ADSM-L

Re: TDP Restoration Process.

2002-11-22 10:44:46
Subject: Re: TDP Restoration Process.
From: Del Hoobler <hoobler AT US.IBM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 22 Nov 2002 10:41:35 -0500
Brian,

Is it truly hung... or is the Domino recovery manager
still replaying transactions against the database?
This sounds like it is taking too long to me, assuming you
have a fast network and fast machine applying the logs.
If it is hung... then that is a different issue that
should probably be taken up with service.

As far as speeds... here is an *example* of some of our
internal IBM Domino servers and the setup and throughput speeds:

Domino server info:
===================
- RS/6000 SP wide nodes,  4x332 Mhz cpu, 3GB RAM, SSA DASD (10,000 rpm)
- ATM connection to TSM server
- Avg 200 GB data/1500 users per domino server
  (some as large as 350 GB total data)
- avg 22-23 txn logs archived per server per day
  => ~1.5GB/day/domino server
- avg 58-60 txn log archived per server per day (no archiving on Sunday)
- 4 to 6 domino servers per TSM server  (backup in parallel)

TSM server info:
================
- RS/6000 SP thin nodes, 4x375 Mhz cpu, 4GB RAM,
  700GB SSA (non-raid) dasd, scsi attached 3494 with 4x3590 E1A tape drives
- backup to disk pool  (some directly to tape)
- archived txn logs maintained on disk for 2 days

Procedure and Throughput info:
==============================
- Full backups 3 times/week  (Sun, Tue & Thurs)
- multiple TDP client sessions per domino server
- Incremental backups nightly when not full backup
- Txn Log Archives scheduled every hour with threshold
  option ONLY on DB servers
- Txn Log Archives scheduled as below
  (threshold option is only on dB server not on Mail servers)
                 0 6,10,14,18,22 * * 1-6
- Full backups complete within 4.5 hours
  (aggregate ~ 220 GB/hr per TSM server assuming ~ 1TB per TSM server)
- Restores of single mailboxes done to alternate server
- 900 MB mail file+roll forward through 2 days worth
  of txn logs in 7-10 minutes
- 7 to 9 MB/sec restore throughput
- 12 to 14MB/sec restore throughput

I hope this helps give you an idea of speeds that
can be obtained.

Standard Disclaimer: The above information is not a guarantee
of the speeds you should get but merely an example of
a real working configuration and setup.

Thanks,

Del

----------------------------------------------------

Del Hoobler
IBM Corporation
hoobler AT us.ibm DOT com

- Never cut what can be untied.
- Commit yourself to constant improvement.

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