My experience (briefly): 1) Easiest to manage, least issues with DR or moving to different processors. Physical backups can be taken using z/VM or z/OS storage utilities. Same for cloning images... 2) NPIV required for any real storage security. Managed by fcp/wwpn/lun - nowhere near as easy as a 3390 volume label and minidisk address. Complicates DR and moving as FCP/WWPN/LUN must be considered/solved. No mainframe storage utilities. Storage typically managed by non-mainframe folks and there can be techno language barriers. You can get much bigger chunks of storage then on 3390 but should still manage using LVM for growth. 3) This is fairly common.. The 'system' on 3390 DASD - the application data on SAN/SCSI. You can use 3390 based recovery methods for the system piece.. then use various methods to restore (or reconnect to) the application data on external storage. You still bring all the complications of #2 with you but can simplify the core system/server piece. 4) EDEV -- you centralize the complications of FCP/WWPN/LUN in one place (CP) so that your zLinux guests don't need to -- FBA minidisks can be managed just like on 3390 - and the data is available to the host (z/VM) system and other guests via LINK. There is a performance cost for emulation.. and the multi pathing is probably not as robust as on zLinux (?). 5) Combination of EDEV and directly attached FCP (for key guests where performance/size makes directly attached a better choice).
If I need to use SCSI - my own preference is for EDEV .. if I have 3390 available then I prefer z/VM to be on 3390 and the zLinux guests to use EDEV minidisks. Others may (probably) have very different views.. Scott Rohling On Mon, Aug 15, 2016 at 7:49 AM, Gentry, Steve < [email protected]> wrote: > There are at least 3 combinations of DASD usage for Linux implementation. > They are: > > 1) Everything on 3390 storage > > 2) Everything on non-3390, external disk via a fiber card > > 3) A combination of 1 & 2 > > > > What are the thoughts on using these? Is one preferred over the other? > > Thanks, > > Steve > > > > ---------------------------------------------------------------------- > 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/ > ---------------------------------------------------------------------- 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/
