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:[EMAIL PROTECTED] On Behalf Of Paul Fielding Sent: 07 April 2005 07:26 To: ADSM-L@VM.MARIST.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" <[EMAIL PROTECTED]> To: <ADSM-L@VM.MARIST.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 >> * [EMAIL PROTECTED] >> *: 607-751-4133 > Cell : 607-972-7621 >
