26 Apr
2002
26 Apr
'02
6:52 a.m.
My primary reason for using raid1 is speed. However, the failover is a great
added benefit (as long as the controller supports booting off the raid set -
some do, some don't).
Jay West
----- Original Message -----
From: "Hans Franke" <Hans.Franke(a)mch20.sbs.de>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, April 26, 2002 5:35 AM
Subject: Re: new server status and RFC on problem tracking database for all
classic OS's
> Well, by
now I have 3 PCs (AMD) running with motherboard IDE Raid.
> one is just stripeing, the other two mirroring. all three work
> 100% hasslefree. I can't tell about the recovery, because I don't
> needed it until now. but the second mirror configuration was created
> on the fly - an existing harddisk as #1 and a new as #2 and it started
> copying right away.
Just a wee reminder about RAID 1 (mirroring)
controllers. The
one I have is useless EXCEPT that with a Pentium III 750, the
PCI controller can handle four EIDE drives with a sustained
throughput of 33 MBytes per second or about 2 Gbytes per
minute. This means that I can copy a 1 GByte file from one
hard drive to the other hard drive in about 1 Minute.
As for the RAID 1 (mirroring) function, don't
wait until you have
a hard drive failure. Find some way to simulate an error - I just
unplugged one hard drive. If the RAID 1 firmware/software
can't handle the problem, then the mirroring function is not much
use when you don't know what the problem is. So if the RAID 1
is not helpful after you have the problem and if you never have
a problem you don't need RAID 1 in the first place, why bother.
Well, that's what I exectly started to test. As I told earlyer,
when plugging in a new disk it did duplicate the existing disk
onto the new one right away. The above mentioned test was if both
copies are independant usable as first drive for recovery.
I won't start the final test, the one where I put both disks
together again, to see how it recovers teh inconsistent system,
until next week, since I need the machine to woork the next 3 days.
EXCEPT in my case, I kept it for the RAW SPEED.
That's why I used stripeing on my game machine :)
Gruss
H.
--
VCF Europa 3.0 am 27./28. April 2002 in Muenchen
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