Mike, The "compatibility" mode of zFS is soon to be the only mode of zFS. The multi-file mode aggregates are being phased out in all environments, not just in a SYSPLEX. The costs associated with maintaining multiple file systems in a single zFS container were found to outweigh the benefits in all environments, even more so in a SYSPLEX. However, even in single file mode (compatibility was a bad name choice in my opinion), you do get all the performance and other benefits of zFS over HFS. Note that HFS has been "functionally stabilized" so no new enhancements will be made to it, and zFS is the replacement, so migrating from HFS to zFS should a project in the pipeline.
Wayne Driscoll Product Developer JME Software LLC NOTE: All opinions are strictly my own. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hill Sent: Saturday, November 24, 2007 1:44 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: HFS Vs ZFs Could someone please explain what has been going on with zFS recommendations etc. I have also seen recommendations that we should all move from HFS to zFS file systems. Now, we are told that we should not use zFS Milti-File Mode (MFM) aggregates in shared systems. If I was running a non-shared environment, I would avoid migrating to zFS Multi-File Mode aggregates in case I may later move to a shared environment in the future. That seems a reasonable stand to take and would mean that zFS MFM Aggregates would be little used. If we are all therefore to use compatibility mode aggregates, do we still get the documented benefits of zFS? Namely, read only clones, performance benefits and increase integrity when using Compatibility Mode aggregates? The recommendation telling us not to use zFS MFM aggregates in a shared HFS environment were not there in the first announcements of zFS, so what happened to cause such a drastic U-turn? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
