mdadm what does it mean

mdadm what does it mean

[Kenneth Aar]

Hi

I am using mdadm to manage my RAID arrays, but cant seem to find an easy
to understand or concise explanation of what the different parameters
mean when I write:
cat /proc/mdstat in the terminal.

The ones I can't even guess are:

super
bitmap
pages
chunk

Could someone please point me to such a place that will tell me this, or
if you are blessed with fortuitous amounts of time explain it to me in
an email.

My output when I write cat /proc/mdstat today is:
--------

Personalities : [raid1]
md0 : active raid1 sda1[0] sdc1[1]
      488383864 blocks super 1.0 [2/2] [UU]
      bitmap: 2/466 pages [8KB], 512KB chunk

md3 : active raid1 hdb4[0] sdb4[1]
      183711232 blocks [2/2] [UU]

md1 : active raid1 hdb2[0] sdb2[1]
      104320 blocks [2/2] [UU]

md2 : active raid1 sdb3[0] hdb3[1]
      10490372 blocks super 1.0 [2/2] [UU]
      bitmap: 0/161 pages [0KB], 32KB chunk

unused devices: <none>
--------
Any help or pointers appreciated. I tried reading through the man pages
but I am not any wiser. Or it could be that I just missed the relevant
sections.

-- 
Mvh
Kenneth Aar
Grafikern
@:       kenneth@grafikern.no
Nett:    http://www.grafikern.no
Fasttelefon(IP-telefon):  62 11 17 01
Mobil: 92 89 99 89 Faks: 92 57 57 25

Re: mdadm what does it mean

[David Greaves]

Kenneth Aar wrote:
> Hi
> 
> I am using mdadm to manage my RAID arrays, but cant seem to find an easy
> to understand or concise explanation of what the different parameters
> mean when I write:
> cat /proc/mdstat in the terminal.

http://linux-raid.osdl.org/index.php/Mdstat

Let us know if there is anything unclear after reading it.

Hmm. Neil, maybe it would be appropriate to have the wiki in a 'See also'
section of the manpage?

David

Re: mdadm what does it mean

[Kenneth Aar]

Kenneth Aar skrev:
> David Greaves skrev:
>> Kenneth Aar wrote:
>>   
>>> Hi
>>>
>>> I am using mdadm to manage my RAID arrays, but cant seem to find an easy
>>> to understand or concise explanation of what the different parameters
>>> mean when I write:
>>> cat /proc/mdstat in the terminal.
>>>     
>>
>> http://linux-raid.osdl.org/index.php/Mdstat
>>
>> Let us know if there is anything unclear after reading it.
>>
>> Hmm. Neil, maybe it would be appropriate to have the wiki in a 'See also'
>> section of the manpage?
>>
>> David
> Thank you that did the trick
>
>
> -- 
>
> Mvh
> Kenneth Aar
> Grafikern
> @:       kenneth@grafikern.no
> Nett:    http://www.grafikern.no
> Fasttelefon(IP-telefon):  62 11 17 01
> Mobil: 92 89 99 89 Faks: 92 57 57 25