Doug Ledford wrote:
On Sun, 2006-11-12 at 01:00 -0500, Bill Davidsen wrote:
I tried something new on a test system, using the install partitioning
tools to partition the disk. I had three drives and went with RAID-1 for
boot, and RAID-5+LVM for the rest. After the install was complete I
noted that it was solid busy on the drives, and found that the base RAID
appears to have been created (a) with no superblock and (b) with no
bitmap. That last is an issue, as a test system it WILL be getting hung
and rebooted, and recovering the 1.5TB took hours.
Is there an easy way to recover this? The LVM dropped on it has a lot of
partitions, and there is a lot of data in them asfter several hours of
feeding with GigE, so I can't readily back up and recreate by hand.
Suggestions?
First, the Fedora installer *always* creates persistent arrays, so I'm
not sure what is making you say it didn't, but they should be
persistent.
I got the detail on the md device, then -E on the components, and got a
"no super block found" message, which made me think it wasn't there.
Given that, I didn't have much hope for the part which starts "assuming
that they are persistent" but I do thank you for the information, I'm
sure it will be useful.
I did try recreating, from the running FC6 rather than the rescue, since
the large data was on it's own RAID and I could umount the f/s and stop
the array. Alas, I think a "grow" is needed somewhere, after
configuration, start, and mount of the f/s on RAID-5, e2fsck told me my
data was toast. Shortest time to solution was to recreate the f/s and
reload the data.
The RAID-1 stuff is small, a total rebuild is acceptable in the case of
a failure.
FC install suggestion: more optional control over the RAID features
during creation. Maybe there's an "advanced features" button in the
install and I just missed it, but there should be, since the non-average
user might be able to do useful things with the chunk size, and specify
a bitmap. I would think that a bitmap would be the default on large
arrays, assuming that >1TB is still large for the moment.
Instructions and attachments save for future use, trimmed here.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
