On Thu, Mar 22, 2012 at 12:03 AM, NeilBrown <neilb@xxxxxxx> wrote: > On Wed, 21 Mar 2012 17:21:55 +0400 CoolCold <coolthecold@xxxxxxxxx> wrote: > >> Btw, was interested in, where bitmap will be placed when adding it on >> live array? I.e. as it requires some diskspace, we should provide some >> free space, but where it can be taken from if array is already created >> and used by, say filesystem? > > For 0.90 metadata there is 60K of unused space after the superblock. The > bitmap is stored there. > > For 1.x, the metadata stores a data_offset and data_size. All array data is > in that range. Anything out side there is available for mdadm to use. > When mdadm creates an array it reserves enough space for bitmap and possible > other uses. > > NeilBrown > John, Neil, thanks for sharing this info! May be add it this to wiki? >> >> On Tue, Mar 20, 2012 at 1:40 AM, Larkin Lowrey >> <llowrey@xxxxxxxxxxxxxxxxx> wrote: >> > On 3/19/2012 4:32 PM, NeilBrown wrote: >> >> On Mon, 19 Mar 2012 11:44:45 -0500 Larkin Lowrey >> > <llowrey@xxxxxxxxxxxxxxxxx> >> >> wrote: >> >> >> >>> The following command oopsed. >> >>> >> >>> mdadm -G --bitmap=internal /dev/md0 >> >>> >> >>> The array is a two disk raid1 and hosts the root filesystem. >> >>> >> >>> Is it not possible/allowed to add a bitmap to an active/mounted array? >> >> >> >> It is. But it is busted. >> >> >> >> Either use an older mdadm (3.2.2 or earlier), or apply this patch >> >> >> >> http://neil.brown.name/git?p=md;a=commitdiff;h=4474ca42e2577563a919fd3ed782e2ec55bf11a2 >> >> >> >> which has been sent to Linus already and should appear in -stable >> > kernels in >> >> a couple of weeks. >> >> >> >> NeilBrown >> > >> > Thank you for the explanation. >> > >> > --Larkin >> > >> > -- >> > 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 >> >> >> > -- Best regards, [COOLCOLD-RIPN] -- 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
