Re: newfs limits? 10TB filesystem max?

From: Eric Anderson <anderson_at_centtech.com>
Date: Wed, 16 Feb 2005 17:00:41 -0600
Brooks Davis wrote:
> On Wed, Feb 16, 2005 at 03:58:19PM -0600, Eric Anderson wrote:
> 
>>Claus Guttesen wrote:
>>
>>>>I've just built an enormous 10TB filesystem.  When
>>>>trying to newfs the disk, it bombed with something
>>>>like "cannot allocate memory" after something like
>>>>23xxxxxxxxx sectors..  I noticed disklabel complains
>>>>about disks with more than 2^32-1 sectors not being
>>>>supported..  
>>>
>>>
>>>Aren't you supposed to use gpt(8) to define partitions
>>>larger than 2 TB?
>>
>>No idea - this is the first I've heard of gpt really..
>>
>>
>>
>>>>Is newfs supposed to be able to work?  I've used the
>>>>-s option to newfs to limit my filesystem size to
>>>>the max it would allow, which ends up being
>>>>11350482546 1K blocks, which means I'm only losing a
>>>>couple GB, which is no sweat right now for me, but
>>>>if someone wanted a 20TB filesystem, they'd be
>>>>hosed.
>>>
>>>
>>>Then the question is whether newfs reads
>>>gpt-partitioned disks? From newfs(8):
>>>
>>>Before running newfs the disk must be labeled using
>>>bsdlabel(8). 
>>>
>>>How did you create such a huge partition? Your
>>>question is quite interesting, I'm at a
>>>storage-solution which supports LUN's larger than 2.2
>>>TB.
>>
>>I used vinum to stripe 6 2TB partitions connected to 2 fiber channel disk 
>>arrays.  Vinum automatically does the bsdlabel part.  I was merely wanting 
>>to see what bsdlabel had to say about the vinum disk (if anything).
>>
>>Using newfs on it worked as long as I specified a smaller sector count.
> 
> 
> bsdlabels are for the most part unable to access more then 2TB of
> storage.  You should either newfs the disk directly or use gpt.  If
> vinum is creating a bsdlabel, the label is almost certaintly bogus if
> the disk is larger than 2TB.  There is an exception if the disk has
> sectors larger than 512K, but those are fairly rare.

Hmm - well, it works.. :)  Is there something I should be aware of that I'm not seeing?

If anyone is interested in any stats, or other info, please let me know.  I can provide any details if anyone is curious..

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
I have seen the future and it is just like the present, only longer.
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Received on Wed Feb 16 2005 - 22:02:59 UTC

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