[OpenIndiana-discuss] 4k sectors again

[Jonathan Adams]

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.
>
> _______________________________________________
> OpenIndiana-discuss mailing list
> OpenIndiana-discuss at openindiana.org
> http://openindiana.org/mailman/listinfo/openindiana-discuss