On Feb 15, 2012, at 8:24 AM, Gordon Ross wrote:
> A recent version of the "ashift" patch can be found here:
> http://yalms.org/cr/zfs-blksize/
This is a good start, but I'd like to see some different changes, let's discuss.
My list:
1. separate the changes for format and zpool into two different
changesets
2. change the keyword "blocksize" to "physical-blocksize" to help avoid
confusion
around the overloaded term, "blocksize"
3. need to include grub tests (see earlier discussion on grub fixes for
different asize)
4. need to explore implications of ashift > 11, is the practical limit
ashift=13?
5. should we hardware the slogs to minimum 4KB anyway?
6. should we set un->un_sys_blocksize to 4KB for ISSSD() drives in sd?
>
> There are also changes there for the format command to make it do
> megabyte aligned partitions. With both changes in place, one can
> ensure 4k-aligned access on an illumos partition.
Don't really need a patch, a simple mdb script to change the
un->un_phy_blocksize
(or similar) prior to pool creation works. To some degree, this is what BSD
offers with
the geom utilities. IMNSHO, it would be nice to have a better UI to changing sd
un
parameters than "vi /kernel/drv/sd.conf; reboot"
-- richard
>
> Gordon
>
> On Wed, Feb 15, 2012 at 8:22 AM, Alasdair Lumsden <[email protected]>
> wrote:
>> Hi Roy,
>>
>>> Any idea how much code this is? Or is it the old patch that was rejected a
>>> year ago or so?
>>
>> It is indeed that patch.
>>
>> Illumos wasn't prepared to integrate it, but potentially OI could, as a
>> workaround until Illumos provide whatever solution they had in mind.
>>
>> I'll try and get hold of the code.
>>
>> Regards,
>>
>> Alasdair
>>
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