[zfs-discuss] Re: Does ZFS do readahead?
rudd-o at rudd-o.com
Mon Feb 6 09:02:21 EST 2012
My question is because things have changed. Checking the linux source tree
documentation, now the readahead is a parameter that is supposed to be used by
the filesystem, rather than a block device readahead parameter as if it was in
Also, in queue/scheduler noop seems to be good, but what about the
queue/nr_requests parameter? As I understand, the lower nr_requests is, the
fewer requests that the block layer will queue and attempt to
reorganize/merge, the better ZFS itself can manage the I/O usage of the disk.
Am I correct?
On Friday, February 03, 2012 14:09:16 Stephane Chazelas wrote:
> 2012-02-03 04:56:20 -0800, Manuel Amador (Rudd-O):
> > Does it?
> > If it does,
> > Should I turn the disk readahead off? How do I go about doing that?
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