Tomasz Chmielewski wrote: > Peter Rabbitson schrieb: >> Tomasz Chmielewski wrote: >>> I have a RAID-10 setup of four 400 GB HDDs. As the data grows by several >>> GBs a day, I want to migrate it somehow to RAID-5 on separate disks in a >>> separate machine. >>> >>> Which would be easy, if I didn't have to do it online, without stopping >>> any services. >>> >>> >> >> Your /dev/md10 - what is directly on top of it? LVM? XFS? EXT3? > > Good point. I don't want to copy the whole RAID-10. > I want to copy only one LVM-2 volume (which is like 90% of that RAID-10, > anyway). > > > So I want to synchronize /dev/LVM2/my-volume (ext3) with /dev/sdr (now > empty; bigger than /dev/LVM2/my-volume). > > > (sda2, sdb2, sdc2, sdd2) -> RAID-10 -> LVM-2 -> my volume -> ext3 > > I've not used iSCSI but I wonder about using nbd : network block device Use nbd to export /dev/md5 from machine 2. Import /dev/nbd0 on machine 1. Add nbd0 to the VG on machine 1 pvmove the data from /dev/md10 to /dev/nbd0 (ie the md5 on machine2 via nbd) remove /dev/md10 from the VG. The VG should now exist only on /dev/nbd0 on machine 2 stop the services and lvm on machine 1 start the lvm and services on machine 2. I'd suggest testing this first <grin>. David - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
