Re: Extent Depth Histogram Fsck

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2012-06-26, at 8:34 AM, Nelson, John R wrote:
> What does the extent depth histogram mean? Is it a measure of something?
> 
> like mine is 
> 
> 
> Extent depth histogram: 36010/81

This means that of all the extent-mapped files in the filesystem,
36010 files have an extent tree of depth 0 (i.e. they fit inside the inode)
81 files have an extent tree of depth 1 (i.e. there is a single index block)

Typically, files larger than 4 * 128MB = 512MB need an index block, but if
the maximum-sized extents cannot be allocated then an index block will be needed for smaller files.  Only if you have very large files (> 40GB),
or a very fragmented free space would you need more than a single level
of index blocks.

Cheers, Andreas





--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux