On 17 February 2013 21:12, Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote: > > > Am 17.02.2013 22:03, schrieb Heinz Diehl: >> On 17.02.2013, Reindl Harald wrote: >> >>> if wouldn't do this and stick with dd / disk images and use gparted >>> to resize partitions because if i clone machines i want to have >>> all UUID's the same >> >> You can easily change/tailor your UUIDs with tools like tune2fs > > have fun change also the RAID UUID's everywhere > and setup all identical because you have also > internal UUIDs on the RAID-partitions > > > [root@srv-rhsoft:~]$ cat /etc/mdadm.conf > MAILADDR root > AUTO +imsm +1.x -all > ARRAY /dev/md0 level=raid1 num-devices=4 UUID=1d691642:baed26df:1d197496:4fb00ff8 > ARRAY /dev/md1 level=raid10 num-devices=4 UUID=b7475879:c95d9a47:c5043c02:0c5ae720 > ARRAY /dev/md2 level=raid10 num-devices=4 UUID=ea253255:cb915401:f32794ad:ce0fe396 > > oh yeah and the tun2fs-output of /dev/md0 is > [root@srv-rhsoft:~]$ tune2fs -l /dev/md0 | grep UUID > Filesystem UUID: 1de836e4-e97c-43ee-b65c-400b0c29d3aa > > again: have fun to reacreate this setup 1:1 after rsync to > new drives - i bet it would not work at the end - well it > may not interest you on your setups, mine are always two > identical machines which are synced daily > >> The "dd" approach has a bunch of disadvantages, one of the biggest is >> misalignment if your new drive is a SSD or advanced format HDD > > which misalignment? > > if i switch to SSD some years later as soon as 4x2 TB are at a > normal price i will simply remove disk 1, insert a SSD, rebuild > RAID and after the rbuild the same for the other 3 drives > > I don't have a solid reference for this, only hearsay, but dd as a way to transfer filesystems or partitions to SSD probably interferes with wear-levelling. http://serverfault.com/questions/282555/zeroing-ssd-drives http://www.wonkity.com/~wblock/docs/html/ssd.html I guess RAID tools must now have some way to address this. -- imalone http://ibmalone.blogspot.co.uk -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
