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xfs_filesystem_structure
2020 Jul 17
2
hardlinks
Il 17/07/20 10:54, Karl Vogel ha scritto:
> It depends on the size of the variables in the structure used by the
> stat() call. In ext4, the "links" variable is an unsigned 16-bit integer,
> so you have your limit of 64k or so. I've worked with systems where
> the limit was a signed 16-bit integer, so it maxed out at 32k.
>
> XFS may be a full 32-bit integer, so
2015 Feb 16
4
Centos 7.0 and mismatched swap file
...time. When the workload IO
involves a lot of concurrency, XFS over linear will beat XFS or ext4
over raid0. Whereas for streaming performance workloads, striped raid
will work better. If redundancy is needed, mdadm permits creation of
1+linear, as compared to 10.
http://xfs.org/docs/xfsdocs-xml-dev/XFS_Filesystem_Structure/tmp/en-US/html/Allocation_Groups.html
You can think of XFS on linear as being something like raid0 at a file
level, rather than at a block level. On a completely empty file system
if you start copying a pile of dozens or more (typically hundreds or
thousands) of files in mail directories, XFS dis...
2015 Feb 16
0
Centos 7.0 and mismatched swap file
...O
> involves a lot of concurrency, XFS over linear will beat XFS or ext4
> over raid0. Whereas for streaming performance workloads, striped raid
> will work better. If redundancy is needed, mdadm permits creation of
> 1+linear, as compared to 10.
> http://xfs.org/docs/xfsdocs-xml-dev/XFS_Filesystem_Structure/tmp/en-US/html/Allocation_Groups.html
>
> You can think of XFS on linear as being something like raid0 at a file
> level, rather than at a block level. On a completely empty file system
> if you start copying a pile of dozens or more (typically hundreds or
> thousands) of files in m...
2020 Jul 17
0
hardlinks
...tion. I will try to rearch this limit (by
> curiosity)
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
Have a look at
https://mirrors.edge.kernel.org/pub/linux/utils/fs/xfs/docs/xfs_filesystem_structure.pdf
On page 105 the inode structure is given:
__uint16_t di_onlink;
...
__uint32_t di_nlink
Page 107 gives more detail:
di_onlink:
In v1 inodes, this specifies the number of links to the inode from
directories. When the number exceeds 65535,the inode is converted to v2
and the link count is...
2015 Feb 16
2
Centos 7.0 and mismatched swap file
On Mon, Feb 16, 2015 at 12:07 AM, Michael Schumacher
<michael.schumacher at pamas.de> wrote:
> Btw., are you sure you want to use XFS for a mail server? I made some
> tests about a year ago and found that EXT4 is by the factor 10 faster
> compared to XFS. The tests I performed were using the "maildir" style
> postfix installation that results in many thousands files in