blk2scsa [PSARC/2007/654 FastTrack timeout 11/21/2007]

[Artem Kachitchkine]

> I'm not sure about ZFS, but it is good enough for sd(7D) with PCFS.

IMO the proposal is incomplete without a clear statement about ZFS, even 
it it's "unsupported", though I really hope for the opposite: USB 
storage is the dumbest storage I've ever encountered (so far), yet you 
can put ZFS on it.

I think the only sure way is to try. Given that the estimated 
engineering effort for this entire project is 1 engineer-week, I suppose 
it'd take a couple more days to figure this out.

> One possible area of concern for ZFS is device id functionality.  The 
> devices I'm dealing with don't have device identifiers that live within 
> the SCSI namespace.  (Generally they do have a vendor id, product id, 
> and serial number... but these are allocated from an entirely different 
> namespace.)

AFAIK in that case a fabricated devid will be stored in the hidden area 
of the disk. The same problem exists with USB, see "6422928 devid 
support is needed for usb harddisk".

-Artem