ADSM-L

Re: Question on SETUP

2005-04-07 04:25:09
Subject: Re: Question on SETUP
From: Iain Barnetson <Iain.Barnetson AT HALLIBURTON DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 7 Apr 2005 09:24:52 +0100
The value of mirroring even on the same disks is as I see it that if one
of your dbvols or logvols gets corrupted/damaged you have a mirrored
copy.



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Paul Fielding
Sent: 07 April 2005 07:26
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Question on SETUP

I don't see the value in mirroring the db and logs if they're placed on
Shark disk.   The purpose of TSM's mirroring is to provide disk
redundancy
in case of disk failure.   However, the Shark provides it for you.   Why
add
the extra overhead of software mirroring when the hardware does a
valiant job in the background. The Quck Start recommendation doesn't
take into account that your disk is already protected...

regards,

Paul

----- Original Message -----
From: "Jones, Eric J" <eric.j.jones AT LMCO DOT COM>
To: <ADSM-L AT VM.MARIST DOT EDU>
Sent: Wednesday, April 06, 2005 2:56 PM
Subject: [ADSM-L] Question on SETUP


> Good Afternoon.
> I was asked to setup a new TSM server 5.2.2 on a AIX 5.2 server.
> My question has to do with setting up the DB, LOG and DISKPOOL.
> On our current servers which run the same O/S and TSM version the DB, 
> LOG and DISKPOOL are mirrored.
> On the new system I'm setting up these are all going to reside on a 
> IBM
> SAN(SHARK) which is all RAID.
> Is there any reason to mirror them since the mirror would be on the 
> same set of drives(space was already allocated on a LUN)?
> I understand it's always good to mirror(protect DB, LOG, DISKPOOL) but

> in this case I'd have to mirror to the same set of disk since I was 
> only allocated a set of space to work.  In the TSM class it also 
> recommended that you mirror for protection.
> I'm in the middle of reading the "Quick Start" for the second time and

> I see they recommend "Mirror your Database and recovery log for 
> "Server and storage pool protection".  I wanted to make sure there was

> not a performance issue or anything else.
>
> Have a Great Day,
> Eric Jones
>> *  eric.j.jones AT lmco DOT com
>> *:   607-751-4133
> Cell : 607-972-7621
>

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