[OpenIndiana-discuss] 4k sectors again

[Roy Sigurd Karlsbakk]

> > Seems most drives are moving to 512-bytes-on-4k-sectors these days,
> > as
> > with the new 7K4000 drives from Hitachi. I saw a patch for zpool
> > some time
> > back, fixing ashift, but that's all. Is there an official fix
> > somewhere?
> > What do people with 4k drives do?
> >
> 
> If the drive reports its block size as 4K ZFS will do the right thing
> already. Only drives that lie about the actual block size and report
> 512
> bytes are problematic.
> For such drives the technique I found useful is to create a pool on
> some
> other devices that are true 4K and then replace the devices one by one
> with
> the problematic drives.
> COMSTAR comes really handy for such a trick. Also Linux ZFS let you
> specify
> ashift manually during pool creation.

Basically, *all* drives lie about this these days, so we'd better fix it in software instead of hoping drives and politicians stop lying.

So I guess what must be done, then, is to port the fix from Linux ZFS to Illumos/OpenIndiana? Installing this system with linux zfs and then move to openindiana isn't very amusing...

Any idea how much code this is? Or is it the old patch that was rejected a year ago or so?

Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
--
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