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--- linux:multipath [2016/09/02 10:40]
vondra
+++ linux:multipath [2017/03/13 17:24] (current)
tomsa [Manual failover]
@@ Line 1: / Line 1: @@
 ===== Multipath =====
+Zakladni prikazy:
+  * zobrazeni aktivnich multipathu: <code bash>multipath -ll</code>
+  * reload podle kofigurace: <code bash>multipath -v2</code>
 ====Vzorova konfigurace====
   * nastavuje failover nad storage pripojnou pomoci FC a iSCSI
   * blacklistuje vsechna zarizeni mimo tech s wwid uvedenym v blacklist exceptions
   * multipathy uvadime v sekci multipaths, aby dostali hezke jmeno :)
-<code>
+<code json>
 blacklist {
         wwid .*
@@ Line 32: / Line 35: @@
 </code>
+====Pridani noveho multipath zarizeni====
+  * pridavame zarizeni jehoz jedna z cest je /dev/sdh
+  * zjistime si jeho scsi_id (wwid) nasledujicim prikazem: <code bash>/lib/udev/scsi_id -u -g -v /dev/sdh
+2317936357870636c
+</code>
+  * pridame ho do konfigurace do sekce blacklist_exceptions (oddelovac je |):<code>wwid "26261353635663533|2317936357870636c"</code>
+  * dale do sekce multipaths pridame jeho zaznam:<code>
+multipath {
+        wwid              2317936357870636c
+        alias             mach3
+}
+</code>
+  * nacteme konfiguraci:<code>
+multipath -v2
+create: mach3 (2317936357870636c) undef SCST_FIO,raid-disk
+size=9.1T features='0' hwhandler='0' wp=undef
+|-+- policy='service-time 0' prio=1 status=undef
+| `- 1:0:2:1  sdh  8:112  undef ready running
+`-+- policy='service-time 0' prio=1 status=undef
+  `- 15:0:0:1 sdj  8:144  undef ready running
+</code>
+  * overime, ze multipath funguje:<code>
+multipath -ll
+backup (26261353635663533) dm-0 SCST_FIO,raid-disk
+size=11T features='0' hwhandler='0' wp=rw
+|-+- policy='service-time 0' prio=1 status=active
+| `- 1:0:1:1  sddf 70:208 active ready running
+`-+- policy='service-time 0' prio=1 status=enabled
+  `- 14:0:0:1 sdm  8:192  active ready running
+mach3 (2317936357870636c) dm-80 SCST_FIO,raid-disk
+size=9.1T features='0' hwhandler='0' wp=rw
+|-+- policy='service-time 0' prio=1 status=active
+| `- 1:0:2:1  sdh  8:112  active ready running
+`-+- policy='service-time 0' prio=1 status=enabled
+  `- 15:0:0:1 sdj  8:144  active ready running</code>
+  * vzniklo nam zarizeni /dev/mapper/mach3, ktere pouzivame stejne jako jakekoli jine blokove zarizeni
+====Manual failover====
+) vyradit jednu z cest
+<code bash>
+echo offline > /sys/block/ [device name] /device/state
+</code>
+) cestu vratit zpet
+<code bash>
+echo running > /sys/block/ [device name] /device/state
+</code>
+Je to vhodne udelat po automatickem failover v pripade, ze se prepne cesta z fc na iscsi. Je nastaveno nevracet se zpet, takze zabitim aktivniho ISCSI donutime multipath zase zacit pouzivat FC

linux/multipath.1472805620.txt.gz · Last modified: 2016/09/02 10:40 by vondra