Date: Mon, 31 Jan 2000 03:45:00 -0000 From: Stefan_Huerter@LU2.maus.de (Stefan Huerter) To: freebsd-scsi@FreeBSD.ORG Subject: hardware vs software stripping Message-ID: <200001310445.p54310@lu2.maus.de>
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Guckux Marc
> website and searching all over the web to find a solution for
> performing fast reads on an array of disks. The best choice seems
> to be raid-0 for our database using postgresql. The alternatives
> are either raid-1 which seems too wasteful on disks or raid-5 which
> provides fault tolerance. This last option could substituted for a
> tape backup and the possibility of a few minutes down time in case
> of disk failure. Problem is: hardware or software?
My opinion:
RAID-5 and databases are two different worlds, it's useful for inexpensive
storage and a database with very low-write accesses. The read-performance
is so far OK, but the writes brake down the database performance.
I recommand for all of my customers only RAID0+1, but there's a waste of
storage (but necessary for reliability).
And: RAID5 is no substitute for a Backup, these are definitily two worlds.
> For hardware, I've been looking at the smartraid iv controller from
> dpt
There are other hardware-controllers on the market, eg IFT and others,
beginning with 3 SCSI-channels, one for the host, 2 for the devices,
built-
in-Ram and more (supporting RAID0,1,5 and some more...).
Or, to go back to the low-cost solution, there is Arena, SCSI-interface to
the Host and working with IDE-drive with a few IDE-bus'.
Bye
Stefan
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