Let me illustrate our concerns with the Notes Agent by sharing some performance
numbers from a little better than average job run. It has a single 50GB array
for Notes which is 50% full (okay 49.8% really) and half of that is replicated
data from another Notes server, only the replicated data on this server is being
backed up. I do not however have any performance stats for the actual NT server
itself but, we'll probably try to do that sometime soon. The server lists 1508
filespaces for Notes and we're deleting all mail at 30 days, Notes and ADSM,
giving us 230GB of data on the ADSM server.
Bytes Received Last Session: 743.00 M
Bytes Sent Last Session: 404.11 M
Duration of Last Session (sec): 31,104.56
Pct. Idle Wait Last Session: 6.21
Pct. Comm. Wait Last Session: 2.19
Pct. Media Wait Last Session: 0.00
We have larger Notes servers and the time goes to 10-14 hours which just doesn't
work for a backup window. Based on other boxes this size and just using the BA
client to backup the files directly it takes about 4-4.5 hours to do a backup.
The lack of network traffic is nice using the agent but, the twice as long time
to complete interfers in other operations given the desired 8 hour maximum
backup window.
Steve Fletcher <sfletcher AT GIANTOFMARYLAND DOT COM> on 11/12/99 10:16:44 AM
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: Keith A Crabb/SS/HouInd)
Subject: Re: Notes Agent on NT
Keith and John,
While I are not using the Notes Agent I wanted to share my performance numbers
for our Notes backups at the database level. My primary Notes machine has about
35 gig of active data and I pick up some close to that each night. The backups
were taking about 10 hours on v2 and when I recently upgraded to v3 (client and
server) the backups went to 13+ hours. I have done some tuning of the client
parmaters and the window has decreased to 11-12 hours. One of the first things
I changed was changing copy serialization from SHARED DYNAMIC to DYNAMIC. Some
of the Notes databases are huge several 100's of megs and if one new message
hits the file while ADSM is trying to back up the file, it would start over. I
also have started working with the parameters in the client options file to
increase buffering and similar settings.
I am planning to switch to the Agent in the next few weeks to improve
performance though I will do so with a watchful eye on the ADSM database.
John, the idea of weekly database backups and daily incrementals using the agent
is an interesting idea.
Almost forgot, ADSM server is OS/390 running v3.1.2.40 and NT clients are
running 3.1.0.7c. The network is ATM at the clients but must pass through an
FDDI connection to the mainframe.
Good luck!
Steve
John Naylor <John.Naylor AT SCOTTISH-SOUTHERN.CO DOT UK> on 11/12/99 08:23:09 AM
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To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: Steve Fletcher/GIANTMD/US/Ahold)
Subject: Re: Notes Agent on NT
Hi, Keith
We seem to have a similar set up to yourself.
OS390 host running ADSM 3.1.2.40 and backing up 9 Notes servers on 3.1.0.6
We have started backing up inititially at the database level using the backup
client and dynamic serialization in the copygroup.
We intend to progress to weekly backups using this process and daily
incrementals using the agent.
The performance we have seen so far backing up at the database level is awful
ie. 1.84 gb in 8 hours for 1 Notes server .
This was for 4800 objects inspected and 418 objects backed up.
The client spent over 99% of its time in commwait. Any thoughts on how we could
improve this.
I would not personally therefore recommend doing all your backups at the
database level.
We do not ourselves back up the replicatation directories. Have you a reason for
this ?
Has anybody any thoughts on the sort of performance we should be able to achieve
backing up Notes.
"Keith A. Crabb" <keith_a_crabb AT RELIANTENERGY DOT COM> on 12/11/99 00.20.53
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To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: John Naylor/HAV/SSE)
Subject: Notes Agent on NT
Would anyone be willing to discuss their experiences with the Notes Agent on NT
with me and one of our Notes Admins? We've tried our local Tivoli rep and they
don't have a referral list apparently. We seem to be suffering some performance
problems with the Notes Agent, like it taking 10-12 hours to do an incremental
and they are only taking about 20GB of data.
I'm pretty sure its faster to just backup the replicated Notes files for users
with plain ADSM (well we're stilling run 3.1.2.20) than use the Agent right now
(and we have 10-12 Notes boxes here) but I'd like to at least talk to someone
else before I make that dramatic of a change for that many servers.
Keith A. Crabb
Reliant Energy
713-207-2051
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