Hi all,
I have setup a software raid5 array consisting of 3 sata hard drives with a
small boot partition at the beginning of the first disk. Therefore the setup
is as follows:
_____________________________________________________________
sda | /boot | swap | raid5
|
|_______|_______|___________________________________________|
____________________________________________________________
sdb | raid5 |
|
|_______________________________________________|___________|
____________________________________________________________
sdc | raid5 |
|
|_______________________________________________|___________|
The purpose of what I would like to do arrises from the fact that in the
event of sda failure, I wont be able to boot the raid array. Therefore,
perhaps I can make a one off backup of the /boot partition to backuppc and
then should failure happen, I can just restore the backup of the /boot
partition and have the machine boot, and raid5 will automatically recreate
the failed raid partition on sda.
I hope this makes sense; please correct me if I'm wrong.
However, another option I am considering and am pushing for is to copy the
boot partition over to sdb and sdc (in the area available after the raid
partition). I know this can be done using the dd command but finding out
where the free partitions on sdb and sdc start aswell as where the /boot
partition ends is giving me problems. The partitions dont seem to add up!
FYI:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md0 540G 1.4G 511G 1% /
/dev/sda1 76M 13M 60M 18% /boot
/dev/shm 501M 0 501M 0% /dev/shm
hdparm /dev/sdXX
/dev/sda1:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36483/255/63, sectors = 82220544, start = 63
/dev/sda2:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36483/255/63, sectors = 1061061120, start = 160650
/dev/sda3:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36483/255/63, sectors = 298939576320, start = 2233035
/dev/sdb1:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36481/255/63, sectors = 300066407424, start = 63
/dev/sdc1:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36481/255/63, sectors = 300066407424, start = 63
As far as I understand, with raid5, all raid5 partitions have to be the same
size, so why aren't sda3, sdb1, sdc1 not the same size?
I appreciate this is slightly off-topic but please advise me.
Kindest Regards
Khaled Hussain
Server Administrator
Coulomb Ltd
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