On 12/06/2010 05:36 PM, Georges Giralt wrote: > Hello ! > I've a system (now on Ubuntu 9.04, but initially on a Fedora ) set up as > follow : > There are two RAID1 software raid arrays (md0 , which is around 100 Mb > and holding an Ext2 FS for use in booting, md1 occupying the rest of the > space used as a PV for LVM) made on a couple of old 160 GB disks. > > On the LVM VG0 are a lot of LV onto which Ubuntu is installed. > > One of the two disks failed. I can't find a 160 GB replacement. Only 320 > Gb for the smallest availlable disk near where I live. > > So I plan to move the system to 320 GB disks and, if possible, not > wasting the 320-160 difference.... > The process I thought about is as follow : > > 1) insert one 320 disk in both arrays (after partitioning it correctly, > 100 Mb for the first partition and the remaining for the second.) > > 2) wait for the raid1 to synchronize. > > 3) mark the remaining 160 GB disk as failed and remove/replace with > another 320 GB disk set up as the first. > > 4) wait for the arrays to reconstruct/synchronize. > > 5) Extend the PV my Volume Group is build on (md1 in this case) > > 6) enjoy a beer... > > What do you think of my method ? Is it a good one or am I missing > something ? You will have understood that losing data is not an option ... > Many thanks in advance for your answers, critics and pointers... > Regards. Your method will fail because the raid superblock is at the end of the partition. I use and recommend this variation: 1. Replace 160 with 320, allocate 2 partitions to match (or slightly exceed if geometry requires) the partitions on the 160. Synchronize. 2. Replace the 2nd 160, resynchronize. 3. Add a 3rd raid1 with the remaining space, and extend the VG with the additional PV. If your system can support 3 drives, you can always partition to mirror everything despite size mismatches. For example, step 3 would become: 3a. reinstall the 160 and allocate 2 80g partitions on the 160 (which is no longer the default boot drive). Allocate an 80g partition on each 320 to mirror the 2 80g partitions giving md2 and md3. Mirror the remaining 80g in each 320 for md4. Extend the VG with the addition 3 PVs. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
