We use Mirrored Disk/XL and it works great.  If you are familiar with
setting up and using private volume sets, Mirrored disk is easy.  Basically,
you get a different version of VOLUTIL, and you use NEWMIRRSET
instead of NEWSET and NEWMIRRVOL instead of NEWVOL.  They differ
only in that they allow you to specify two Ldevs for the mirrored pair.  It's
really great when you lose a disc drive and your system doesn't miss a
beat!

On the other hand, your assertion that it might be overkill is certainly valid.
 If, as you say, it's "no big deal" to lose 24 hours' worth of work at your
shop, then I would think it would be hard to justify the cost of Mirrored
Disk/XL and twice as many disks.

>>> Mark Wilkinson <[log in to unmask]> 02/26/98
09:57am >>>
One of our affiliates has just ordered a new 3K and seems to have been
persuaded to get
Mirrored Disk/XL. I have no personal experience of this and none of the
other 11 Affiliates
use it.

Can anyone out there tell me the pros and cons? The system tends to be
supervised by
a "Super-User" rather than an IS person so we try to keep things as
simple
as possible
operationally. To me it sounds like overkill.. The system runs maybe 7-8
users and we have
Image Logging switched on. We do full backups once in every 24 hours
so
even if the disks
crash we would lose max 24 hours data which is no big deal.

Thanks in advance

Mark Wilkinson.
Sony Pictures Europe.