Paging subsystem
I got a great Christmas present! 8G dedicated to our new z/VM and zLinux pilot and new ficon attached DASD (9990V) to replace the escon DASD. The new DASD has both mod3 and mod9. As an old MVS dinosaur I'd create many different paging volumes on smaller disk (mod3) but there is some pressure to use the mod9's. It is a pilot so I have no idea what our load is going to look like. Obviously my mileage may vary but what is in use out there? Any thoughts, good or bad, about a mod9 for paging other than the possibility of contention? Thanks Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474
Re: Paging subsystem
q alloc page EXTENT EXTENT TOTAL PAGES HIGH% VOLID RDEV STARTEND PAGES IN USE PAGE USED -- -- -- -- -- -- 530PAG 095E 1 3338 600840 0 0 0% -- -- SUMMARY 600840 0 0% USABLE600840 0 0% Ready; T=0.01/0.01 11:14:03 Ed Martin Aultman Health Foundation 330-588-4723 ext 40441 -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Bauer, Bobby (NIH/CIT) [E] Sent: Wednesday, December 10, 2008 11:10 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Paging subsystem I got a great Christmas present! 8G dedicated to our new z/VM and zLinux pilot and new ficon attached DASD (9990V) to replace the escon DASD. The new DASD has both mod3 and mod9. As an old MVS dinosaur I'd create many different paging volumes on smaller disk (mod3) but there is some pressure to use the mod9's. It is a pilot so I have no idea what our load is going to look like. Obviously my mileage may vary but what is in use out there? Any thoughts, good or bad, about a mod9 for paging other than the possibility of contention? Thanks Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474
Re: Paging subsystem
VM Paging volumes should be WHOLE thingies, whatever it is on, us the who le thing. I would go for multiple MOD3 volumes with some spares to add later if/whe n you need them. Use MOD9s for real data volumes. /Tom Kern On Wed, 10 Dec 2008 11:09:56 -0500, Bauer, Bobby (NIH/CIT) [E] [EMAIL PROTECTED] wrote: I got a great Christmas present! 8G dedicated to our new z/VM and zLinux pilot and new ficon attached DASD (9990V) to replace the escon DASD. The new DASD has both mod3 and mod9. As an old MVS dinosaur I'd create many different paging volumes on small er disk (mod3) but there is some pressure to use the mod9's. It is a pilot s o I have no idea what our load is going to look like. Obviously my mileage ma y vary but what is in use out there? Any thoughts, good or bad, about a mod 9 for paging other than the possibility of contention? Thanks Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474 = ===
Re: Paging subsystem
IF you end up paging heavily, THEN you want many volumes AND you want the volumes on separate RAID arrays as possible. After that...my guess is if you have, say, 4-6 mod-3s per array, it might be time to move to less mod-9s. But if you are really in that much paging, add more memory. On a z10 it is much less expensive. On the other boxes, look at the used market. Of course if you have sufficient disk space to waste, use mod-9s and add more when they are 10-15% full. (Some shops make stupid IMHO rules like everything must be mod-9s, but there are a limited number of addresses in the dasd subsystem, and disk drives can be very large). Tom Duerbusch THD Consulting Bauer, Bobby (NIH/CIT) [E] [EMAIL PROTECTED] 12/10/2008 10:09 AM I got a great Christmas present! 8G dedicated to our new z/VM and zLinux pilot and new ficon attached DASD (9990V) to replace the escon DASD. The new DASD has both mod3 and mod9. As an old MVS dinosaur I'd create many different paging volumes on smaller disk (mod3) but there is some pressure to use the mod9's. It is a pilot so I have no idea what our load is going to look like. Obviously my mileage may vary but what is in use out there? Any thoughts, good or bad, about a mod9 for paging other than the possibility of contention? Thanks Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474
Re: Paging subsystem
We are on DS8100, so we created a bunch of 3390-1s for paging. Bob. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duerbusch Sent: Wednesday, December 10, 2008 11:01 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Paging subsystem IF you end up paging heavily, THEN you want many volumes AND you want the volumes on separate RAID arrays as possible. After that...my guess is if you have, say, 4-6 mod-3s per array, it might be time to move to less mod-9s. But if you are really in that much paging, add more memory. On a z10 it is much less expensive. On the other boxes, look at the used market. Of course if you have sufficient disk space to waste, use mod-9s and add more when they are 10-15% full. (Some shops make stupid IMHO rules like everything must be mod-9s, but there are a limited number of addresses in the dasd subsystem, and disk drives can be very large). Tom Duerbusch THD Consulting Bauer, Bobby (NIH/CIT) [E] [EMAIL PROTECTED] 12/10/2008 10:09 AM I got a great Christmas present! 8G dedicated to our new z/VM and zLinux pilot and new ficon attached DASD (9990V) to replace the escon DASD. The new DASD has both mod3 and mod9. As an old MVS dinosaur I'd create many different paging volumes on smaller disk (mod3) but there is some pressure to use the mod9's. It is a pilot so I have no idea what our load is going to look like. Obviously my mileage may vary but what is in use out there? Any thoughts, good or bad, about a mod9 for paging other than the possibility of contention? Thanks Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474 This electronic transmission and any documents accompanying this electronic transmission contain confidential information belonging to the sender. This information may be legally privileged. The information is intended only for the use of the individual or entity named above. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or the taking of any action in reliance on or regarding the contents of this electronically transmitted information is strictly prohibited.
