please no private-only respones
Am 12.04.2017 um 16:52 schrieb linuxknight:
Thanks you for the reply. I was just examining the hardward in my
server and it looks like there is an LSI card in there. If I create a
new Hardware raid mirror in that controller, is it possible to use the
ddrescue to get my current OS onto that mirror and boot from it? Im
unfamiliar with the ddrescue but will certainly read up more.
"ddrescue" is at the end of the day the same as "dd"
it reads the whole drive block-by-block and writes it to a image file,
later you can do "dd if=image.mig of=/dev/sdX bs=1M" and you get a 100%
identical state of the disk
so just put out that drive, connect it to a ordinary SATA adapter, take
the image and be happy that you have a backup, if the RAID-controller
has stored whatever metadata on begin of the drive it's also part of the
image
and hence leave out that controller to get a 100% block-by-block copy of
the whole drive
On Wed, Apr 12, 2017 at 10:45 AM, Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote:
Am 12.04.2017 um 16:31 schrieb linuxknight:
Last weekend I was moving a server with a raid1 configuration,
controlled by a Intel Corporation 82801 SATA RAID Controller. Upon
reboot I noticed the degraded message (server hadnt been rebooted in a
couple years).
The raid1 array was two 500gb black WD drives. I wasnt able to locate
an identical 500gb disk, but did find a 2TB just to get things
mirrored again. The bios screen accepted the replacement disk and
said it would rebuild in the OS. mdsync seemed to do its thing but I
noticed mdmon process was taking 200% cpu. I let it go a few days
thinking it was just taking longer than normal to sync, then rebooted.
It was in a complete failed state and wouldnt boot at all. After
removing the 2TB disk I was able to boot into the OS again. I just
assumed I needed a similar drive size for the second part of the
mirror.
when you talk about a "SATA RAID Controller" and "The bios screen accepted
the replacement disk and said it would rebuild in the OS" this sadly is not
a "linux software raid" at it's own
197 Current_Pending_Sector -O--CK 200 200 000 - 9
198 Offline_Uncorrectable ----CK 200 200 000 - 7
i would strongly suggest https://www.gnu.org/software/ddrescue/ and make a
image of that disk because after 39646 Power_On_Hours it's likely that the
remaining disk fails completly in a short time and you could at least
restore the disk-image with "dd" to a new disk if that happens as well as
mount it with as loop-device
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