reservation text updates

diff --git a/scsi_nvme_middle.xml b/scsi_nvme_middle.xml
index 36f589ff4c7481b312b0927dd01c0d2aed1441ae..0e960b098efc80e3397ec2ba04a1be5df6236767 100644 (file)
--- a/scsi_nvme_middle.xml
+++ b/scsi_nvme_middle.xml
@@ -98,6 +98,12 @@
       PERSISTENT RESERVE OUT SCSI command to NVMe commands which
       SHOULD be used when using NVMe devices as storage devices
       for the pNFS SCSI layout.
+
+      One important difference between SCSI and NVMe Persistent Reservations
+      is that NVMe reservation keys always apply to all controllers used by
+      a host (as indicated by the NVMe HOSTID).  This behavior is somewhat
+      similar to setting the ALL_TG_PT bit when registering a SCSI
+      Reservation key, but actually guaranteed to work reliably.
     </t>
   </section>