Re: [Networker] How do I minimize recovery time?

I had a similar dilemma that I had to work through.  Are you talking
about a complete environmental DR restore or a single/group (of)
server(s) (I assume the whole shi-bang)?

The higher your sessions and paralellism, the quicker your backup, the
slower your restore.  There is no "optimum" paralellism or sessions
settings as the variables can be huge (LAN speeds, file sizes, number of
files), so you must play and find your optimum.

What I have done is thoroughly optimize our backups and restores through
a lot of testing.  As a result, key servers backup at a paralellism of #
of savesets times the number of drives (sessions set to 1) allocated to
the pool.  For lower priority servers, I increase paralellism and
sessions so that backup and restore times are both acceptable to meet
SLAs.

How many clients, pools

-----Original Message-----
From: Jody Gregersen [mailto:Jody.Gregersen AT VISHAY DOT COM] 
Sent: Tuesday, June 17, 2003 4:58 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] How do I minimize recovery time?


Hi,

I'm running Legato 6.1 using Tru64 5.1a on an ES40 attached to an
ESL9326 jukebox with 8 TL891 drives.  We are setting up for a DR test
and I would like to have the shortest recovery time possible.  We run
separate backups rather than cloning.  We can get about 500 GB backed up
in about 5.5 hours using a parallelism of 32 and 8 target sessions per
drive (8 streams running to 4 tapes simultaneously).  To restore this
setup takes about 24 hours.  If I run with a parallelism of 16, the
backup takes about 8.5 hours.  We haven't tried a restore from those
tapes.  Does anyone know of an "optimum" parallelism for restoring or
some equation that could be used to determine what a restore time might
be?

Thanks,

Jody

Jody Gregersen
Infrastructure Engineer
Vishay Intertechnologies, Inc.

--
Note: To sign off this list, send a "signoff networker" command via
email to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can also
view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=