zfs discuss - Mar 2010 - How to reserve space for a file on a zfs filesystem

Hi all,

How to reserve a space on a zfs filesystem? For mkfiel or dd will write
data to the
block, it is time consuming. whiel "mkfile -n" will not really hold
the
space.
And zfs''s set reservation only work on filesytem, not on file?

Could anyone provide a solution for this?

Thanks very much
Vincent

On Wed, Mar 17, 2010 at 6:43 AM, wensheng liu <vincent.liuws at
gmail.com>wrote:
> Hi all,
>
> How to reserve a space on a zfs filesystem? For mkfiel or dd will write
> data to the
> block, it is time consuming. whiel "mkfile -n" will not really
hold the
> space.
> And zfs''s set reservation only work on filesytem, not on file?
>
> Could anyone provide a solution for this?
>
Do you mean you want files created with "mkfile -n" to count against
the
total filesystem usage ?

Since they''ve not allocated any blocks yet, ZFS would need to know
about
each spare file and read it''s metadata before enforcing the filesystem
reservation. I''m not sure it''s doable.

-- 
Giovanni
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100317/3084a6ed/attachment.html>