10 Oct
2004
10 Oct
'04
8:38 p.m.
On Sun, 10 Oct 2004 13:29:49 -0500
"Jay West" <jwest(a)classiccmp.org> wrote:
Interesting. I haven't used a promise card in a
long time... but I
thought I recalled the OS (FreeBSD) only seeing the logical drives,
not the physical ones.
Maybe FreeBSD has a special driver that can detect the
Promise RAID
setup and do the software RAID just like the Promise BIOS?
I could well be wrong. Looks like 3ware two drive raid
0,1 controllers
can be had for $115. Add to that a $60 some odd cost for another 160gb
drive, and we should be cool.
You have to by two RAID controllers if you wane be
real save. You need a
spare in case the RAID controler fails. The RAID controler is a single
point of failure!
Just because you CAN do a thing, doesn't mean you
should. I view cpu
cycles as precious and not to be used frivolously even when available
in good supply. Perhaps it dates back to my mentality of pouring over
machine code to save a cycle here and there :)
It depends on the load that the
server already has and how much overhead
software RAID1 causes. Typically RAID1 doesn't cost that much CPU. To
the past - present comparision: CPUs got a _lot_ more faster then disk
dirves in the past 20 years. See the thoughts behind the BSD LFS.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/