Pure genius! I wonder how many Thumpers have been configured in
this well thought out way :-).
I'm sorry I missed your contributions to the discussion a few weeks ago.
As I said up front, this is a test system. We're still trying a number
of different configurations, and are learning how best to recover from
a fault. Guy Watkins proposed one a few weeks ago that we haven't yet
tried, but given our current situation... it may be a good time to
give it a shot.
I'm still not convinced we were running a degraded array before this.
One drive mysteriously dropped from the array, showing up as "removed"
but not failed. We did not receive the notification that we did when
the second actually failed. I'm still thinking its just one drive that
actually failed.
Assuming we go with Guy's layout of 8 arrays of 6 drives (picking one
from each controller), how would you setup the LVM VolGroups over top
of these already distributed arrays?
Thanks again,
Norman
On Feb 20, 2008, at 2:21 AM, Peter Grandi wrote:
On Tue, 19 Feb 2008 14:25:28 -0500, "Norman Elton"
<normelton@xxxxxxxxx> said:
[ ... ]
normelton> The box presents 48 drives, split across 6 SATA
normelton> controllers. So disks sda-sdh are on one controller,
normelton> etc. In our configuration, I run a RAID5 MD array for
normelton> each controller, then run LVM on top of these to form
normelton> one large VolGroup.
Pure genius! I wonder how many Thumpers have been configured in
this well thought out way :-).
BTW, just to be sure -- you are running LVM in default linear
mode over those 6 RAID5s aren't you?
normelton> I found that it was easiest to setup ext3 with a max
normelton> of 2TB partitions. So running on top of the massive
normelton> LVM VolGroup are a handful of ext3 partitions, each
normelton> mounted in the filesystem.
Uhm, assuming 500GB drives each RAID set has a capacity of
3.5TB, and odds are that a bit over half of those 2TB volumes
will straddle array boundaries. Such attention to detail is
quite remarkable :-).
normelton> This less than ideal (ZFS would allow us one large
normelton> partition),
That would be another stroke of genius! (especially if you were
still using a set of underlying RAID5s instead of letting ZFS do
its RAIDZ thing). :-)
normelton> but we're rewriting some software to utilize the
normelton> multi-partition scheme.
Good luck!
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