---------------------------- Top of message ---------------------------- >>--> 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. -----------------------------------------------------------------------` ---------------------------- Top of message ---------------------------- >>--> 02-15-01 11:22 ..NETMAIL () Re: Performance Large Fil Date: Thu, 15 Feb 2001 14:01:09 -0500 From: "Jeff Connor" <[EMAIL PROTECTED]> Subject: Re: Performance Large Files vs. Small Files To: [EMAIL PROTECTED] _________________________________Top_of_Message_________________________________ 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. -----------------------------------------------------------------------`
