[SunHELP] more on mirroring

[Ivan Kovalev]

To avoid complications with Disk Suite mirroring I revert to daily
"manual" mirroring of system disks using ufsdump. See sample script for
this in one of the earlier reply.

Ivan

Tom Lieuallen wrote:
> 
> I saw the question and answers about mirroring in the last digest.
> I'm assuming that by having two disk bays and selling two disks
> with the 220 and 420's was so that people could and would mirror
> the boot disk.
> 
> But, from my perusal of the disksuite instructions on mirroring,
> I'm not sure what the recommended setup would be.
> 
> The problem I have is with the metadb's.  If you only have two
> disks, then they recommend putting at least two metadb's on each
> disk.  If one disk fails, it can continue to run with half of the
> databases.  However, if I read correctly, at boot time, it has to have
> half plus one or it won't boot.
> 
> So, does this mean that if you lose a disk in this setup, you have to
> replace it on the live system and let the mirroring setup the new disk
> before you reboot?  I assume one would have to manually remove the
> metadb's from the dead disk and partition the new disk before the
> mirror sync could or should happen.
> 
> Or, does it mean that if you lose a disk, you boot in single user off
> the remaining disk; remove the mirror config, boot again, and rebuild
> the mirror with a new second disk?  If it is this complex, then I
> question whether it is worth the effort.
> 
> Maybe the best question is whether people have good or bad experiences
> with mirroring the boot disk with disksuite, especially with only two
> disks, and what the procedure is if you lose one of them.
> 
> thank you
> 
> Tom Lieuallen
> Oregon State University
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