On Fri, 24 Aug 2007, Tomasz Chmielewski wrote:
Justin Piszcz schrieb:
On Fri, 24 Aug 2007, Tomasz Chmielewski wrote:
I built RAID-5 on a Debian Etch machine running 2.6.22.5 with this
command:
mdadm --create /dev/md0 --chunk=64 --level=raid5 --raid-devices=5
/dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
After some time, it was synchronized just fine.
I removed one drive, put it back again, readded the drive to the array.
It started rebuilding.
However, if the rebuilding is not 100% done, and I reboot the machine,
rebuilding starts from 0.
(...)
It should continue (at least that is what I have seen in the past), not
sure if you need bitmaps or not (I dont use them).
I had the same issue, with 4 drive RAID-10, on another Debian box.
Perhaps, the bitmap is needed then? I guess by default, no internal bitmap is
added?
# mdadm -X /dev/md0
Filename : /dev/md0
Magic : 00000000
mdadm: invalid bitmap magic 0x0, the bitmap file appears to be corrupted
Version : 0
mdadm: unknown bitmap version 0, either the bitmap file is corrupted or you
need to upgrade your tools
The fine manual says:
BITMAP CHANGES
A write-intent bitmap can be added to, or removed from, an active
array. Either internal bitmaps, or bitmaps stored in a separate file
can be added.
However, I'm not sure how to achieve it? How to add an internal bitmap to an
array without a bitmap?
--
Tomasz Chmielewski
http://wpkg.org
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That has been discussed on the mailing list before I believe.
-e , --metadata=
Declare the style of superblock (raid metadata) to be used. The
default is 0.90 for --create, and to guess for other operations.
The default can be overridden by setting the metadata value for
the CREATE keyword in mdadm.conf.
Check the archives or ping Neil (especially) if you do not have a backup
of your environment.
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