Administrative tools are largely lacking though.
It's also an old Intel i960-based design, so it's rather
sluggish. At RAID-5 its so-so, the i960 is a bit of a
bottleneck with today's drives. But at RAID-0, 1 or 10, the
i960 will be a massive bottleneck.
> so software RAID seems the right choice.
The question is, how are you going to do software RAID? Are
you going to use the AIC-7xxx SCSI channels on the CERC 6ch?
If that does bypass the sluggish i960, then it would probably
be faster at RAID-5 and far, far faster at RAID-0, 1 or 10.
But if you have to put the i960 in JBOD mode, the i960 still
might be a bottleneck to the SCSI channels.
Which means you're not going to see any better performance,
so you might want to just use the i960 hardware RAID.
[ SIDE NOTE: This is why I don't like generalized RAID
discussions. How to do RAID is a question of what hardware
you have -- for _both_ software or hardware. ]
Bryan J. Smith | Sent from Yahoo Mail
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