FYI, per the TSM manual, raw filesystems should *not* be used in a file-based disk pool. At this time, file-based disk pools are the way to go with SATA disks (performance-wise).
-- Mark Stapleton ([EMAIL PROTECTED]) IBM Certified Advanced Deployment Professional Tivoli Storage Management Solutions 2005 IBM Certified Advanced Technical Expert (CATE) AIX Office 262.521.5627 >-----Original Message----- >From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On >Behalf Of Leigh Reed >Sent: Wednesday, August 17, 2005 5:16 PM >To: ADSM-L@VM.MARIST.EDU >Subject: Re: AW: [ADSM-L] Migration Speed Has Plummeted > >Joni, > >If you read Ben Bullock's recent posting, I agree with >everything he has >said. I would definitely use raw disk volumes (in a Unix world). > > >Leigh > >-----Original Message----- >From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On >Behalf Of >Joni Moyer >Sent: 17 August 2005 20:31 >To: ADSM-L@VM.MARIST.EDU >Subject: Re: [ADSM-L] AW: [ADSM-L] Migration Speed Has Plummeted > >Hi Leigh, > >I have just added EMC fibre channel disk from a CX700 in the following >pieces of physical disk under the filesystem /tsmdev/stgpool1 > >CHRS044 /tsmdev/stgpool1 > >lun 175 100 GB >lun 178 100 GB >lun 181 100 GB >lun 184 100 GB >lun 187 100 GB >lun 190 100 GB >lun 193 100 GB >lun 199 100 GB >lun 204 100 GB >lun 210 100 GB > >Total 1000 GB > >When you stated using many small TSM disk storage pool volumes, would >anyone happen to know what a good, acceptable size TSM volume would be? >Thanks! > >******************************** >Joni Moyer >Highmark >Storage Systems >Work:(717)302-6603 >Fax:(717)302-5974 >[EMAIL PROTECTED] >******************************** > > > > "Leigh Reed" > <[EMAIL PROTECTED] > > >To > Sent by: "ADSM: ADSM-L@VM.MARIST.EDU > Dist Stor >cc > Manager" > <[EMAIL PROTECTED] >Subject > .EDU> Re: AW: [ADSM-L] Migration Speed > Has Plummeted > > 08/17/2005 10:39 > AM > > > Please respond to > "ADSM: Dist Stor > Manager" > <[EMAIL PROTECTED] > .EDU> > > > > > > >Joni > >The following URL is to the TSM V5.3 Technical Guide Redbook. > >If you go to section 3.4.6, it discusses some changes in TSM 5.3 that >lend themselves to 'disk only backups' >Obviously, if you're not at 5.3 yet, then they may not be of >use to you. > >I personally would consider SATA disk as a possible replacement to >sequential tape, but I would still use good quality fast disk as >traditional 'random' disk pool to stage the nightly backups. I think >that it is widely recognised that significantly 'slicing up' the >diskpool into a large number of smallish volumes, greatly improves >performance (certainly on the backup). I believe that this is >because of >the 'multi-threaded' nature of TSM. > >I would imagine that the config for the best performance of >SATA disk as >random TSM backuppool, would be to configure each SATA disk as a single >TSM volume within the backuppool and ensure that you have enough SATA >disks/backuppool volumes as you have sessions in at the same time. > >However, with SATA disk capacity increasing rapidly, it's not efficient >to have a 100 x 250GB SATA disks (100 TSM volumes) sitting in your >backuppool, that only ever get 10% utilised. > >I must state that this is just my opinion, I have no direct experience >with SATA disks. > >Leigh >
