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/
