This allows the sd driver to retry commands like read capacity until a
LUN is ready, rather than giving up after three retries.
In NetApp E-Series, a controller can return not ready like this when it
quiesces I/O on the controller that just came on the network, during a
firmware upgrade procedure, and retrying the command at the midlayer
will allow the discovery to complete, successfully.
Signed-off-by: Sean Stewart <sean.stewart@xxxxxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 5248c88..95d87fe 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -454,6 +454,11 @@ static int alua_check_sense(struct scsi_device *sdev,
{
switch (sense_hdr->sense_key) {
case NOT_READY:
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
+ /*
+ * LUN Not Ready -- In process of becoming ready
+ */
+ return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0a)
/*
* LUN Not Accessible - ALUA state transition
--
1.8.3.1
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