Support for sectorsizes > 4KB ?

Support for sectorsizes > 4KB ?

[Ralf Oehler]

Hi, List

In the not-so-far future there will occure MO media on the market with
40 to 120 Gigabytes of capacity and sectorsizes of 8 KB and maybe more.
It's called "UDO" technology.

Is there any way to support block devices with sectors larger than 4KB ?

Regards,
        Ralf


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|  Ralf Oehler                          
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time is a funny concept
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Re: Support for sectorsizes > 4KB ?

[Alan Cox]

> In the not-so-far future there will occure MO media on the market with
> 40 to 120 Gigabytes of capacity and sectorsizes of 8 KB and maybe more.
> It's called "UDO" technology.
> 
> Is there any way to support block devices with sectors larger than 4KB =
> ?

The scsi layer itself doesn't mind, but the page caches do. Once your
block size exceeds the page size you hit a wall of memory fragmentation
issues. Given that M/O media is relatively slow I'd be inclined to say
write an sd like driver (smo or similar) which does reblocking and also
knows a bit more about other M/O drive properties.

Alan
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