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authorBrian Behlendorf <[email protected]>2012-09-02 16:34:12 -0700
committerBrian Behlendorf <[email protected]>2012-11-15 11:06:14 -0800
commit2404b01499019f6a8589cec79201b8871ec48081 (patch)
tree0d5ee50e47a40021671213217743e1c5efbb162c /config/.gitignore
parent32a9872bbae90a7cd9793c371f558701ec268976 (diff)
Improve AF hard disk detection
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 <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #916
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