Networker

[Networker] cloning or staging policy for D2D2T architecture

2006-02-17 13:54:47
Subject: [Networker] cloning or staging policy for D2D2T architecture
From: Rich Graves <rgraves AT CARLETON DOT EDU>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Fri, 17 Feb 2006 12:50:19 -0600
I'm designing improvements to a classic situation of slow and unreliable tape-to-tape clones, where some guy takes the clone copies home with him on a [hopefully] regular basis. The goals are improved backup speed, reliability, and disaster recovery abilities. I find that we are dark-fiber-rich, but cash-poor, so the idea is this:

legato server ----5km single-mode fibre channel---- cheap SATA RAID
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local SDLT tape drives

All data center backups go to an advanced file device on the remote SATA trays, immediately off-site. We are in a tornado corridor, so disasters happen, but 5km is considered "probably" far enough. I am sizing the SATA trays to hold only about two weeks' worth of full backups + incrementals because it's just a DR copy, yet I need a *complete* DR copy.

To handle the contingency of SATA RAID failure or a backhoe incident with the fiber, I would like all savesets to be copied "as soon as possible" to the legacy SDLT jukebox that sits in the main data center next to the backup server. I'm aware of the Tao of

I don't think that conventional "Staging" works for me because I don't want the original removed from the media database. I want the data copied from the staging area to tape *quickly*, but I want the originals to be recoverable from disk without running scanner. I guess the alternative is to do cloning rather than staging, but then I need to script the deletion of the originals.

Has someone else already written and debugged such scripts? I kinda need the inverse of the typical nsrclone-and-recycle-old-clones script. Or is there some way to do what I want with the built-in Staging features?

We'll be running NetWorker 7.2.1 on Linux, 4 SDLT-320 drives, Apple Xserve RAID at the other end of long-wave 2G FC transceivers.
--
Rich Graves <rgraves AT carleton DOT edu>

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