On Fri, 27 Dec 2013 10:48:03 +0400 Vasiliy Tolstov <v.tols...@selfip.ru> wrote:
> 2013/4/22 NeilBrown <ne...@suse.de>: > > I'll try to make sure that works correctly for the next release. > > Thanks for the report. > > > Sorry, Neil. for bumping up old thread. I'm again have problems with > data-offset param for mdadm. > I'm using version from git master (guthub). If i try to create raid1 like > /sbin/mdadm --create --data-offset=2048 --metadata=1.2 --verbose > --force --run --bitmap=internal --assume-clean --name=md21_901 > md21_901 --level=raid1 --raid-devices=2 /dev/mapper/sas00-21_901 > /dev/mapper/sas01-21_901 > I have > Magic : a92b4efc > Version : 1.2 > Feature Map : 0x1 > Array UUID : 64e0028e:301aa3ce:cdf1a54f:a9e28f27 > Name : xen25:md21_901 (local to host xen25) > Creation Time : Fri Dec 27 10:43:06 2013 > Raid Level : raid1 > Raid Devices : 2 > > Avail Dev Size : 10489856 (5.00 GiB 5.37 GB) > Array Size : 5244928 (5.00 GiB 5.37 GB) > Data Offset : 4096 sectors > Super Offset : 8 sectors > Unused Space : before=4008 sectors, after=0 sectors > State : clean > Device UUID : 38771de6:cb5f0dbc:9f32f85f:164e1e89 > > Internal Bitmap : 8 sectors from superblock > Update Time : Fri Dec 27 10:43:22 2013 > Bad Block Log : 512 entries available at offset 72 sectors > Checksum : 7f07eb77 - correct > Events : 2 > > > But when i try to create raid1 like > /sbin/mdadm --create --data-offset=1024 --metadata=1.2 --verbose > --force --run --bitmap=internal --assume-clean --name=md21_901 > md21_901 --level=raid1 --raid-devices=2 /dev/mapper/sas00-21_901 > /dev/mapper/sas01-21_901 > I getting > Magic : a92b4efc > Version : 1.2 > Feature Map : 0x1 > Array UUID : ef22dca1:1424ea9e:1b4dce89:27c61a91 > Name : xen25:md21_901 (local to host xen25) > Creation Time : Fri Dec 27 10:44:21 2013 > Raid Level : raid1 > Raid Devices : 2 > > Avail Dev Size : 10491904 (5.00 GiB 5.37 GB) > Array Size : 5245952 (5.00 GiB 5.37 GB) > Data Offset : 2048 sectors > Super Offset : 8 sectors > Unused Space : before=1960 sectors, after=0 sectors > State : clean > Device UUID : afae5e27:6c706246:4c3e3cb0:e5c726ac > > Internal Bitmap : 8 sectors from superblock > Update Time : Fri Dec 27 10:44:26 2013 > Bad Block Log : 512 entries available at offset 72 sectors > Checksum : 45be4cd1 - correct > Events : 2 > > > Why data offset specified in command line grows twice in resulting md > array component? > The value given to --data-offset is assumed to be kilobytes unless it has a suffix: 'M' for megabytes, 's' for sectors. The value reported by 'mdadm -D' is (as it says) in sectors. 1024 kilobytes is 2048 sectors. If you want to specify sectors, add an 's' suffix. NeilBrown
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