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Re: [BackupPC-users] Archive function
2012-03-16 17:00:28
Arnold Krille <arnold AT arnoldarts DOT de> wrote on 03/16/2012
04:22:04 PM:
> even if you intended for this question to be off-list, I think my
answer
> could be interesting to others as well;-)
No problem. It's kinda off-topic, but if it
helps others, then great.
> And it works rather nice. (Some other parts of these first experiments
> didn't go that well. Lets just say gfs2 isn't my friend for the next
year.)
Yeah. I have yet to find a distributed filesystem
I've found useful. I think that's why DRDB is so popular! :)
(GFS *must* be useful to more than a few people, but they must have
*far* more time and money to throw at it than I ever will.)
While we're off-topic: Does anyone have a distributed
filesystem (with actual locking!) that they like? *TREMENDOUS* bonus
points if it's useful over wan-speed links! (i.e.: *truly* distributed!)
> As for disk-mirroring with drbd and/or md and/or lvm:
> - One thing I learned from hard (bad) experience is that when
using
> mirroring, you should always use two different disks. Buy the same
disks
> at the same time (bonus points for directly incrementing serial
> numbers), put them in the same machine, let them live through the
same
> usage and you will find that they also break at the same time.
Yeah. Much easier to do with off-the-shelf IDE
drives. The part I have a hard time doing that with is with hot-swap
SAS drives... Which is why hot spares are now standard on all of
our SAS arrays! :)
> Don't tell me this doesn't happen because it never happened to you,
it
> happened to me and to people I know. And I can show you the statistical
> calculation that I am right.
I've had *more* than one array have drives fail within
a week of each other. That's close enough, thank you. (Hence
those hot-spares).
> - You should stay away from hw-raid. It might give you a bit
more
> performance. But if you don't keep a second controller spare, you
are
> f***ed when the controller goes to the electronic heaven and your
client
> insists that he paid a premium for the raid to have "zero downtime".
:) For us, hardware raid is our standard on
high-end (hot-swap SAS) RAID hardware. But for those boxes, a 24x7
4-hour (or even 2-hour) response warranty is also standard.
Having said that, I've *never* had a RAID controller
fail (IBM ServeRAID). Some have been pretty poor (such as the ServeRAID
8k), and drives fail, of couse, but never an array. And I've never
lost an entire IBM RAID array for any reason. Other manufacturers,
yes (I'm looking at you, Dell).
Thank you very much for the information. I appreciate
it.
Tim Massey
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