That is, you put all drives on all HBA's - you end up with multiple devices per tape drive. Then setup Atape multi-pathing. You define one device file to TSM which it uses. Then the Atape driver will send I/O do whichever of the equivalent devices it deems best. This isn't a disk type load balancing with I/O going down multiple hba's. Rather, when TSM allocates a tape drive, the Atape driver will use the equivalent device on the least used hba. Once allocated, that job will use that specific hba/device. If something happens with that hba or san connection, Atape will failover to one of the other equivalent devices.
Rick -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Prather, Wanda Sent: Monday, October 13, 2014 1:27 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: Load balancing when you have many virtual tapes? Yes, emulating LTO with atape driver. -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Rhodes, Richard L. Sent: Monday, October 13, 2014 1:08 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Load balancing when you have many virtual tapes? What kind of drive are they emulating? Are they emulating IBM drives with Atape driver? My understanding (I've been trusting this for years) will auto load balance across hba's. Rick -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Erwann Simon Sent: Monday, October 13, 2014 12:36 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: Load balancing when you have many virtual tapes? Hello Wanda, As TSM allocates drives in order, you have to distribute drive between the HBAs in a round robin way (with 4 hba : drive 1 on hba 1, drive 2 on hba... drive 5 on hba 1 and so on). I prefer doing this at VTL level using mapping policy (i.e access groups on Data Domain). Le 13 octobre 2014 18:28:36 CEST, "Prather, Wanda" <wanda.prat...@icfi.com> a écrit : >TSM 7.1.1 on AIX >So I have a customer putting in a VTL, which will have 96 virtual >drives. >Those virtual drives will be spread across 4 HBA's. > >What sort of strategies to people use to keep TSM from starting a >BACKUP stgpool process and picking 4 virtual drives all on the same >HBA? >Is it dependent on the order you do your DEFINE DRIVE commands? Better >to set up multiple virtual libraries? > >Any suggestions appreciated. > >Wanda > > >Wanda Prather | Senior Technical Specialist | >wanda.prat...@icfi.com<mailto:wanda.prat...@icfi.com> | >www.icfi.com<http://www.icfi.com/> | 410-868-4872 (m) ICF International >| 7125 Thomas Edison Dr., Suite 100, Columbia, Md >|443-718-4900 (o) -- Erwann SIMON Envoyé de mon téléphone Android avec K-9 Mail. Excusez la brièveté. ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message. ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
