On VM 5.2 I'm considering trying FBA emulation on SCSI for Linux guests to simplify each Linux guest's configuration and save staff time.
If the additional CPU overhead doesn't hurt much it'll be worth it. Using VM's FBA emulation on SCSI: * You don't have to configure scsi multi-pathing, I/O load balancing and path failover separately on each Linux guest (not to mention researching and experimenting how to do that). Can just keep using the Linux dasd device driver instead and let CP do the extra work. * You don't need to implement the LUN Access Tool to restrict a guest to its designated LUNs. Ordinary VM directory mdisk rules can be used. * You can still backup Linux FBA mdisks from VM using your normal backup tools. -------------------------------------------------------- This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -----Original Message----- From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] On Behalf Of Rob van der Heij Sent: Wednesday, March 15, 2006 9:39 AM To: VMESA-L@LISTSERV.UARK.EDU Subject: Re: DASD I/O performance VM 44 vs. VM 52 On 3/15/06, Stefan Raabe <[EMAIL PROTECTED]> wrote: > I now read about the emulated FBA on SCSI that cones with vm 5.1 which gives some > improvement in comparison with vm44, but there are no more i/o improvements in the vm 5.1 > performance report. You don't want to do FBA emulation on SCSI if you are concerned about I/O performance. That has not been the focus area for this support. Rob -- Rob van der Heij Velocity Software, Inc
