Holger Parplies schrieb:
> Hi,
>
> Carl Wilhelm Soderstrom wrote on 2011-05-26 06:05:48 -0500 [Re:
> [BackupPC-users] Best FS for BackupPC]:
> > On 05/26 12:20 , Adam Goryachev wrote:
> > > BTW, specifically related to backuppc, many years ago, reiserfsck was
> > > perfect as it doesn't have any concept or limit on 'inodes'... Same for
> > > mail and news (nntp) servers. Do XFS/JFS have this feature? I'll look
> > > into these things another day, when I have some time :)
> >
> > There are indeed 'inodes' listed in the 'df -i' output of XFS filesystems.
> > However, I've never heard of anyone hitting the inode limit on XFS, unlike
> > ext3.
>
> of course XFS *has* inodes, and I wondered about the 'df -i' output, too, when
> I tried it yesterday. I don't remember reiserfs giving any meaningful
> information for 'df -i' ... nope, '0 0 0 -'. I sincerely hope that XFS doesn't
> have *static inode allocation*, meaning I have to choose the number of inodes
> at file system creation time and waste any space I reserve for them but do not
> turn out to need. That was one main concern when choosing my pool FS.
> Actually, mkfs.xfs(8) explains a parameter '-i maxpct=<value>':
>
> This specifies the maximum percentage of space in
> the filesystem that can be allocated to inodes. The
> default value is 25% for filesystems under 1TB, 5%
> for filesystems under 50TB and 1% for filesystems
> over 50TB.
>
> The further explanation says this is achieved by the data block allocator
> avoiding lower blocks, which are needed for obtaining 32-bit inode numbers.
> It leaves two questions unanswered (to me, at least):
> ...
have a look at the inode64 mount option.
http://xfs.org/index.php/XFS_FAQ#Q:_What_is_the_inode64_mount_option_for.3F
Ralf
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