Linux DPT Hardware RAID HOWTO : Usage
5. Usage
5.1 fdisk, mke2fs, mount, etc.You can now start treating the RAID as a regular disk. The first
thing you'll need to do is partition the disk (using fdisk). You'll
then need to set up an ext2 filesystem. This can be done
by running the command:
% mkfs -t ext2 /dev/sdxNwhere /dev/sdxN is the name of the SCSI partition. Once you do this,
you'll be able to mount the partitions and use them as you would any
other disk (including adding entries in /etc/fstab). 5.2 HotswappingWe first tried to test hotswapping by removing a drive and putting
it back in the DPT-supplied enclosure/tower (which you buy for an
additional cost). Before we could carry this out to completion, one
of the disks failed (as I write this, the beeping is driving me
crazy). Even though one of the disks failed, all the data on the RAID
drive is accessible.Instead of replacing the drive, we just went through the motions
and put the same drive back in. The drive rebuilt itself and
everything seems to be okay. During the time the disk had filed, and
during the rebuilding process, all the data was accessible. Though it
should be noted that if another disk had failed, we'd have been in
serious trouble. 5.3 PerformanceHere's the output of the Bonnie program, on a 2144 UW with 9x3=17
GB RAID 5 setup. The RAID is on a dual processor Pentium Pro machine
running Linux 2.0.32. For comparison, the Bonnie results for the IDE
drive on that machine are also given.
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
RAID 100 9210 96.8 1613 5.9 717 5.8 3797 36.1 90931 96.8 4648.2 159.2
IDE 100 3277 32.0 6325 23.5 2627 18.3 4818 44.8 59697 88.0 575.9 16.3It's clear that the RAID is great for block reads and writes (even
though write performance is degraded by using RAID-5), but it is not
very good at sequential re-writes.
P
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