Oh, it's not so bad. It's only about 22 mod 54 per Terabyte. Once it is out there and done (scripts are your friend) there's little management to it. We have one server with > than 110 mod 54.
What are you going to put on it Kyle? That may indicate whether the performance will work for you w/o PAV. Marcy -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Mark Post Sent: Friday, April 15, 2011 5:31 PM To: [email protected] Subject: Re: [LINUX-390] Largest DASD Volume to Use with RHEL 5.3 under z/VM 6.1 >>> On 4/15/2011 at 08:21 PM, Kyle Stewart <[email protected]> >>> wrote: > We are implementing another RHEL 5.3 under z/VM 6.1. The folks we are doing > this for would like 1-2TB of data. Can RHEL 5.3 use mod 54s? Yes. Linux doesn't care about model numbers. > What are the > down sides? Without the use of PAV, performance. z/VM can only start one I/O to a subchannel at a time. The more data you have on one subchannel, the more you might wait to get at it. > Would I be better off with mod 27s and if so, why? Thanks in > advance. I would say that for that amount of data, you would be better off using SCSI over FCP. Trying to build up very large file systems with DASD (and LVM) is a pain to manage. Mark Post ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
