Add a 3rd drive to a existing raid1 (not as spare)
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? 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
Re: Add a 3rd drive to a existing raid1 (not as spare)
Hi. 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? You've started going into right direction, but there's one small step you need to take: mdadm --add /dev/md1 /dev/sde1 mdadm --grow --raid-devices=3 /dev/md1 Last command will convert spare drive to a 'real' one. Or, you can play rough: mdadm --grow --raid-devices=3 --force /dev/md1 mdadm --add /dev/md1 /dev/sde1 Reco -- 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/20150414122755.GA19826@x101h
Re: Add a 3rd drive to a existing raid1 (not as spare)
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 signature.asc Description: Digital signature
Re: Add a 3rd drive to a existing raid1 (not as spare)
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 -- 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/552cea8f.9020...@arcor.de
Re: Add a 3rd drive to a existing raid1 (not as spare)
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 0 700 active sync /dev/loop0 1 711 active sync /dev/loop1 2 722 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
