* examining the layout of an existing raid device?
@ 2011-09-26 10:18 Christoph Hellwig
2011-09-26 10:32 ` NeilBrown
0 siblings, 1 reply; 3+ messages in thread
From: Christoph Hellwig @ 2011-09-26 10:18 UTC (permalink / raw)
To: linux-raid
Maybe I'm just stupid, but is there a way to figure out the exact
geometry (e.g. pretty print of the superblock) for an existing array
somehow? I couldn't find anything in the mdadm man page for it.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: examining the layout of an existing raid device?
2011-09-26 10:18 examining the layout of an existing raid device? Christoph Hellwig
@ 2011-09-26 10:32 ` NeilBrown
2011-09-26 10:45 ` Christoph Hellwig
0 siblings, 1 reply; 3+ messages in thread
From: NeilBrown @ 2011-09-26 10:32 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-raid
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On Mon, 26 Sep 2011 06:18:24 -0400 Christoph Hellwig <hch@infradead.org>
wrote:
> Maybe I'm just stupid, but is there a way to figure out the exact
> geometry (e.g. pretty print of the superblock) for an existing array
> somehow? I couldn't find anything in the mdadm man page for it.
mdadm -E /dev/sda
will print the metadata on device /dev/sda which describes the array that it
is a member of.
mdadm -D /dev/md0
will print the geometry of the array /dev/md0
Is that what you wanted?
NeilBeown
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: examining the layout of an existing raid device?
2011-09-26 10:32 ` NeilBrown
@ 2011-09-26 10:45 ` Christoph Hellwig
0 siblings, 0 replies; 3+ messages in thread
From: Christoph Hellwig @ 2011-09-26 10:45 UTC (permalink / raw)
To: NeilBrown; +Cc: Christoph Hellwig, linux-raid
On Mon, Sep 26, 2011 at 08:32:48PM +1000, NeilBrown wrote:
> On Mon, 26 Sep 2011 06:18:24 -0400 Christoph Hellwig <hch@infradead.org>
> wrote:
>
> > Maybe I'm just stupid, but is there a way to figure out the exact
> > geometry (e.g. pretty print of the superblock) for an existing array
> > somehow? I couldn't find anything in the mdadm man page for it.
>
> mdadm -E /dev/sda
>
> will print the metadata on device /dev/sda which describes the array that it
> is a member of.
Ok, that includes the information I was looking for, including the
chunk size, and layout.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-09-26 10:18 examining the layout of an existing raid device? Christoph Hellwig
2011-09-26 10:32 ` NeilBrown
2011-09-26 10:45 ` Christoph Hellwig
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