On Thursday, 06/01/2006 at 03:45 EST, "McKown, John" <[EMAIL PROTECTED]> wrote: > Please be kind. I don't have a z/Linux system around. But I know that > you cannot share a filesystem between two z/Linux instances in > read/write mode and hope to keep a usable filesystem (in the general > case). I wonder why the dasd driver cannot (or does it?) implement an > "ioctl" or some interface which the mount command could use to do a > device reserve against the dasd device when mounted in read/write mode > (or make it optional). Does anybody "partition" a 3390 into multiple > filesystems, then use those filesystems on different z/Linux instances? > > Just curious. IIRC, SCSI has some function similar to zSeries > reserve/release. But I don't remember what it is called. Or maybe I'm > dreaming again.
No, you're not dreaming: it's called reserve/release. And, yes, the Linux ECKD device driver has ioctl(BIODASDRSRV) and iotcl(BIODASDRLSE). But understand that a reserve stops ALL other I/O to the device and has no effect on the caches maintained by the other hosts. Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- 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
