On Tuesday, 03/20/2012 at 02:06 EDT, Grzegorz Powiedziuk <gpowiedz...@gmail.com> wrote: > I found a lot of very useful information here but this time I have some > doubts so I decided to subscribe and ask. > > Recently we upgraded our hardware (z9 + DS6000 -> z114 + DS6000 + XIV) and > we have to make some choices. > There is a chance that at some point we will have to get rid of DS6000 and > we will have to store store everything on XIV. > I know that it is not best choice for z/vm but DS is a pretty old guy and > maintaining it may become expensive.
I always suggest having both ECKD (for "z/VM data") and SCSI (for "Linux data"). The ability to create large LUNs and the raw speed of data transfer via FC make SCSI ideal for databases. SCSI-only configurations require some consideration: - You can't use the new Single System Image feature - You can't share the RACF database (not even with other VM systems) - z/OS can't provide any backups (FDRSOS with DS8000 can, but that's not your config) - No hyperswap capability - Rudimentary performance instrumentation for the devices - Increased CPU consumption for EDEVs If you don't have any of those concerns, then SCSI-only is an easy choice. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu 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/
