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Re: [PLUG] organizing files on software Raid (SCSI)
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hi
Heres just one more option for you, if you
want to do away with the IDE disk and want
to use just the 2 scsi disks you got. I've set
this up for a friend of mine ( 2 SCSI disks
hanging on a internal scsi card). The
system boots on /dev/sda:
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Filesystem Size Used Avail Use% Mounted on
/dev/sda5 1008M 153M 804M 16% /
/dev/sda1 124M 18M 99M 16% /boot
/dev/sdb2 1008M 211M 746M 22% /cache
none 503M 0 503M 0% /dev/shm
/dev/sdb1 2.0G 34M 1.8G 2% /tmp
/dev/sda2 4.9G 3.2G 1.5G 68% /usr
/dev/sdb5 985M 410M 525M 44% /misc
/dev/md0 25G 636M 23G 3% /var
/dev/md1 985M 23M 912M 3% /log
/dev/cdrom 675M 676M 0 100% /mnt/cdrom
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[root@xxxxxxxxxx root]# swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 1048568 37320 -1
/dev/sdb3 partition 1048568 0 -2
[root@xxxxxxxxxx root]#
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[root@xxxxxxxxxx root]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md1 : active raid1 sdb7[1] sda7[0]
1024896 blocks [2/2] [UU]
md0 : active raid1 sdb6[1] sda6[0]
26624896 blocks [2/2] [UU]
unused devices: <none>
[root@xxxxxxxxxx root]#
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As you see sda and sdb have both raid (level 1) and
non-raid partitions. The system boots on
/dev/sda. the partitions /, /boot,
/tmp, /usr , and swap spaces are scattered on
non-raid paritions, but /var and /log (which
where our really important data resides) are
on raid. (Your filesystem requirement will
be different of course.)
In this scenario
I understand that if /dev/sda disk is to die,
i'll have to reinstall the OS on another disk
and somehow mount /dev/sdb (thats acceptable
to me since i do no kernel recompiles for
this machine and I only care about /var and /log)
If /dev/sdb dies it wont boot and we'll have
to get a disk quick, partition and format it,
and raidhotadd and mount it.
With 2 disks this is the best i've come up with
at the time. But if i were to do it again I
would have tried to setup root raid (all partitions
on raid). But At that time i was afraid of facing
kernel support problems later if i have to recover
the disks.
e.pike
_________________________________________________________________________
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