On Tue, Nov 24 2015, Marco De Vitis wrote: > Hi, > I cannot understand a difference in size I can see on an old Debian 5.0 > machine, maybe I'm just missing something obvious. ... > > You can see that sdd6 is twice the size of sdd7. > cfdisk reports sizes of around 20 GB and 10 GB: > sdd6 -> 19329.41 > sdd7 -> 10010.17 > > All partitions in these two identical drives are configured as RAID 1 > using mdadm, but the md devices associated to sdd6/sdf6 and sdd7/sdf7 > are both reported to be 10 GB in size, as can be seen from the mdadm > output below. > > Why? Probably because the arrays aren't using the whole partition. e.g. if you have a RAID! comprised of 2 1GB partitions, then you fail one partition and had a 2GB partition as a spare and let it rebuild. Then fail the other 1GB partition and add a 3GB partition as a spare and let it rebuild. Then you will have a 1GB RAID made from 2 partitions, a 2GB partition and a 3GB partition. If you want to resize the RAID! to use all the available space, then use the command mdadm --grow /dev/md2 --size=max You might then need to resize and filesystem you have in that array. NeilBrown > > Thanks for any info. > >> #>mdadm -vv --detail /dev/md2 >> /dev/md2: >> Version : 00.90 >> Creation Time : Thu Feb 22 16:18:11 2007 >> Raid Level : raid1 >> Array Size : 9767424 (9.31 GiB 10.00 GB) >> Used Dev Size : 9767424 (9.31 GiB 10.00 GB) >> Raid Devices : 2 >> Total Devices : 2 >> Preferred Minor : 2 >> Persistence : Superblock is persistent >> >> Update Time : Mon Nov 23 14:19:23 2015 >> State : clean >> Active Devices : 2 >> Working Devices : 2 >> Failed Devices : 0 >> Spare Devices : 0 >> >> UUID : 5582dad7:7ac89883:0c2b9e1d:5009dd35 >> Events : 0.69228 >> >> Number Major Minor RaidDevice State >> 0 8 54 0 active sync /dev/sdd6 >> 1 8 86 1 active sync /dev/sdf6 >> >> #>mdadm -vv --detail /dev/md3 >> /dev/md3: >> Version : 00.90 >> Creation Time : Thu Feb 22 16:18:54 2007 >> Raid Level : raid1 >> Array Size : 9767424 (9.31 GiB 10.00 GB) >> Used Dev Size : 9767424 (9.31 GiB 10.00 GB) >> Raid Devices : 2 >> Total Devices : 2 >> Preferred Minor : 3 >> Persistence : Superblock is persistent >> >> Update Time : Mon Nov 23 14:19:27 2015 >> State : clean >> Active Devices : 2 >> Working Devices : 2 >> Failed Devices : 0 >> Spare Devices : 0 >> >> UUID : e44836cf:6340f7fa:52fb3562:a78d4dbb >> Events : 0.187630 >> >> Number Major Minor RaidDevice State >> 0 8 55 0 active sync /dev/sdd7 >> 1 8 87 1 active sync /dev/sdf7 > > -- > Ciao, > Marco. > > -- > 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
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