Boot from Raid

[Matt harris]

Better is to mv and ln -s the /nsr directories to a mirrored disk on 
an external controller. And Host the Legato Server to its own machine
away from the production machine.

Matt
Stuart Remphrey - SMCC SE - Qld Australia wrote:
> 
> > Quoting leavitt@webcom.com:
> > >
> > > > > > 2.51. We would like to boot the 4000 from the raid and mirror the root =
> > > > > > volume. Is there any danger to booting booting from the array? Is there =
> > > > > The recommended method of disaster recovered is "high-availability"...
> > > > > dd your root disk to an equivalent internal disk on a nightly basis.
> >
> >       I hesitate to get into this.... but if the thing that you
> >       are trying to protect yourself against is an errant program
> >       or a misapplied patch, mirroring will only faithfully
> >       reproduce the error on the mirrors.  It provides no protection
> >       against these errors.  If, however the thing that you are
> >       trying to protect against is a sudden crash from a failing
> >       disk, mirroring my just be the ticket.
> 
> Good point!
> 
> We have customers using either or in quite a few cases both methods.
> That way you can guard against both disk/controller failure and
> finger problems (rm fred *; echo whoops 1>&2)
> 
> >       It remains to be seen if (by me anyway) if the mirroring will
> >       actually prevent a crash from a failed root disk, and even if
> >       it does, will it leave what is running in a state that is
> >       useful?
> >
> >       dd with tweaks for vfstab works fine - I've employed this and
> >       tested it many times over quite a few years without any
> >       problems.
> 
> Mirroring generally works as you'd expect, system keeps chugging along.
> 
> If you're using a backup product such as Solstice Backup and friends,
> it's a good idea to have a copy of the tape index files on the unmounted
> boot disk as well, in case you lose the lot -- saves rescanning the tapes.
> 
> Stuart.
> 
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