Re: Question about LanFreeBackup
2006-10-16 14:43:01
Fran
What is your suggestion of the size for the buffpoolsize parameter on a 2 GB
memory server and LTO2 TAPES
Regards
Robert Ouzen
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Francisco Molero
Sent: Monday, October 16, 2006 8:28 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Question about LanFreeBackup
In my opinion, you can get great performance with LTO3 and aplications like
db2, Oracle, SAP, Domino, Exchange, etc. It is a good idea if you want to
backup big files. I don't recommend you if you want to backup fileservers.
I have found differents performance. The best one was 1,5 TB y 1:30 minutes
using LTO3 and DS8100, SAP with Oracle and AIX.
The best parameters in TSM 5.3 are the defaults, Only you have to change the
buffpoolsize in the server. The best communication method in TSM 5.3 is
sharedmem.
I hope this help you.
Regards,
Fran
TSM deployment certified.
TSM administrator certified.
ITIL Certified.
AIX Certified.
----- Mensaje original ----
De: Mark Stapleton <margek.s AT EVOLVINGSOL DOT COM>
Para: ADSM-L AT VM.MARIST DOT EDU
Enviado: lunes, 16 de octubre, 2006 20:01:51
Asunto: Re: Question about LanFreeBackup
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Anker Lerret
>> Remember that LAN-free backups are often no faster than 100MB/1GB
>> Ethernet LAN-based backups. (In a few cases they will actually be
>> slower.)
>
>Mark, can you say some more about that? We're hoping to start doing
>LAN-free and I was hoping that we could see some nice improvements in
>large backups that go straight to tape. Are you just talking about the
>case where the LAN is relatively uncongested and the SAN is overloaded?
>Or is there something else I'm missing?
I can't say that I've got quantifiable data; I speak from real-world
experience. SAN-based data transfer from disk to tape has been, in the best of
situations, only slightly faster than similar LAN-based data transfer. As I
said earlier, the only advantages I've ever seen to LAN-free backups have been
1. where the LAN is too congested (or poorly configured) to guantee reasonable
backup speeds 2. the disk storage pool is too small to handle large file
backups.
3. you want to guarantee that an entire node's backups go directly to tape
--
Mark Stapleton (mark.s AT evolvingsol DOT com)
Senior TSM engineer
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