On Tue, 11 Apr 1995 07:48:38 EST Bill Coughlin said:
>As part of the consolidation, we also plan on consolidating disk
>storage.  We have several 20GB RAID devices attached (16GB defined as
>one volume - mainly because of LAN administrative issues).  We are
>now talking about possibly well over 100,000 files and thousands of
>directories.  We are running the MVS server version of ADSM with the
>majority of the servers on 16MB rings. (mixture of APPC and TCP/IP on
>3172's and 3745's).  The backup time doesn't concern me.  The restore
>time for individual files and directories doesn't concern me.  What DOES
>CONCERN ME is the projected amount of time to DO A FULL RESTORE for
>disaster recovery scenarios - we are talking several DAYS to get back
>a 16GB drive!

I share your concern.  We did a restore here of some 30000+ files for
a unix filesystem, ~500+M and it took some 14hrs.  Not the speed I was
hoping for.  I've changed to collating my tape storage in hope of
paring at least an hour or so off from tape mount waits but, I'd hate to
have to do a restore on any of the 1+GB drives out there.  Taking
better than 24hours to restore a single multi-GB drive is a serious
problem for ADSM in the long run as storage continues to increase
so dramatically.  With 4GB drives generally available now and 10GB
coming down the pike, I'd expect this to become a more pressing issue
for ADSM in the _very_ near future.

>Are others using large volumes (>4GB) and if so, what are you doing
>for Disaster Recovery.  Are there quicker ways to get a full server
>back?  How about Lan File Services (LFS)? Could this be used somehow
>(channel attached) to restore a server with 16GB (or more) on it.
>As multi-media/full motion video, etc. takes off, we will be looking
>at LAN storage requirements in the hundreds of GB! - we have to look
>at this problem now.

Right now I just hope one of the big ones doesn't bomb.  I'd like to
know as well, we've got a couple of NT servers going to 20GB raid box
country so as soon as the NT client comes out, I'll be in the same
spot as you.

---
Keith A. Crabb         Keith AT UH DOT EDU
Keith A. Crabb         Keith AT UH DOT EDU
University of Houston  Operating Systems Specialist +1-713-743-1530