Re: [Xen-devel] [RFC PATCH] Data integrity extension support for xen-block

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

David Vrabel writes ("Re: [RFC PATCH] Data integrity extension support for 
xen-block"):
> You need to read the relevant SCSI specification and find out what
> interfaces and behaviour the hardware has so you can specify compatible
> interfaces in blkif.
> 
> My (brief) reading around this suggests that the integrity data has a
> specific format (a CRC of some form) and the integrity data written for
> sector S and retrieved verbatim when sector S is re-read.

I think it's this:

https://en.wikipedia.org/wiki/Data_Integrity_Field
https://www.kernel.org/doc/Documentation/block/data-integrity.txt

In which case AFAICT the format is up to the guest (ie the operating
system or file system) and it's opaque to the host (the storage) -
unless the guest consents, of course.

Ian.

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