We've just added some fast ethernet in with our fddi (our servers have
     2 or 3 interfaces)
     I just did an export from one adsm server to a virtual volume on
     another adsm server 'bout 6 miles away via a new fast ethernet link
     and it was the BEST EVER !

     In the past 1.2GB/hr avg. was the best I could get with the export...
     I just had a 3.34GB export finish in 26 minutes, that's about 7GB/hr!

     You should be able to have your backups/restores hit the same.

     260GB  HA!!!
     Try 1 TB  ===-------->>>>>> USE Client compression.
     We archive a 1 TB sap data base in 12-ish hours, it compresses down to
     220-ish GB, a restore off the diskpool runs in less than 24 hours.
     Our diskpool (with cache on) holds one day's worth of sap pr archives.
     They go to tape as soon as we get them but the cached copies stay on
     disk for FAST disaster recovery situations... any restore of data
     older than the current/latest backup ain't for disaster recovery
     reasons and takes a little longer comming from tape.  This too will
     probably be reduced soon based on what I've just seen with the fast
     ethernet export results mentioned above.

     I'll try to find out what parms our unix god tweeked.

     later,
           Dwight


______________________________ Reply Separator _________________________________
Subject: Restore Speeds, continued
Author:  mross (mross AT PSD.COMPUCOM DOT COM) at unix,mime
Date:    1/28/99 1:11 PM


We've done more trial runs on restore speeds, and coming up with worrisome
results. Our setup is:

 IBM 7000 servers
 1gig RAM
 4 x 200MHz CPU's
 DLT3570 tape drive (aka DLT4)
 NT Server 4, SP4
 ADSM v3
 2 x 100mb Ethernet (one card is a dedicated network for backups)

We know we've got network issues, giving us about 1 to 1.2 gig/hr restore
speeds.  I did a trial restore to a local disk on the backup server (thus
not using the network), and got 5.7gig/hr.

Here's the problem- we've got a 260gig EMC box that's on a 24hr recovery
SLA.  Even if we get 5gig/hr over the network, that's 52 hours in tape
restore alone.

1) What restore speeds are other clients getting?

2) Would switching to ArcServe or other non-ADSM software help?

3) Is this reasonable SLA for conventional tape backup & restore? (as
opposed to a mirrored EMC box)


____________________________________________________________
Mitchell Ross                           mailto:mitch.ross AT ncgroup DOT com
CompuCom Systems, Inc.          http://www.ncgroup.com
The Source for Technology Deployment Processes and Standards