Arnold Krille <arn...@arnoldarts.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
Out of the Box Solutions, Inc.
Creative IT Solutions Made Simple!
http://www.OutOfTheBoxSolutions.com
tmas...@obscorp.com
22108 Harper Ave.
St. Clair Shores, MI 48080
Office: (800)750-4OBS (4627)
Cell: (586)945-8796
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