On Fri, 8 Jul 2005 14:40:25 -0500, Mark Zelden <[EMAIL PROTECTED]> wrote:
>On Fri, 8 Jul 2005 15:19:53 -0400, Gabriel Tully <[EMAIL PROTECTED]> wrote: > >>On 7/8/05, Mark Zelden <[EMAIL PROTECTED]> wrote: >> >>...snip... >> >>> Also, if /tmp a TFS and is large I think it could impact OMVS since it >>> takes storage from the kernel. >> >> Is this really true. I'm kind of surprised. So, any malicious or >>more likely sloppy user/programmer/sysadmin can fill up the tmp >>directory and hose OMVS? >> > >That's not what I meant. Filling it up doesn't hurt anything (but >the process(es) trying to write to the TFS). From what I remember >(and I haven't looked into this for a long time) TFS storage is >"carved out" from the kernel. All that means is less storage >available to the kernel, which depending on your environment >and size of all your TFS file systems could be an impact. > >Since you cross posted to OMVS list, you'll probably get much >better information there. If I'm totally off my rocker, please >let me know. I'm subscribed to that list, but I am set to no-mail >and don't normally follow it. > >Regards, > >Mark Of course looking at the fine manual never hurts. Search for TFS in the z/OS Unix Planning manual. I found more information under "colony addresses space" about this than in the section under TFS (which did point to the colony section). Some quotes: "A temporary file system (TFS) is an in-memory physical file system that supports in-storage mountable file systems. Normally, a TFS runs in the kernel address space, but it can be run in a logical file system (LFS) colony address space." "A TFS uses private storage for the file system in memory. If you run it in the kernel, then you might run out of virtual storage." I run 2 6M TFSes for /dev and /var and I've run a 20M TFS for /tmp at another shop that didn't really do anything with OMVS. So small TFSes certainly aren't a cause for alarm. But what about a 200M TFS for /tmp? Don't know, never tried it. I would need one much bigger than that for some of our LPARs. So who is running a "big" (FSVO big) TFS in an active OMVS envionment? Mark -- Mark Zelden Sr. Software and Systems Architect mailto: [EMAIL PROTECTED] Systems Programming expert at http://Search390.com/ateExperts/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- 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
