External bitmap disappears

I've configured a raid10,f2 with an external bitmap:

mdadm --grow --bitmap=/md0.bitmap /dev/md0

The root ('/') filesystem is NOT on the raid. It's a normal partition
(/dev/sdb1, the boot device actually).
After reboot, cat /proc/mdstat does not show a bitmap. What's up with
that? That sure doesn't seem right.

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Jon
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Re: External bitmap disappears

Jon Nelson wrote:
> I've configured a raid10,f2 with an external bitmap:
>
> mdadm --grow --bitmap=/md0.bitmap /dev/md0
>
> The root ('/') filesystem is NOT on the raid. It's a normal partition
> (/dev/sdb1, the boot device actually).
> After reboot, cat /proc/mdstat does not show a bitmap. What's up with
> that? That sure doesn't seem right.

If a bitmap isn't stored inside a superblock, you have to
specify the same filename when ASSEMBLING the array.

Add it to mdadm.conf file.

/mjt

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Re: External bitmap disappears

I'd like to offer a suggestion, then:

perhaps mdadm --detail --scan
could add bitmap= to it's output as appropriate?


On Fri, Jun 20, 2008 at 8:45 AM, Michael Tokarev wrote:
> Jon Nelson wrote:
>> I've configured a raid10,f2 with an external bitmap:
>>
>> mdadm --grow --bitmap=/md0.bitmap /dev/md0
>>
>> The root ('/') filesystem is NOT on the raid. It's a normal partition
>> (/dev/sdb1, the boot device actually).
>> After reboot, cat /proc/mdstat does not show a bitmap. What's up with
>> that? That sure doesn't seem right.
>
> If a bitmap isn't stored inside a superblock, you have to
> specify the same filename when ASSEMBLING the array.
>
> Add it to mdadm.conf file.
>
> /mjt
>
>



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Re: External bitmap disappears

On Fri, June 20, 2008 11:48 pm, Jon Nelson wrote:
> I'd like to offer a suggestion, then:
>
> perhaps mdadm --detail --scan
> could add bitmap= to it's output as appropriate?

That's an excellent suggestion.

(makes note in ever-growing TODO list)

Thanks.

NeilBrown


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