Hello all. I found this address in the Raidtools-0.90.2 (Alpha) package.
I'm not sure if this is a mailing list or not. If so, please copy answers
to these questions to my personal address as I am not yet a member of the
list. Thanks.
The issue is RAID-1 swap. I'm a little unclear as to which method to use to
ensure best availability for my server. Currently I have two 10 gig EIDE
drives with identical partitions set up as follows:
Disk /dev/hdb: 16 heads, 63 sectors, 19870 cylinders
Units = cylinders of 1008 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 * 1 21 10552+ 83 Linux
/dev/hdb2 22 19870 10003896 5 Extended
/dev/hdb5 22 282 131512+ 82 Linux swap
/dev/hdb6 283 19870 9872320+ 83 Linux
(Same for drive hdc)
The idea is to make the swap on both drives mirrors of each other so that my
system won't go down in the event one drive fails. First of all, will this
work? If so is there anything special I need to configure in the
/etc/raidtab file to accomodate swap as opposed to ext2.
If this won't work is there a suggested way to ensure my server won't go
down if a drive dies? I'm assuming the only real problem to address here is
swap.
In case you're interested here's some other tidbits from my filesystems:
[root@holland /]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md3 : active raid1 hdc6[1] hdb6[0] 9872256 blocks [2/2] [UU]
md1 : active raid1 hdc5[1] hdb5[0] 131392 blocks [2/2] [UU]
md0 : active raid1 hdc1[1] hdb1[0] 10432 blocks [2/2] [UU]
unused devices: <none>
[root@holland /]# cat /etc/raidtab
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4
persistent-superblock 1
device /dev/hdb1
raid-disk 0
device /dev/hdc1
raid-disk 1
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4 # <------------- Intended for
swap
persistent-superblock 1
device /dev/hdb5
raid-disk 0
device /dev/hdc5
raid-disk 1
raiddev /dev/md3
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4
persistent-superblock 1
device /dev/hdb6
raid-disk 0
device /dev/hdc6
raid-disk 1
