[OpenIndiana-discuss] 4k sectors again

[Roy Sigurd Karlsbakk]

Any idea where to find a 4TB drive with 512 byte sectors? Hitachis drives are 512b on 3TB, but AFAICS they have jumped to 4k sectors since the 4TB drives came out

roy

----- Opprinnelig melding -----
> Umm, no, not all drives do this, it is relatively easy to get hold of
> drives that aren't EARS ... you are just better off going for
> non-consumer drives.
> 
> Will post links if you need them.
> 
> Jon
> 
> On 15 February 2012 08:24, Roy Sigurd Karlsbakk <roy at karlsbakk.net>
> wrote:
> >> > 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/
> > --
> > I all pedagogikk er det essensielt at pensum presenteres
> > intelligibelt. Det er et elementært imperativ for alle pedagoger å
> > unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de
> > fleste tilfeller eksisterer adekvate og relevante synonymer på
> > norsk.
> >
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> 
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-- 
Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
--
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.