Re: recovery starts from 0 after reboot - normal?

[Tomasz Chmielewski <mangoo@wpkg.org>]

Tomasz Chmielewski schrieb:

(...)

> Perhaps, the bitmap is needed then? I guess by default, no internal 
> bitmap is added?
> 
> # mdadm -X /dev/md0
>         Filename : /dev/md0
>            Magic : 00000000
> mdadm: invalid bitmap magic 0x0, the bitmap file appears to be corrupted
>          Version : 0
> mdadm: unknown bitmap version 0, either the bitmap file is corrupted or 
> you need to upgrade your tools
> 
> 
> The fine manual says:
> 
>   BITMAP CHANGES
>   A write-intent bitmap can be added to, or removed from, an active
>   array. Either internal bitmaps, or bitmaps stored in a separate file
>   can be added.
> 
> 
> However, I'm not sure how to achieve it? How to add an internal bitmap 
> to an array without a bitmap?

According to the fine manual, BITMAP CHANGES belong to the grow mode.
So, let's try to do what the manual says - try to add a bitmap to the 
active array:


# mdadm --grow /dev/md0 --bitmap=internal
mdadm: failed to set internal bitmap.

# dmesg
md: couldn't update array info. -16


So, either I don't understand the manual, or there are more caveats in it.


-- 
Tomasz Chmielewski
http://wpkg.org