SING Jack wrote:
> Dear All, I have replace one of the SAS with SATA, We had install
> the Fedora 12 successfully in the SATA, but I still unable to see
> the SAS HDD that connect to PERC S300.
>
> If S300 does not support all linux, then I am wondering the System
> Management and Documents Tools that ship with the server was in
> Linux base, if I boot from this Disc with advance option I was
> manage to see the un-partition SAS HDD. I believe it only unable to
> see during the installation phase. After that I believe we can
> install the SAS controller driver so that we can see the SAS again
> before we run another reinstallation from existing kernel.
>
> Do you think above work? If yes, we would appreciate some genius
> advice/HOWTOs for above to be done as I am newbie to Linux word
-----
To one RAID "newb" from another, I installed my first linux SW
RAID on a PE610. It was fairly painless.
It sounds like you got sold a 'driver', to do raid (which is a
bit weird, since Windows does software raid on generic disks, 0 and 1
on workstations, but I believe even 5 can be enabled).
But I'll share my infinite googly wisdom (:-)). I typed in
'linux software raid howto' and used the first one that came up. But
this one, "http://linux-raid.osdl.org/index.php/Linux_Raid";, looks
like a more comprehensive store of information, but I believe I used
the HOWTO at "http://tldp.org/HOWTO/Software-RAID-HOWTO.html";.
If your raid is large (>2T), you might want (have) to use Gnu
parted. PC partitions are limited to 2 or 4T (think it's 2T). If you
use fdisk, you won't get the full space.
The HOWTO's above should guid you through the full process. I
was running SuSE 11.1 when I did the install. That SW RAID is being
used for backups. Write Speed ~150MB/s max, max read, max read is
about 357MB/s (which is about 95% efficiency, given the max read speed
of 3 data spindles (I implemented a RAID5 with 4 disks)). Given that
the raid is spun-down most of the time, that's more than fast enough
for my setup. My limiting factor is 'gzip' which, thinking about it
as I write this -- I should just eliminate (it slows down the
throughput to ~10MB/s which seems like alot given how fast gzip is,
but, that's what the average was over a 6-hour backup of one of my
large partitions).
Check out the Howto's. If those speeds are acceptable, that's
your answer. If you need faster, get a hardware LSI-RAID card with
onboard memory and battery backup. Might as well order it through
Dell and let them support everything if you have a support contract.
Hope this helps... -l
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