Hi, I have a question here on z/VM minidisk cache.
By default, z/VM minidisk cache is enable. As I know, z/VM minidisk cache is using z/VM real memory and expanded storage. Would anyone recommend to use minidisk cache on z/VM where the main purpose of z/VM here is to support Linux guests? Today's DASD technology has fast write, which means that writing to DASD will no longer write direct to the disk, however, it will write direct to the cache (which is memory) of the DASD controller. In view of this fast write feature, is minidisk cache still relevant? If it is still relevant, does the z/VM minidisk cache work well to predict open system I/O characteristics in view that I/O pattern of open system is random (not sequential) as compared to MVS ?? Here are some statistics (By default, MDC *LIMIT* on storage and xstore are not set) q mdcache Minidisk cache ON for system Storage MDC min=0M max=10240M, usage=55%, bias=1.00 Xstore MDC min=0M max=2048M, usage=65%, bias=1.00 Total memory allocation to linux guests = 7GB. Thanks for your attention. ____________________________________________________________ Sent via the AlumMail https://alumni.nus.edu.sg ---------------------------------------------------------------------- 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
