ADSM-L

Re: Performance Large Fil

2001-02-15 16:16:04
Subject: Re: Performance Large Fil
From: Sam Sheppard <SHS AT SDDPC.SANNET DOT GOV>
Date: Thu, 15 Feb 2001 13:00:45 PST
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>>--> 02-15-01  12:59  S.SHEPPARD     (SHS)    Re: Performance Large Fil
>>--> 02-15-01  12:59  S.SHEPPARD     (SHS)    Re: Performance Large Fil

Jeff:  I'm curious.  What level of OS/390 are you running?

Sam Sheppard
San Diego Data Processing Corp.
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>>--> 02-15-01  11:22  ..NETMAIL     ()     Re: Performance Large Fil
>>--> 02-15-01  11:22  ..NETMAIL     ()     Re: Performance Large Fil
Date: Thu, 15 Feb 2001 14:01:09 -0500
From: "Jeff Connor" <connorj AT NIAGARAMOHAWK DOT COM>
Subject: Re: Performance Large Files vs. Small Files
To: ADSM-L AT VM.MARIST DOT EDU
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Diana,

Sorry to chime in late on this but you've hit a subject I've been
struggling with for quite some time.

We have some pretty large Windows NT file and print servers using MSCS.
Each server has lots of small files(1.5 to 2.5 million) and total disk
space(the D: drive) between 150GB and 200GB, Compaq server, two 400mhz xeon
with 400MB ram.  We have been running TSM on the mainframe since ADSM
version 1 and are currently at 3.7 of the TSM server with 3.7.2.01 and
4.1.2 on the NT clients.

 Our Windows NT admins have had a concern for quite some time regarding TSM
restore performance and how long it would take to restore that big old D:
drive.  They don't see the value in TSM as a whole as compared to the
competition they just want to know how fast can you recover my entire D:
drive.  They decided they wanted to perform weekly full backups to direct
attached DLT drives using Arcserve and would use the TSM incrementals to
forward recover during full volume restore.   We had to finally recover one
of those big D: drives this past September.  The Arcserve portion of the
recovery took about 10 hours if I recall correctly.  The TSM forward
recovery ran for 36 hours and only restored about 8.5GB.  They were not
pleased.  It seems all that comparing took quite some time.   I've been
trying to get to the root of the bottleneck since then.  I've worked with
support on and off over the last few months performing various traces and
the like.  At this point we are looking in the area of mainframe TCPIP and
delay's in acknowledgments coming out of the mainframe during test
restores.

.                                                                      he
.                                                                      er
.

Thanks
Jeff Connor
Niagara Mohawk Power Corp.

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