basti <black.flederm...@arcor.de> writes: If I do this it works:
# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/loop0 /dev/loop1 Creates a two disk RAID1 array. Adding a third disk: # mdadm --grow /dev/md0 --level=1 --raid-devices=3 --add /dev/loop2 And: # mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Tue Apr 14 14:27:00 2015 Raid Level : raid1 Array Size : 1047552 (1023.17 MiB 1072.69 MB) Used Dev Size : 1047552 (1023.17 MiB 1072.69 MB) Raid Devices : 3 Total Devices : 3 Persistence : Superblock is persistent Update Time : Tue Apr 14 14:28:39 2015 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Name : gaheris:0 (local to host gaheris) UUID : f330ab72:fe728ef6:23d3ab0f:5a6c67ff Events : 40 Number Major Minor RaidDevice State 0 7 0 0 active sync /dev/loop0 1 7 1 1 active sync /dev/loop1 2 7 2 2 active sync /dev/loop2 Removing it: # mdadm /dev/md0 --fail /dev/loop2 --remove /dev/loop2 mdadm: set /dev/loop2 faulty in /dev/md0 mdadm: hot removed /dev/loop2 from /dev/md0 And set the array back to 2: # mdadm --grow /dev/md0 --raid-devices=2 raid_disks for /dev/md0 set to 2 > thanks but > > > # mdadm --add /dev/md1 --raid-devices=3 --spare-devices=0 /dev/sde1 > mdadm:option --raid-devices not valid in manage mode > > # mdadm --add /dev/md1 --spare-devices=0 /dev/sde1 > mdadm:option --spare-devices not valid in manage mode > > # mdadm --grow /dev/md1 --raid-devices=3 --spare-devices=0 > mdadm:option --spare-devices not valid in grow mode > > Am 14.04.2015 12:07, schrieb Darac Marjal: >> On Tue, Apr 14, 2015 at 11:42:22AM +0200, basti wrote: >>> Hello >>> I want to add a 3rd drive to a raid 1 array (for disaster backup, the >>> drive will be connectet once a week). >>> I dry: >>> >>> mdadm --add /dev/md1 /dev/sde1 >>> >>> when I fail the drive there is a message >>> >>> FailSpare event detected on md device /dev/md/1, component device /dev/sde1 >>> >>> How can I add the 3rd drive as "real drive" and not as spare? >> Looking at the mdadm manpage (i.e. I've not tried this myself), you >> could try being moew explicit about things: >> >> mdadm --add /dev/md1 --raid-devices=3 --spare-devices=0 /dev/sde1 >> >> (Note however that the manpage I'm reading - the one in Wheezy - seems a >> little unsure whether the option is --raid-devices or --raid-disks). >> >> I think, also, you can convert /dev/sde1 from "spare" to "live" by >> issuing: >> >> mdadm --grow /dev/md1 --raid-devices=3 --spare-devices=0 >> >> One last thing to be aware of. If you DO set up your three-disk RAID1 >> and then take the "backup" drive out of the set, be aware that that will >> mark the RAID as "degraded" and expect to get warnings to that effect. >> >> There doesn't appear to be a way to re-mark a device as spare so, to >> cleanly remove it, you will need to mark it as faulty (mdadm /dev/md1 -f >> /dev/sde1). I don't know, off-hand, if this will affect the backup, >> though. >> >>> Best Regards >>> >>> >>> -- >>> To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org >>> with a subject of "unsubscribe". Trouble? Contact >>> listmas...@lists.debian.org >>> Archive: https://lists.debian.org/552ce0fe.2030...@arcor.de >>> -- "We will need a longer wall when the revolution comes." --- AJS, quoting an uncertain source. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/86k2xeevph....@gaheris.avalon.lan