On Wed, Mar 28, 2012 at 10:50 AM, Florian Bilek <florian.bi...@gmail.com> wrote: > Is there a tool that would allow to increase the partition size of a DASD > partition?
Assuming CDL, the following sequence should work. (Is untested, but similar to steps I have run previously.) from the CMS side ... create new disk of larger size (at its own vaddr) CMS FORMAT the new disk for proper 4K blocks DDR old to new (first part will be old contents, second part will be empty blocks) remove old disk set vaddr of new disk to match old from the Linux side ... use 'fdasd' to fix-up the partition table use 'resize2fs' to enlarge the filesystem DONE. Rationale and other notes follow. "cut here" What Christian said is correct. I presume you DO NOT have the free space he mentions. The steps listed above give the effect of extending the underlying volume so that you have that free space and can follow his suggestion. Dave's recipe is very robust: create a new disk, copy the contents, delete the old, done! 'rsync' with the right options is very very good about handling sym-links and device files. If you used LVM, extending filesystems would be easier. (add another disk as a PV, extend the LV, resize the FS, no copying per se) Simply extending a minidisk imposes two problems. First, it is unlikely the cylinders following the minidisk are unused. Second, you would need to block just those cylinders. (And then hope that 'fdasd' resets the VTOC correctly.) Not having used 'fdasd' in several months, I DO NOT KNOW when it will and will not destroy the contents of your partition. Ideally, running 'fdasd -a -k' against the new disk will enlarge the partition to use the new space. "-k" tells it to preserve the label. We want it to also preserve the contents. (You would then 'e2fsck -f' and 'resize2fs'.) Perhaps one of the Boeblingen team members can weigh in on this point. CKD (either CDL or LDL) requires that the disk be blocked. In PC parlance that's "low level formatting". You can use 'dasdfmt' on Linux or use CMS FORMAT. CDL imposes a z/OS compatible first track. I avoid 'dd' for CDL volumes because the driver restricts what can be written to that track. (Thus my recommendation of instead doing DDR from CMS.) This first track is NOT blocked uniformly like the rest of the disk. CMS FORMAT of CKD always performs both low level (blocking) and high level (a CMS EDF filesystem). For CKD vols used by Linux, the CMS EDF filesystem is later discarded, *unless* you choose to CMS RESERVE the disk. The reserved file has its own merits which are beyond scope. But if you're on VM, "reserved" is the best justification for doing partitions at all. I encourage people to use FBA where possible because there no "low level" format is needed (no blocking required, already done). When using CKD, I encourage people to use "LDL" instead of "CDL" because all the tracks are blocked the same. -- R; Rick Troth Velocity Software http://www.velocitysoftware.com/ ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
