<para>The number of inodes on the MDT is determined at format time
based on the total size of the file system to be created. The default
<emphasis role="italic">bytes-per-inode</emphasis> ratio ("inode ratio")
- for an ldiskfs MDT is optimized at one inode for every 2048 bytes of file
+ for an ldiskfs MDT is optimized at one inode for every 2560 bytes of file
system space.</para>
<para>This setting takes into account the space needed for additional
ldiskfs filesystem-wide metadata, such as the journal (up to 4 GB),
the bytes-per-inode ratio to have enough space on the MDT for small files,
as described below.
</para>
- <para>It is possible to change the recommended 2048 bytes
+ <para>It is possible to change the recommended default of 2560 bytes
per inode for an ldiskfs MDT when it is first formatted by adding the
<literal>--mkfsoptions="-i bytes-per-inode"</literal> option to
<literal>mkfs.lustre</literal>. Decreasing the inode ratio tunable
MDT size, but will leave less space for extra per-file metadata and is
not recommended. The inode ratio must always be strictly larger than
the MDT inode size, which is 1024 bytes by default. It is recommended
- to use an inode ratio at least 1024 bytes larger than the inode size to
+ to use an inode ratio at least 1536 bytes larger than the inode size to
ensure the MDT does not run out of space. Increasing the inode ratio
- to include enough space for the most common file data (e.g. 5120 or 65560
+ with enough space for the most commonly file size (e.g. 5632 or 66560
bytes if 4KB or 64KB files are widely used) is recommended for DoM.</para>
<para>The size of the inode may be changed at format time by adding the
<literal>--stripe-count-hint=N</literal> to have