Resizing PVs (was: Installation Impressions)
Sam Sharpe lists.red...@samsharpe.net writes: On 5 February 2011 20:53, Nikolaus Rath nikol...@rath.org wrote: JFTR, unfortunately PVs cannot be made smaller. The whole idea of LVM is to do all the resize operations *within* the containers. JFTR, unfortunately, you'll need to raise a bug against the pvresize manpage then... http://linux.die.net/man/8/pvresize --- Shrink the PV on /dev/sda1 prior to shrinking the partition with fdisk (ensure that the PV size is appropriate for your intended new partition size): pvresize --setphysicalvolumesize 40G /dev/sda1 --- When filing the report, please state why your assertion for the record is correct over the maintainer's. You can shrink a PV, but you will loose the extents that are stored in the space that you have truncated. I don't consider that resizing. From the same manpage that you looked up: , | pvresize will refuse to shrink PhysicalVolume if it has allocated | extents after where its new end would be. In the future, it should | relocate these elsewhere in the volume group if there is sufficient free | space, like pvmove does. ` Unfortunately, pvmove can only move extends to other PVs but not to a different location in the same PV. Why so aggressive? -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Resizing PVs (was: Installation Impressions)
On 5 February 2011 22:15, Nikolaus Rath nikol...@rath.org wrote: You can shrink a PV, but you will loose the extents that are stored in the space that you have truncated. I don't consider that resizing. That's interesting. I do consider it resizing... It's not the function of the pvresize command to move the LVs around so that it is possible to downsize the PV. That's something that the admin must do. If I use fdisk to resize a partition, is it fdisk's job to resize the filesystem? From the same manpage that you looked up: , | pvresize will refuse to shrink PhysicalVolume if it has allocated | extents after where its new end would be. In the future, it should | relocate these elsewhere in the volume group if there is sufficient free | space, like pvmove does. ` Yup, that is true - so you need to free up those extents first. Often this is done by adding a second temporary PV to the VG. Unfortunately, pvmove can only move extends to other PVs but not to a different location in the same PV. Yes, so it won't do exactly what you want in one command, so you have to do it a different way. I have in the past added a second PV, Extended the VG to this PV, then moved enough LVs to that second PV to make reducing the original PV feasible. But the fact remains, that you can shrink a Physical Volume. Why so aggressive? I wasn't being particularly aggressive, but I do actually dislike people saying (or abbreviating) just for the record when they are incorrect or the facts are disputed. The only thing that goes in the official record are the facts. -- Sam -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Resizing PVs (was: Installation Impressions)
Once upon a time, Nikolaus Rath nikol...@rath.org said: You can shrink a PV, but you will loose the extents that are stored in the space that you have truncated. I don't consider that resizing. Changing the size of something is called resizing. Unfortunately, pvmove can only move extends to other PVs but not to a different location in the same PV. Not true. It isn't as straightforward; you have to know a map of the PEs and specify them to the pvmove command like (assuming the destination PEs are not in use): pvmove /dev/sda2:1000-1100 /dev/sda2:100-200 IIRC you get a warning, and it is slow (obviously, reading and writing a bunch of data on the same drive is slow). -- Chris Adams cmad...@hiwaay.net Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Re: Resizing PVs (was: Installation Impressions)
http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition Does that link have the information for handling the physical resizing? I had used the LVM option in the past, but have gone to making regular partitions on install, but do have some machines with old LVM setups. +--+ Michael D. Setzer II - Computer Science Instructor Guam Community College Computer Center mailto:mi...@kuentos.guam.net mailto:msetze...@gmail.com http://www.guam.net/home/mikes Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +--+ http://setiathome.berkeley.edu (Original) Number of Seti Units Returned: 19,471 Processing time: 32 years, 290 days, 12 hours, 58 minutes (Total Hours: 287,489) BOINC@HOME CREDITS SETI10331255.834230 | EINSTEIN 5371421.810851 ROSETTA 2765286.340461 | ABC 4335306.527607 -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
