Re: Software RAID vs Hardware RAID
From: Walter Mautner (nextnews.15.eatallspam_at_spamgourmet.com)
Date: 12/16/03
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Date: Tue, 16 Dec 2003 20:17:43 +0100
ddl wrote:
> Hi all,
>
> Wonder have anyone tried hardware or software RAID? I would like to
> configure my mail server(RH7.3) to run on software RAID due to budget
> constraints.
> But I have heard that software RAID is not that stable as compared to
> hardware RAID. But I wonder if this applies to MD driver in linux...
>
Got a GDT hardware raid controller at work (in some old PIII-500 server, now
set up with mdk9.2), one stripeset of two (old ...) wide-scsi-disks gives a
hdparm -t of about 27 MB/sec.
At another workplace, a old aix4.2 box with scsi and OS-software-lvm+raid,
quite stable for years now.
At home, a AthlonXP2100 KT400 board with 2x80Gig ide disks, I get on a
stripeset:
/dev/md4:
Timing buffer-cache reads: 1244 MB in 2.00 seconds = 622.00 MB/sec
Timing buffered disk reads: 232 MB in 3.00 seconds = 77.33 MB/sec
Now it's easier to install on a hardware raid (after the raid-bios
configuration) ... but then, I have no clue about how to recognize a
failing mirror disk from a remote location?
Stability ... so far no problem at all, even though my mainboard didn't like
the athcool program as well as the "halt on idle" bios setting and gave
random reboots until I turned that off again. You will really want to use a
journalling filesystem, in particular reiserfs. It's rock-stable ... unless
once (experimenting ...) I downloaded a O&O linux "defrag" trial tool, and
it didn't complain but always hung somewhere, on a raid-1 ext3 partition.
With rather disastrous results on next boot. Ok, that was when I already
was eager to do a clean install of Mdk9.2 :).
Nevertheless, scsi raid controllers support hot swapping, and you can build
a multi-disk raid-5 without having to use an extra pci controller. Also,
scsi disks are usually of better quality/more cache/shorter accesstime, and
are said to live longer. Elevator sorting of drive access tasks appears to
be standard in linux and that should not make much difference, no matter if
ide or scsi.
-- Longhorn error#4711: TCPA / NGSCB VIOLATION: Microsoft optical mouse detected penguin patterns on mousepad. Partition scan in progress to remove offending incompatible products. Reactivate your MS software (3 days grace period). [LinuxCounter#295241]
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