RAID5 fill up?

RAID5 fill up?

[Lars Schimmer]

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Hi!

I´ve got a software RAiD5 with 6 250GB HDs.
Now I changed one disk after another to a 400GB HD and resynced the
raid5 after each change.
Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
How can I grow the md0 device to use 6*400GB?

MfG,
Lars Schimmer
- --
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TU Graz, Institut für ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
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RAID5 fill up?

[Lars Schimmer]

Hi!

I´ve got a software RAiD5 with 6 250GB HDs.
Now I changed one disk after another to a 400GB HD and resynced the
raid5 after each change.
Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
How can I grow the md0 device to use 6*400GB?

MfG,
Lars Schimmer
-- 
-------------------------------------------------------------
TU Graz, Institut für ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
Fax: +43 316 873-5402       PGP-Key-ID: 0x4A9B1723
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Re: RAID5 fill up?

[Michael Tokarev]

Lars Schimmer wrote:
> Hi!
> 
> I´ve got a software RAiD5 with 6 250GB HDs.
> Now I changed one disk after another to a 400GB HD and resynced the
> raid5 after each change.
> Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
> How can I grow the md0 device to use 6*400GB?

mdadm --grow is your friend.

/mjt

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Re: RAID5 fill up?

[Lars Schimmer]

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Michael Tokarev wrote:
> Lars Schimmer wrote:
>> Hi!
>>
>> I´ve got a software RAiD5 with 6 250GB HDs.
>> Now I changed one disk after another to a 400GB HD and resynced the
>> raid5 after each change.
>> Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
>> How can I grow the md0 device to use 6*400GB?
> 
> mdadm --grow is your friend.

Oh, damn, right. I was focussed on --grow to add a new HD to the RAID....
But isn´t there a switch to grow to max possible value?
Do I always have to search for the biggest value and type it in by hand?

> /mjt
> 


MfG,
Lars Schimmer
- --
- -------------------------------------------------------------
TU Graz, Institut für ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
Fax: +43 316 873-5402       PGP-Key-ID: 0x4A9B1723
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Re: RAID5 fill up?

[Luca Berra]

On Fri, Sep 08, 2006 at 02:26:31PM +0200, Lars Schimmer wrote:
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>Hash: SHA1
>
>Michael Tokarev wrote:
>> Lars Schimmer wrote:
>>> Hi!
>>>
>>> I´ve got a software RAiD5 with 6 250GB HDs.
>>> Now I changed one disk after another to a 400GB HD and resynced the
>>> raid5 after each change.
>>> Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
>>> How can I grow the md0 device to use 6*400GB?
>> 
>> mdadm --grow is your friend.
>
>Oh, damn, right. I was focussed on --grow to add a new HD to the RAID....
>But isn´t there a switch to grow to max possible value?
>Do I always have to search for the biggest value and type it in by hand?
man mdadm
....
       -z, --size=
....
              This value can be set with --grow for RAID level 1/4/5/6. If the
              array  was created with a size smaller than the currently active
              drives, the extra space can be accessed using --grow.  The  size
              can  be given as max which means to choose the largest size that
              fits on all current drives.


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Re: RAID5 fill up?

[Lars Schimmer]

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Michael Tokarev wrote:
> Lars Schimmer wrote:
> []
>>>> mdadm --grow is your friend.
>> Oh, damn, right. I was focussed on --grow to add a new HD to the RAID....
>> But isn´t there a switch to grow to max possible value?
>> Do I always have to search for the biggest value and type it in by hand?
> 
> How about actually reading the fine manual? ;-P
> 
>   -z, --size=
> 
>               This value can be set with --grow for RAID level 1/4/5/6. If the
>               array  was created with a size smaller than the currently active
>               drives, the extra space can be accessed using --grow.  The  size
>               can  be given as max which means to choose the largest size that
>               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>               fits on all current drives.

*damn* This must be the friday... Or I´m in weekend to fast.

THANKS so far.

> /mjt


MfG,
Lars Schimmer
- --
- -------------------------------------------------------------
TU Graz, Institut für ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
Fax: +43 316 873-5402       PGP-Key-ID: 0x4A9B1723
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Re: RAID5 fill up?

[Mr. James W. Laferriere]

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 	Hello Neil & Luca ,

On Fri, 8 Sep 2006, Luca Berra wrote:
> On Fri, Sep 08, 2006 at 02:26:31PM +0200, Lars Schimmer wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>> 
>> Michael Tokarev wrote:
>>> Lars Schimmer wrote:
>>>> Hi!
>>>> 
>>>> I´ve got a software RAiD5 with 6 250GB HDs.
>>>> Now I changed one disk after another to a 400GB HD and resynced the
>>>> raid5 after each change.
>>>> Now the RAID5 has got 6 400GB HDs and still uses only 6*250GB space.
>>>> How can I grow the md0 device to use 6*400GB?
>>> 
>>> mdadm --grow is your friend.
>> 
>> Oh, damn, right. I was focussed on --grow to add a new HD to the RAID....
>> But isn´t there a switch to grow to max possible value?
>> Do I always have to search for the biggest value and type it in by hand?
> man mdadm
> ....
>      -z, --size=
> ....
>             This value can be set with --grow for RAID level 1/4/5/6. If the
>             array  was created with a size smaller than the currently active
>             drives, the extra space can be accessed using --grow.  The  size
>             can  be given as max which means to choose the largest size that
>             fits on all current drives.

 	Kuca ,  Thank you for posting this snippet .
 	Neil ,  Might changing ,

              can  be given as max which means to choose the largest size that
 	To
              can  be given as 'max' which means to choose the largest size that

 	help those reading this be aware that this is a 'string' to add to the
 	end of --size= ?  Also if there are other keywords not quoted ('') this
 	might be a good opertunity .  ;-)  Tia ,  JimL

-- 
+----------------------------------------------------------------------+
| James   W.   Laferriere |   System    Techniques   | Give me VMS     |
| Network        Engineer | 3600 14th Ave SE #20-103 |  Give me Linux  |
| babydr@baby-dragons.com |  Olympia ,  WA.   98501  |   only  on  AXP |
+----------------------------------------------------------------------+

Re: RAID5 fill up?

[Bill Davidsen]

Mr. James W. Laferriere wrote:

>    
>     Kuca ,  Thank you for posting this snippet .
>     Neil ,  Might changing ,
>
>              can  be given as max which means to choose the largest 
> size that
>     To
>              can  be given as 'max' which means to choose the largest 
> size that
>
>     help those reading this be aware that this is a 'string' to add to 
> the
>     end of --size= ?  Also if there are other keywords not quoted ('') 
> this
>     might be a good opertunity .  ;-)  Tia ,  JimL
>
Definitely a good idea! If I hadn't seen an example posted using that 
feature, I would have assumed that it just meant someone was too lazy to 
type 'maximum' at the time.

-- 
bill davidsen <davidsen@tmr.com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979