Re: [Xen-devel] [Patch 0/7] pvSCSI driver

[James Smart <James.Smart@xxxxxxxxxx>]

James Harper wrote:
> This reset stuff seems like a lot of extra work for probably not much
> benefit though.
This ends up being the crux of it...

It all depends on how important the use of scsi is to the consumer.  In 
otherwords,
a scsi disk, layered under LVM, filesystems, etc, the nuances of the resets and
inter-relations between luns and targets isn't that meaningful and they will 
happily
live in a world with these things are emulated.

However, if the scsi disk is talked to directly via things like sg tools, or 
things
like multipathing software (where failover is disk & target specific), it 
matters
more.

And if the scsi disk is handed all the way to the database, it matter *much* 
*much*
more.  In fact, this is one reason you find very enterprise databases supported 
in
virtualized environments.

All this hints at levels of pass-thru. Granted, you can always take one step at 
a time.

-- james

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