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This BZ is for adding scsi-block fixes to qemu-kvm-rhev, needed for MS cluster services.

See upstream work:

[Qemu-devel] [PATCH 0/4] scsi-block: receive the right SCSI status on reads and writes
http://marc.info/?l=qemu-devel&m=146296689703152&w=2

"scsi-block uses the block layer for reads and writes in order to avoid
allocating bounce buffers as big as the transferred data.  We know how
to split a large transfer to multiple reads and writes, and thus we can
use scsi-disk.c's existing code to do I/O in multiple chunks (for non-s/g
SCSI hosts) or through the DMA helpers (for s/g SCSI hosts).

Unfortunately, this has the side effect of eating the SCSI status except
in the very few cases where we can convert an errno code back to a SCSI
status.  It puts a big wrench in persistent reservations support in the
guest, for example.

Luckily, splitting a large transfer into multiple SBC commands is just as
easy, and this is what the last patch does.  It takes the original CDB,
patches in a modified starting sector and sector count, and executes the
SCSI command through blk_aio_ioctl.  It is also easy to pass a QEMUIOVector
to SG_IO, so that s/g SCSI hosts keep the performance."

Fix included in qemu-kvm-rhev-2.6.0-5.el7

Fix included in qemu-kvm-rhev-2.6.0-6.el7

Created attachment 1203599 [details]
storage validate testing result

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2673.html