[Dovecot] minimize mbox mdbox fragmentation

[Jonathan Siegle]

On Oct 20, 2010, at 10:14 PM, Timo Sirainen wrote:

> On 21.10.2010, at 3.12, Denny Lin wrote:
> 
>> On Wed, Oct 20, 2010 at 06:45:17PM +0100, Timo Sirainen wrote:
>>> On Wed, 2010-10-20 at 13:32 -0400, Charles Marcus wrote:
>>>> On 2010-10-20 12:53 PM, Timo Sirainen wrote:
>>>>> Oh, interesting. I didn't know that was possible. And even better: Linux
>>>>> has fallocate() that can do it for other filesystems than just XFS. Or
>>>>> looks like it's only XFS and ext4 (ext3 doesn't support it).
>>>> 
>>>> How about reiserfs (3, not 4)?
>>> 
>>> Doesn't support.
>> 
>> Is it possible with UFS and ZFS?
> 
> Linux doesn't support either and my googling didn't find any FreeBSD or Solaris interface for this feature, so I don't know.
> 
AIX supports posix_fallocate but only for JFS2. For GPFS(what we use), the function is gpfs_prealloc.
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