A full set of benchmarks for different disk technologies with z/VM: http://www.vm.ibm.com/perf/reports/zvm/html/520dasd.html
On Fri, Mar 11, 2011 at 12:57 PM, Donald Russell <[email protected]>wrote: > I currently have a dozen or so RHEL 5.6 zLinux running on multiple VM 6.1 > (well, 5, but 6.1 RSN), on z10 processors. > > The largest (disk space) is about 3TB and is currently FBA/SCSI.... > > We're thinking of changing this to ECKD to take advantage of the SAP to do > the real IO, instead of IO being handled within zLinux itself. > > (We have other zLinux system using ECKD) > > On one hand using ECKD will get us some CPU cycles back due to more work > being done by the SAP, but just recenly I heard that IO can be faster > (higher throughput) with FBA/SCSI. > > I'm assuming there's no clear answer as to which is best, because like so > many performance tuning things, the answer is always "it depends". > > But, what are other people doing? My experience so far seems to be that the > choice of SCSI or ECKD depends on the background of the people making the > decision.... people with a s390 background are familiar with ECKD, people > coming from a unix/linux background are familiar with SCSI.. > > 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/ > ---------------------------------------------------------------------- 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/
