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diff --git a/sys/cam/scsi/scsi_da.c b/sys/cam/scsi/scsi_da.c
index e8e13613413a..f2f3951ebe80 100644
--- a/sys/cam/scsi/scsi_da.c
+++ b/sys/cam/scsi/scsi_da.c
@@ -1899,7 +1899,15 @@ dastrategy(struct bio *bp)
cam_periph_lock(periph);
/*
- * If the device has been made invalid, error out
+ * If the pack has been invalidated, fail all I/O. The medium is not
+ * suitable for normal I/O, because one or more is ture:
+ * - the medium is missing
+ * - its size is unknown
+ * - it differs from the medium present at daopen
+ * - we're tearing the cam periph device down
+ * Since we have the cam periph lock, we don't need to check it for
+ * the last condition since PACK_INVALID is set when we invalidate
+ * the device.
*/
if ((softc->flags & DA_FLAG_PACK_INVALID)) {
cam_periph_unlock(periph);
@@ -1946,6 +1954,10 @@ dadump(void *arg, void *virtual, off_t offset, size_t length)
softc = (struct da_softc *)periph->softc;
secsize = softc->params.secsize;
+ /*
+ * Can't dump to a disk that's not there or changed, for whatever
+ * reason.
+ */
if ((softc->flags & DA_FLAG_PACK_INVALID) != 0)
return (ENXIO);
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