[linux-lvm] failing hard drive
Stuart D. Gathman
stuart at bmsi.com
Fri Mar 23 01:32:14 UTC 2007
On Thu, 22 Mar 2007, Lamont Peterson wrote:
> If you're not using RAID, might I suggest that you do? Those 9 disks would
> make a nice RAID5 or RAID6 array, and LVM works beautifully on top of
> software RAID, hardware RAID or any combination of both.
> LVM does not provide redundancy (yes, I know it can do mirroring, but I
> wouldn't suggest that), it's about easily managing lots of storage space.
> RAID is about reliability/redundancy. Use the right tool for the right job,
> and use both tools together to get all the best benefits of both.
In my use, reliability is paramount. So I prefer RAID1. You get
a performance boost for reads as well. The md based mirrors can be
mounted separately (careful!) if needed for data recovery and bug workarounds.
(E.g. On Centos-3 grub won't install on mirrored boot partition. So
unmount md0, setfaulty hdb1, mount hda1 /boot, grub-install, umount hda1,
mount md0, raidhotadd hdb1.) RAID5 arrays can only be accessed as raid.
Stuart D. Gathman <stuart at bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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