Re: How to Boot with LVM
Rick Thomas a écrit :
> I configure a small (<1GB) "/boot" partition as a primary partition
> (e.g. /dev/sda1) on one of the disks, with the same space on the other
> disk unused. 
> The two swap partitions I set up as a RAID0 (e.g. /dev/md0). This will
> be my system swap. 
>  I know there are ways to make grub work with RAID1, but it's too
> complicated for me to get it right.
1) Set up /boot as RAID 1 (or 5, 6, 10).
2) grub install /dev/sda ; grub install /dev/sdb
How is that complicated ?
>  There's no particular point in putting swap on a redundant RAID.
Yes there is : system availability. Defective swap may have the same
catastrophic effect as defective memory.
RAID is not only about data redundancy. Redundancy is used to allow the
system to tolerate a disk fault and continue to operate untill you
decide to replace the faulty disk. But maybe you don't care about your
> If your swap develops a bad spot, you probably want to boot from a CD
> into rescue mode ASAP so you can take necessary measures to fix the
> problem. Using RAID1 for swap would just mask the problem - possibly
> until it's too late.
Are you serious ?
Mdadm monitoring can warn you as soon as a faulty disk is detected,
allowing you to take appropriate action while the system is still operating.
Without redundancy, a defective swap may cause the system to misbehave
or even crash at any time without any warning !
>  Conversely, everything else on the system wants to be redundantly
Why ? If you don't care about availability, just restore from the
backup. No need for RAID.