2404b01499
Use the bdev_physical_block_size() interface to determine the minimize write size which can be issued without incurring a read-modify-write operation. This is used to set the ashift correctly to prevent a performance penalty when using AF hard disks. Unfortunately, this interface isn't entirely reliable because it's not uncommon for disks to misreport this value. For this reason you may still need to manually set your ashift with: zpool create -o ashift=12 ... The solution to this in the upstream Illumos source was to add a white list of known offending drives. Maintaining such a list will be a burden, but it still may be worth doing if we can detect a large number of these drives. This should be considered as future work. Reported-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #916 |
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| Makefile.am | ||
| blkdev_compat.h | ||
| dcache_compat.h | ||
| vfs_compat.h | ||
| xattr_compat.h | ||