ADSM-L

Re: [ADSM-L] backups direct to tape

2009-02-24 09:23:59
Subject: Re: [ADSM-L] backups direct to tape
From: Fred Johanson <Fred AT UCHICAGO DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 24 Feb 2009 08:21:58 -0600
In our experience, when we turned on simultaneous writes for the Lanfree 
stgpool, the backups went to the network.

Fred Johanson
TSM Administrator
University of Chicago

773-702-8464

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Kelly Lipp
Sent: Monday, February 23, 2009 5:44 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] backups direct to tape

I don't think the comment that simultaneous writes won't work for LAN Free.  
The simultaneous write thing happens at the storage pool level (copystg= 
parameter).

Kelly Lipp
CTO
STORServer, Inc.
485-B Elkton Drive
Colorado Springs, CO 80907
719-266-8777 x7105
www.storserver.com


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Paul Zarnowski
Sent: Monday, February 23, 2009 4:31 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] backups direct to tape

Also, are these RMAN backups?  If so, they use the API.  I'm not sure if
simultaneous write works for the API.  Anyone know?  Also, RMAN supports
multiple tape streams.  We are setup to use 4 parallel streams.  We used to
use physical tape, but now the backups just go to serial disk volumes
(devclass=file).  The DBAs here are happy with that.       ..Paul

At 06:14 PM 2/23/2009, Fred Johanson wrote:
>The big gotcha here is that you cannot use the simultaneous write feature
>if the backup is going lanfree.
>
>________________________________________
>From: ADSM: Dist Stor Manager [ADSM-L AT VM.MARIST DOT EDU] On Behalf Of Kelly
>Lipp [lipp AT STORSERVER DOT COM]
>Sent: Monday, February 23, 2009 1:28 PM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: Re: [ADSM-L] backups direct to tape
>
>Gill,
>
>I will start by asking: What do you think happens?  The cool thing about
>TSM is it will usually do what you think it will do.  If a tape error
>occurs, the current transaction (whatever it happens to be) will fail.
>What that means will vary.  In the case of a client/agent backup, a write
>error on a tape will cause TSM to mount another tape and restart the
>failed transaction. Data integrity is the hallmark of the product.
>
>Direct to tape backups are actually cool. In fact, you can write two tapes
>simultaneously: the onlinepool and the drpool volumes.  This avoids having
>to migrate data from disk to tape and having to back that data up.  In the
>case of a 500GB database that will reduce the amount of data flowing
>through your server from 1.5TB to 500GB.  Huge savings.  And the write to
>two tapes happens at the same speed as to one.
>
>Kelly Lipp
>CTO
>STORServer, Inc.
>485-B Elkton Drive
>Colorado Springs, CO 80907
>719-266-8777 x7105
>www.storserver.com
>
>
>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
>Gill, Geoffrey L.
>Sent: Monday, February 23, 2009 11:28 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: [ADSM-L] backups direct to tape
>
>I have a question that I hope those using TSM to back up direct to tape
>can answer. We don't, and never have, done this here and I'm not looking
>to implement it either. I am really looking for information as to "what
>happens to the backup" is a tape error occurs. (I just know I'm going to
>get this question when the dba's who have convinced everyone netbackup
>and direct to tape is so great) I am interested too if the TSM agents
>have the ability to compensate for this compared to a standard client
>backup. Will the agent take this into consideration and continue the
>backup with a different tape or will it die? The same question applies
>to the standard backup.
>
>
>
>Thanks for your help.
>
>
>
>
>
>Geoff Gill
>TSM Administrator
>PeopleSoft Sr. Systems Administrator
>SAIC M/S-G1b
>(858)826-4062 (office)
>
>(858)412-9883 (blackberry)
>Email: geoffrey.l.gill AT saic DOT com


--
Paul Zarnowski                            Ph: 607-255-4757
Manager, Storage Services                 Fx: 607-255-8521
719 Rhodes Hall, Ithaca, NY 14853-3801    Em: psz1 AT cornell DOT edu

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