Am 19.02.2013 18:19, schrieb Ian Malone: > 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 that is why i said "if 2 TB SSD's are at a normal price" which will not happen now AND not until i trust them which is not the case now and at least a disk have to survive running full without damage/impact for call it trustable the SD-card of my HTC hero destroyed the whole phone with overheat and the root cause was that it no longer did write any data but confirmed "all OK", i tried to put the SD-card on my PC, formatted it with different filesystems, did overwrite it with zero as also with random crap and each time after i took it out of the reader and inserted it again the last written data days ago where untouched NOTICE: and not a single warning in "dmesg" or /var/log/messages the whole time while any spinning disk would lead to warnings or errors in such cases - you understand while i do not trust them currently
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