From: NeilBrown <neilb@suse.de>
To: Vasiliy Tolstov <v.tolstov@selfip.ru>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mdadm raid1 regression
Date: Mon, 6 Jan 2014 09:11:24 +1100 [thread overview]
Message-ID: <20140106091124.32dc1057@notabene.brown> (raw)
In-Reply-To: <CACaajQtt1t-tdCrW6eCgx0_0WxTNR1buV6H2iEj_gWzrV3JZfA@mail.gmail.com>
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On Fri, 27 Dec 2013 10:48:03 +0400 Vasiliy Tolstov <v.tolstov@selfip.ru>
wrote:
> 2013/4/22 NeilBrown <neilb@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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next prev parent reply other threads:[~2014-01-05 22:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-18 10:38 mdadm raid1 regression Vasiliy Tolstov
2013-04-19 20:52 ` Greg KH
2013-04-21 22:35 ` NeilBrown
2013-04-22 6:28 ` Vasiliy Tolstov
2013-12-27 6:48 ` Vasiliy Tolstov
2014-01-05 22:11 ` NeilBrown [this message]
2014-01-22 11:56 ` Vasiliy Tolstov
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