Re: [Networker] Disk to Disk backups.

Snapshot/mirror is great, as far as it goes.  Beware, though - if you
snap/mirror within an array, you're sunk if the array fails, since neither
the original nor the backup are available.  Backup to disk is similar -
putting the data back in the same array isn't protecting it very well.

Backup to disk has a speed advantage for both backup and recovery.  The
savesets could then be staged/cloned to tape for archival storage on a
less-expensive medium.

There are also some file-type device enhancements planned for the next major
release of NetWorker.

Backup-to-disk now requires a separate license.

Wes

-----Original Message-----
From: Terry Lemons [mailto:lemons_terry AT EMC DOT COM] 
Sent: Saturday, August 31, 2002 3:32 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Disk to Disk backups.


We've tested this fairly extensively in our labs, and the NetWorker V6.1
backup-to-disk functionality works well.

There are a number of reasons where doing backups to disk is better than
backup to tape (no shoe shining during incremental backups, for instance).
But, even better than doing a bulk data copy from one disk to another disk,
would be to use a storage array-based feature (like a snapshot or mirror, or
something else) to actually BE the backup.  That would yield a serverless
backup which, in some implementations, would occur within the same array as
your primary data.  No bulk data movement would be necessary over the LAN or
the SAN, in this specific case.

How does that sound?

tl

Terry Lemons
CLARiiON Application Integration Engineering
        EMC²            
where information lives

4400 Computer Drive, MS D239
Westboro MA 01580
Phone: 508 898 7312
Email: Lemons_Terry AT emc DOT com


-----Original Message-----
From: Lancy Quadros [mailto:Quadrosl AT ROTARYINTL DOT ORG]
Sent: Friday, August 30, 2002 4:25 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Disk to Disk backups.


I am looking into replacing our backup gear. Our original project was to buy
a larger tape library, then I came across an article in the Storage magazine
( Jun '02) by Curtis Preston that discussed disk-to-disk backups. The idea
of having to do fast backups and restores on an inexpensive disk array
sounds promising. 

I was wondering if any of you have implemented this scenario in production
and how their experiences (good and bad) have been.

Thanks,

Lancy

--
Note: To sign off this list, send a "signoff" 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" 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" 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.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=