ADSM-L

Re: Question about LanFreeBackup

2006-10-18 05:22:58
Subject: Re: Question about LanFreeBackup
From: Matthew Warren <Matthew.Warren AT DIGICA DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 18 Oct 2006 10:21:43 +0100
I wouldn't simply use the figure from the tuning guide. The buffpool size is 
useful in increasing performance through upping the database cache hit %, which 
should ideally be over 98%.

http://www.tsmwiki.com/tsmwiki/CacheHitPct 

Matt.

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] 
> On Behalf Of Francisco Molero
> Sent: 16 October 2006 20:08
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: [ADSM-L] Question about LanFreeBackup
> 
> From performance and tunning guide:
> 
> 262144
> 
> ----- Mensaje original ----
> De: Robert Ouzen Ouzen <rouzen AT UNIV.HAIFA.AC DOT IL>
> Para: ADSM-L AT VM.MARIST DOT EDU
> Enviado: lunes, 16 de octubre, 2006 20:39:38
> Asunto: Re: Question about LanFreeBackup
> 
> 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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> 
> 
>               
> ______________________________________________ 
> LLama Gratis a cualquier PC del Mundo. 
> Llamadas a fijos y móviles desde 1 céntimo por minuto. 
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> 
>  
> 


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