[Discuss] Insight about LVM

[gaf at blu.org (Jerry Feldman)]

On 10/24/2011 12:10 PM, Rich Braun wrote:
> David Rosenstrauch <darose at darose.net>
>> If you have a logical volume that spans multiple HDD's, and one of the
>> disks goes bad, the file system on your LV will be corrupted/lost.  (I
>> think this is similar to RAID-0?)  So, [installed] physical volumes
>> should be redundant RAID
>> devices themselves to avoid this problem.
> Yes.
>
> And I believe I first said this here on the BLU list sometime around, oh, 2003
> or so.  Motherboards almost always have 6 or more SATA connectors, brand-new
> disk drives have plummeted to about $60.  CPU and RAM overhead is negligible
> (under 3%) when you set up software RAID1 or RAID10.  And you get 2x the read
> performance if you use RAID1/RAID10.
>
> Q.E.D., unless you're concerned about 60 bucks (or the $4 annual electric bill
> per drive), then there is no reason not to install hard drives as pairs.
>
> Ever.
>
> Even if you can't spare the $60--you probably have old disk drives lying
> around that you can use.  For free.
>
> Never run Linux without RAID.
>
> Ever!
I would agree here. I had purchased a 1TB drive to pair up with my
existing 1TB drive a few years ago, but at that time there was a bug
that prevented me from doing a PVCreate. The bug has been fixed and I am
now running a full RAID1 and backing up to a $49 refurbished 1.5TB.
Initially the 1.5TB was showing some errors, but bad blocks fixed that.
I was too lazy to wipe the drive and return it. I have not had any
reported errors in a while.


-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
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