Our current situation is MOD 3 for Z/VSE and z/VM and MOD 9 for zlinux We will be migrating to an new DS8800 and we are still discussing about how we will use our drives. We will probably do something like this. We have ordered HyperPAV licensing for the SAN:
MOD3: For linux swap disks and VM paging disks. MOD 9: Linux system disks MOD 27: disks for logical volumes. We are still running SUSE 10 that doesn't support HyperPAV. So we will still use MOD 9 for the logical volumes in production until we migrate to SUSE 11 and when we have tested the performance implications of going from MOD 9 to MOD-27 with PAV (Theoritically it should give better performance, but better to be safe than sorry) For the development, test and acceptance machines we will start using MOD 27 with normal PAV. You should definitly check out hyperPAV. The extra license price was in our case peanuts considering the potential performance boost. And hyperPAV doesn't need any configuring in SUSE 11, so no extra work there. Best regards Samir Reddahi From: Ron Foster at Baldor-IS <[email protected]> To: [email protected] Date: 13/01/2011 20:42 Subject: Advice on setting up minidisks Sent by: Linux on 390 Port <[email protected]> Hello list, This may have been discussed before... Way back in deep dark ancient history, we used the Redbook to get started with Linux under z/VM. As a result, we carved up our storage subsystem in to a bunch of mod3 drives. We put a few mod 9 drives in the mix. We added drives to a guest in standard chunks. That is when storage was needed by a Linux system, we added a mod9 or mod3 to it. When that Shark went off lease and we moved to a DS8000, we pretty well kept the same philosophy. Only we added a bunch more mod3 and mod 9 drives. We are a SAP shop and any large databases reside in DB2 on z/OS. There are a few large file systems on 3 or 4 of our Linux systems, but for the most part the drives attached to a Linux system go something like this. A boot drive. One to several mod3 drives for swapping (the appropriate ones have vdisks). One to several mod3 or mod9 drives for the SAP code and local files. We are moving our production drives. We finally have gotten our production Linux systems where about half or do very little swapping. We do not have dirmaint, so we keep up with disk allocations with dirmaint and a spreadsheet. Now time has come to migrate to another storage system. I was wondering what other folks do. 1. Do they have a whole bunch of mod9 and mod3 drives that they allocate to their guests? 2. Do they take mod27 drives (someone at SHARE warned me about taking mod54 drives) and use mdisk to carve them up into something smaller. Any input would be appreciated. Thanks, Ron Foster ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ - Confidentiality Notice - This communication and the information it contains is intended (a) for the person(s) or organization(s) named above and for no other person or organization, and (b) may be confidential, legally privileged and protected by law. Unauthorized use, copying or disclosure of any of it may be unlawful! If you receive this communication in error, please notify us immediately, destroy any copies and delete it from your computer system. Please consult our disclaimer on our site www.securex.eu Thank you. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
