Chris Hunter wrote:
>> Date:    Sun, 8 Mar 2009 12:38:54 +0900
>> From:    John Summerfield <[log in to unmask]>
>> Subject: Re: my ongoing battle with large filesystems
>>
>> Troy Dawson wrote:
>>> John Summerfield wrote:
>>> ...snip...
>>>> My research doesn't confirm that you _can_ do what you want using 
>>>> ext2 or ext3. I will have a better grasp if you answer the questions 
>>>> I asked.
>>>>
>>> This isn't really answering Miles questions, but I thought it was 
>>> good to know for the conversation, and sorta answers John's. question.
>>>
>>>  From RedHat's documentation on the limits of various things
>>> http://www.redhat.com/rhel/compare/
>>>
>>> For RHEL 5 (and hense SL 5)
>>>
>>> **i386**
>>> Max Filesize (ext3) - 2TB
>>> Max Filesystem Size (ext3) - 8TB
>>>
>>> **x86_64**
>>> Max Filesize (ext3) - 2TB
>>> Max Filesystem Size (ext3) - 16TB
>>>
>>> Troy

On reflection, I don't trust Troy's answer. It implies on-disk formats 
are different. He might be right, but I'd wish for confirmation.

>>
>> The limits depend on the block size.
> 
> Any ideas limits for NFS ? Does it depend on blocksize ? client 
> architecture (ie. 32/64 bit) ?

I have no information, just speculation.
The first limit would be determined by the server.
inodes point to blocks, and may contain additional pointers to more 
lists of blocks, but the number of blocks is a signed 32-bit int, giving 
a maximum number of 2^31-1 blocks.

The actual file size this represents depends on the block size used in 
the filesystem. Note too, that these block numbers apply both to a file 
and to the filesystem.

NFS can export a filesystem along with any other filesystems mounted 
within it. However, the limits above still apply.

Research:
http://www.google.com/search?q=define%3A+inode&start=0&start=0&ie=utf-8&oe=utf-8&client=mozilla&rls=org.mozilla:en-US:unofficial
http://en.wikipedia.org/wiki/Inode
http://en.wikipedia.org/wiki/Inode_pointer_structure
http://lwn.net/Articles/187321/
Note, the next site may be blocked by some corporate firewalls. I recall 
it coming up on one of our lists.
http://www.angelfire.com/myband/binusoman/Unix.html

Note that POSIX rules apply to Linux.


> 
> Thanks,
> --Chris
> 


-- 

Cheers
John

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