At the moment I have only XFS in production (it is CentOS default) so I cannot give you current information related to ext filesystems. $ sudo xfs_db -r -c frag /dev/sda1 actual 335, ideal 331, fragmentation factor 1.19% Regards Peter On Tue, Aug 25, 2015 at 10:21 AM, Trent W. Buck <trentbuck@gmail.com> wrote:
Peter Ross <petrosssit@gmail.com> writes:
BTW: I am reducing it to 2% since.. long long time. I haven't seen an issue arising from this at all.
Hm, for the purposes of avoiding fragmentation, I suppose the reserve amount needs to be proportional to <bytes written per interval> rather than the disk size.
I assume the disk size has grown faster that write speed, and the 5% default was conservative even when it was introduced.
So your result makes intuitive sense to me.
OOC, Peter, what fragmentation does e2fsck -f report for your filesystems? With repeated filling as root or with 0% reserve, I've seen it go up to 20% or 30% (IIRC).
NB: you can edit mke2fs to make new (ext) fs's default to 2%.
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