David, One question/observation. Ignoring PAV on the ESS or equivalent, there can still be only one physical I/O going to a physical volume (as seen by VM). Therefore, when using the MDISK in this fashion, it is a good idea to put the different MDISKs on separate physical volumes. Is this still true? I'm not as familiar with VM I/O as I am with z/OS. But I think this is still a hardware restriction.
-- John McKown Senior Technical Specialist UICI Insurance Center Applications & Solutions Team +1.817.255.3225 This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its' content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. > -----Original Message----- > From: David Boyes [mailto:[EMAIL PROTECTED] > Sent: Wednesday, March 26, 2003 1:48 PM > To: [EMAIL PROTECTED] > Subject: Re: minidisk vs. dedicate > > > Yeah, that's what I assumed. I'm suggesting breaking the full volumes > into several smaller parts (say 3 1000 cylinder chunks) and > aggregating > the smaller chunks with LVM. You end up with more effective spindles, > which allow more I/Os to be in flight at the same time for the same > filesystem. Works really well, especially for databases with fairly > random query patterns. > > -- db > > David Boyes > Sine Nomine Associates > > > >
