Networker

Re: [Networker] Query in Staging from adv_file

2008-08-19 23:49:40
Subject: Re: [Networker] Query in Staging from adv_file
From: Preston de Guise <enterprise.backup AT GMAIL DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Wed, 20 Aug 2008 13:46:36 +1000
On 20/08/2008, at 1:27 PM, Curtis Preston wrote:
<snip>
I think the concurrent restore thing is a red herring. Sure, you can't do two restores at once from a tape, but:

1. Most people don't do more than one restore a month, let alone more than one a day, let ALONE two at the same time. 2. Add to that the odds that the two restores you do at the same time would need the same tape at the same time. (Multiplexing would increase the chances, but one should not multiplex to virtual tapes.) 3. If you want better odds, just use smaller virtual tapes. It costs you nothing, adds no management issues (like more AFTDs do), and significantly decreases the chance that two restores would be grabbing for the same tape.

<snip>

This is certainly a good indication that we have user groups with wildly varying requirements. While I have some users that fall into the above category - rare restores, I've equally had plenty that *frequently* recover - yes, the 400-600+ recoveries per day customer that I mentioned previously was atypical (in fact, it was effectively using NetWorker for HSM - and when I logged a support call about it once the Legato tech thought I'd added an extra 0 onto the end of both figures...), but I've had plenty where 10-20 recoveries per day is the norm.

However, I certainly remain hopeful of seeing some changes to AFTD in NetWorker Real Soon Now, as it's starting to get annoying that we still can't:

- Run multiple stage operations
- Run multiple clone operations
- Failover a saveset from one DBU to another if it fills
- Better balance backups so that a small number of DBUs see a disproportionate number of backups due to 'archaic' tape based volume selection algorithms

Cheers,

Preston.

--
Preston de Guise


"Enterprise Systems Backup and Recovery: A Corporate Insurance Policy", due out September 17 2008:

http://www.crcpress.com/shopping_cart/products/product_detail.asp?sku=AU6396&isbn=9781420076394&parent_id=&pc=

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