Re: [Networker] Disk to Disk backups.

I'm sorry Wes,  what is the new backup-to-disk feature/features?  That one
needs a license for file type devices now? :)

I still can't imagine keeping too much of our backups online on disks..
we would need an extraordinary amount of disk space to match the capacity
and slots of our tapes (currently SDLT) and have the data be browsable and
online.

I could envision cloning twice;  once as part of our regular offsite cloning
and another to free up disk space of what was just backed up.

Still I could see if one was setting up a new server; to purchase several
terabytes of disks and a smaller library..   Seems existing customers may
have to purchase disks to take advantage of any new features..

Robert Maiello
Thomson Medical Economics


On Thu, 5 Sep 2002 07:09:36 -0700, Wes Ono <wono AT LEGATO DOT COM> wrote:

>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
>
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