ADSM-L

Re: HELP! Faster Restore than Backups over Gigabit?

2002-10-30 00:08:55
Subject: Re: HELP! Faster Restore than Backups over Gigabit?
From: "Seay, Paul" <seay_pd AT NAPTHEON DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 30 Oct 2002 00:02:14 -0500
Actually, the 2048 TCPWINDOWSIZE is not supported in NT to my knowledge.  It
is supported in W2K at SP1 or 2, cannot remember, with a registry hack.
Someone else will have to give the particulars on that.

Be careful comparing restores to backups.  Depending on what numbers you are
using, you may get the wrong conclusions.  Make sure it is the same files
backed up that were restored.  Also, look at where your backup is going to
on your server.  If it is going to RAID-5 storage pools, that is it.  The
write penalty on the RAID-5 Array is the cause of the backup delay.  If you
are going directly to tape, I do not know what the issue is without a lot
more information.

Paul D. Seay, Jr.
Technical Specialist
Naptheon Inc.
757-688-8180


-----Original Message-----
From: Vin Yam [mailto:vyam AT QBCT DOT COM]
Sent: Tuesday, October 29, 2002 7:16 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: HELP! Faster Restore than Backups over Gigabit?


Hi,

We just installed Gigabit fiber NICs and an isolated gigabit fiber switch.
Our restores have increased dramatically from 31.81 GB/hr (8.84 MB/s) to 56
GB/hr (15.6 MB/s).  The backups are still around 35.5 GB/hr (9.8 MB/s).  The
TSM server is very powerful (NT 4.0 SP6a Dual 1.8 Ghz P4 w/ 4GB RAM, 150 GB
RAID array) and the clients are (Netware 4.2 Quad XEON P3 w/ 4 GB RAM).
(We've tried changing the TCPWindow Size in our dsmserv.opt from 63 to 2048
with no effect) We're running TSM 5.1.1.4 server and TSM 4.2.3 netware
client.   Any
ideas?  Please email me direct if you have any suggestions or need more
information.  Thanks.

DSM.OPT settings

** TSM TWEAKS **
COMPRESSION NO
LARGECOMMBUFFERS YES
MEMORYEFFICIENTBACKUP NO
PROCESSOR 20
RESOURCEUTILIZATION 10

TXNB 2097152

TCPB 32
TCPNodelay YES
TCPWindowsize 64
** TSM TWEAKS **

managedservices schedule webclient
schedmode prompted

-Vin
vyam AT qbct DOT com