Hi All, If any dtrace script is available to figure out the vdev_cache (or software track buffer) reads in kiloBytes ? The document says the default size of the read is 128k , However vdev_cache source code implementation says the default size is 64k Thanks Manoj Nayak
Manoj Nayak writes: > Hi All, > > If any dtrace script is available to figure out the vdev_cache (or > software track buffer) reads in kiloBytes ? > > The document says the default size of the read is 128k , However > vdev_cache source code implementation says the default size is 64k > > Thanks > Manoj Nayak > Which document ? It''s 64K when it applies. Nevada won''t use the vdev_cache for data block anymore. -r > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
> > Manoj Nayak writes: > > Hi All, > > > > If any dtrace script is available to figure out the vdev_cache (or > > software track buffer) reads in kiloBytes ? > > > > The document says the default size of the read is 128k , However > > vdev_cache source code implementation says the default size is 64k > > > > Thanks > > Manoj Nayak > > > > Which document ? It''s 64K when it applies. > Nevada won''t use the vdev_cache for data block anymore.How readahead or software track buffer is going to used in Navada without vdev_cache ? Any pointer to documents regarding that ? Thanks Manoj Nayak> > -r > > > > > > > _______________________________________________ > > zfs-discuss mailing list > > zfs-discuss at opensolaris.org > > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > >
On Jan 22, 2008, at 5:39 PM, manoj nayak wrote:>> >> Manoj Nayak writes: >>> Hi All, >>> >>> If any dtrace script is available to figure out the vdev_cache (or >>> software track buffer) reads in kiloBytes ? >>> >>> The document says the default size of the read is 128k , However >>> vdev_cache source code implementation says the default size is 64k >>> >>> Thanks >>> Manoj Nayak >>> >> >> Which document ? It''s 64K when it applies. >> Nevada won''t use the vdev_cache for data block anymore. > > How readahead or software track buffer is going to used in Navada > without > vdev_cache ? Any pointer to documents regarding that ?The vdev cache is still used - just for metadata. See: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/ common/fs/zfs/vdev_cache.c#35 http://blogs.sun.com/erickustarz/entry/vdev_cache_improvements_to_help eric