Difference between revisions of "6TB storage expansion"

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  # echo 1 > /sys/block/device_name/device/rescan
 
  # echo 1 > /sys/block/device_name/device/rescan
  
However, under /sys/block/dm-6, there is no device subdirectory, and, needless to say, no rescan file.
+
However, under /sys/block/dm-6, there is no device subdirectory, and, needless to say, no rescan file. Mind, this is for SCSI.
  
 
= Links=
 
= Links=

Revision as of 13:00, 23 June 2016

Introduction

56 instead of 50TB are now available for the bioinformatics cluster. The tasks required to realize this extra space are:

  • rescan multipath, details: multipath WWID; 36000d3100051f800000000000000016e (on mpathd)


Tools

multipath -l

will give a useful if not very understandable list of characteristics. Most important, the device: dm-6 is noted, i.e.

mpathd (36000d3100051f800000000000000016e) dm-6 COMPELNT,Compellent Vol
size=50T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
  |- 6:0:0:1 sdd 8:48 active undef running
  |- 7:0:1:1 sde 8:64 active undef running
  |- 6:0:1:1 sdg 8:96 active undef running
  `- 7:0:2:1 sdf 8:80 active undef running
/etc/multipath.conf

Doesn't really have much. The only actives are:

blacklist {
    wwid 3600605b006c5f11019eadc840e589ae9
    wwid 3600605b006a1af8019ee9a2d1036bfa7
    wwid 3600605b006a1af801b46c4773d54b7d4
}

Procedure

The rescan operation is most definitely required. Both Red Hat and Ubuntu guides give the same method of doing this

# echo 1 > /sys/block/device_name/device/rescan

However, under /sys/block/dm-6, there is no device subdirectory, and, needless to say, no rescan file. Mind, this is for SCSI.

Links