[Info-vax] VMS - The new file system. What do we know about it?...

[Dirk Munk]

Michael Moroney wrote:
> Dirk Munk <munk at home.nl> writes:
>
>> Modern disks of course use the Advanced Format structure, with 4kB
>> blocks/sectors. Using arbitrary 512 byte blocks is possible, but not
>> very good for performance. Is that taken into consideration?
>
> That will have to be a separate project.  From what someone here told me
> other OS's (Linux, Windoze) still use 4K block drives in 512 byte block
> emulation mode.  Can anyone verify/refute this?
>
> Also, most VMS IO on itanics is through SAN storage servers, and they
> are the ones that have to directly deal with 4K blocks.  I don't know
> if storage servers themselves present themselves as using 4K blocks.

No they don't as far as I'm aware. Block storage usually consists out of 
RAID sets, and a RAID set uses a stripe size. For optimal performance 
you should take the stripe size into consideration when formatting a disk.

>
> Of course there are directly attached SCSI drives that could benefit,
> plus x86 is a different beast.
>