[CentOS] Backup and reinstall a CentOS server
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Wed Sep 3 09:04:04 UTC 2008
> I believe that if /boot is on RAID1, that md partition has to be on one
> of the first two disks (eg hda, hdb)?
> Is there any problem with having /boot on a RAID1 partition across 4
> disks as follows?
> /boot / (LVM)
> hda RAID1 RAID5
> hdb RAID1 RAID5
> hdc RAID1 RAID5
> hdd RAID1 RAID5
The boot loader (GRUB) must be installed in the MBR on a hard disk from
which the BIOS can boot. With 4 disks, you can install GRUB on all
disks, so you can boot even if the first 2 disks fail.
I think it doesn't matter if /boot is the first or another md raid
device. It just must not be a LVM.
> What about swap? It is best on RAID1, RAID5, LVM, something else or
> doesn't matter?
we're using swap via LVM without any performance problems. but my
opinion is if a server begins to swap things will get slow anyway no
matter what type of disk you're using for swap (maybe excluding flash
drives / ramfs).
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