We don't have mod54's yet--this is just a mod9, and we'll have static PAV aliases defined for the mod54s--but I assume the same logic applies. Does this mean that I can't use LVM for the four mountpoints (/usr, /var, /opt and /home) at all until we have PAV set up? I could define minidisks on different volumes, but at the moment we're storage-crunched--I've only got 3 mod9s to work with. If I stick with the current plan (/ on a separate disk, the other 4 on LVM), I'd have at least two filesystems overlapping--3 volumes but 5 mountpoints. I don't have a problem with the I/O requests waiting in that case, but it appears that the SLES9 install is trying to mount the LVM filesystems at once, since otherwise I would have thought I'd just have a "slow install", not get the "file descriptor 3 left open" error. Everything worked fine when I was installing all of root on a single minidisk...
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Hayden Sent: Friday, March 14, 2008 9:01 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: Is it possible to do an initial SLES9 install on a partially-LVM root? You need to remember that you can't start more than 1 I/O to an address (real or virtual!) at a time. This is a hardware restriction. This is why PAV was invented - so that the PAV alias addresses can be used to start parallel I/Os to the same base volume. So - if you don't have PAV, then it will not help to split up your mod 54 into minidisks. Linux may try to start more than 1 I/O at a time (since it can start one to each virtual address) but z/VM will only execute them one at a time and the other I/O requests will wait. If you had HyperPAV, then splitting up the mod 54 into minidisks works, because then z/VM will use the PAV pool for that device to do I/Os to that device in parallel. If you have static PAV, the same thing also works, but the alias addresses have to be set up in advance. If you had SLES 10, then instead, I'd recommend that you define virtual PAV aliases to the guest with 1 minidisk and use multipath on Linux for overlapped I/O. But - this is not supported on SLES 9. LEGAL DISCLAIMER The information transmitted is intended solely for the individual or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this email in error please contact the sender and delete the material from any computer. SunTrust and Seeing beyond money are federally registered service marks of SunTrust Banks, Inc. [ST:XCL] ---------------------------------------------------------------------- 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
