Re: raid question
On Tue, 19 Aug 2003, Rudy Gevaert wrote:
> Hi Alvin,
>
> I actually got it wrong in my original post: the first disk is on
> hdb. hda is a little disk that gets booted (boot and / are mounted on
> it). The disks in the raid don't get recognized by the bios. (I have
> tried everything...).
the bios will typically boot off hda or hdb or hdc or hdd
- check that the boot sequence inthe bios matches your list of
disks and cdrom and fd
> My first aim is to put /usr /var /home /data /archive in raid.
personally... i prefer "user data" ( /home ) in raid5 ...
and rest of the os and system (on a different disk ) is just plain old
non-raid
- but i have a blank spare disk ready to go in an instant
to replace a dead/dying system disk
even better to put the data on a whole new box...
- 2 different servers for "one server"
( if one dies, or power supply goes bonkers, the other server
( should survive ... along with bad memory faults that erases
( disks free of charge when e2fscsk tries to clean up your disk
( due to what it thinks are bad inodes in its bad memory
> /data and /archive are already in raid (without data, that data is on
> an other machine).
only if its partition type is "FD" .. otherwise its not
> An other question. When I want to put the /usr and /var in the raid
> is it ok if I do it this way:
>
>
> - boot with linux single
> - backup /usr/ and /var and put on e.g. one of the partions already in
> raid
assuming that /usr and /var are on its own partitions
- make sure its "FD" partition type
> - make the raid for the /usr and /var
> - mount them and put the data back
restore from "backup" :-)
> - change /etc/fstab
> - unmount
> - reboot
sounds fair ...
than start leaving disks disconnected and see what breaks
- test each disk .. that you can survive its failure
- i say spend the time now to test the "raid setup" now..
vs spending the time later trying to recover lost files
from a raid subsystem that wasn't tested properly
c ya
alvin
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