On 10/07/2016 03:15 PM, Xose Vazquez Perez wrote:
System Vendor Product Multipathing Policy
=============== ====== ================ =======================
FlashSystem 710 IBM FlashSystem Symmetric Active/Active
FlashSystem 720 IBM FlashSystem Symmetric Active/Active
FlashSystem 810 IBM FlashSystem Symmetric Active/Active
FlashSystem 820 IBM FlashSystem Symmetric Active/Active
FlashSystem 840 IBM FlashSystem-9840 Symmetric Active/Active
FlashSystem 900 IBM FlashSystem-9840 Symmetric Active/Active
Based on documentation from the manufacturer:
http://www.redbooks.ibm.com/redbooks/pdfs/sg248271.pdf
IBM RedBooks are more like descriptions for one particular use case as
described in the book rather than reference manuals.
Product documentation is elsewhere and also updated more often (like
each product release) than a RedBook.
E.g. for IBM FlashSystem 900:
http://www.ibm.com/support/knowledgecenter/STKMQB/com.ibm.storage.flashsystem900.1.2.doc/tms_multipathing.html
You'll notice that we from Linux on s390x have a bit different
recommendations for some of the values (no_path_retry actually depends
on whether you have a cluster software/filesystem that can cope with EIO
on last-path-loss. Currently, I see the default without that, i.e.
non-clustered from which we would like to hide any path issues).
Is there some way to have "dependent" settings?
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx>
Cc: device-mapper development <dm-devel@xxxxxxxxxx>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@xxxxxxxxx>
---
libmultipath/hwtable.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
index e1b055a..ff6989d 100644
--- a/libmultipath/hwtable.c
+++ b/libmultipath/hwtable.c
@@ -522,6 +522,13 @@ static struct hwentry default_hw[] = {
.no_path_retry = NO_PATH_RETRY_QUEUE,
.pgpolicy = MULTIBUS,
},
+ {
+ /* FlashSystem 710/720/810/820/840/900 */
+ .vendor = "IBM",
+ .product = "FlashSystem",
+ .no_path_retry = NO_PATH_RETRY_FAIL,
+ .pgpolicy = MULTIBUS,
+ },
/*
* IBM Power Virtual SCSI Devices
*
--
Mit freundlichen Grüßen / Kind regards
Steffen Maier
Linux on z Systems Development
IBM Deutschland Research & Development GmbH
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschaeftsfuehrung: Dirk Wittkopp
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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