I used the "add the new PVs and delete the old (and let LVM migrate the extents)" method to move off dasd and it worked well. If you can't take the filesystems down the method has the advantage of no downtime, and LVM moves only the used PE's (physical extents) not the unused ones. Try it on a test server.
> -----Original Message----- > From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of > Richard Troth > Sent: Thursday, April 08, 2010 9:14 AM > To: LINUX-390@VM.MARIST.EDU > Subject: storage migration with mixed SAN and ECKD > > We're looking at a storage frame migration and considering which > methods to use. We have LUNs as PVs in LVM, with one or more LVs > defined for each volume group. What is best practice to move to new > sets of luns? > > Some methods which come to mind are ... > > rsync (of filesystem content) > dd (of LVs or of PVs) > LVM PV mirroring > LVM PV add/delete migration > tar (of filesystem content) > > If we can take the filesystems down, then 'rsync' would be preferred. > (It doesn't copy unused sections of the disk.) But it was suggested > that we might have less downtime if we use PV mirroring or even simply > add the new PVs and delete the old (and let LVM migrate the extents). > There's a huge unknown with both of the LVM tricks as far as the CPU > required (as Linux does the work automagically). > > Thoughts? > > Thanks. > > -- R; <>< This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
