Every time I've seen less than 5 GB/hr on backup I get suspicious;  restores
are going to be slower (if only because writing back to client disk takes
longer than reading), our backups generally run at least 20 GB/hr.  We
recently did an  Exchange IS restore, was 16 GB but the upgrade from 5.0 to
5.5 took it down to 12 GB;  the restore took about 35 minutes... this is on
100Mbps Ethernet, AIX-H50 to NT on CompaQ box.

Check your network options (ie, the NIC card) and any switch or hub you're
using;  we seen problems with BayNetworks if AutoSense=On, overcome by
forcing it to 100 Mbps... alternatively, we've seen Cisco switch with
degraded performance with AutoSense=Off --- so it depends on your vendor,
microcode levels, NIC settings (AutoSense on vs. off).  Also, check the
tuning parameters for ADSM --- see online RedBook.



Don France

Technical Architect, P.A.C.E.
San Jose, CA
mailto:dfrance AT pacbell DOT net
PACE - http://www.pacepros.com
Bus-Ph:   (408) 257-3037




> -----Original Message-----
> From: Anders Jacobsen [mailto:AJA AT MERKANTILDATA DOT DK]
> Sent: Monday, February 07, 2000 8:32 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Very slow restore of Exchange 5.5 IS
>
>
> Hey,
>
> I have som problems restoring an 16 Gb Exchange IS. The
> backup vent fine backing
> up at 4 Gb/H pretty good, but restoring i taking a very long
> time. the IS is
> saved directly to the tape. Has anyone seen this behavior
> before. We er talking
> 0,1 time the backup speed when restoring, which is not good enough.
>
> Thanks in advice.
>
> Anders
>