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cant see LUN in citrix xen server


robert wild1709160729

Question

hi all,

i can see my fibre HBA card in the console of my xen server and they are host 7 and host 8, also i know what port names they are like so -

 

ls /sys/class/fc_host/
host7 host8

 

[root@lon-p-xenserver01 ~]# cat /sys/class/fc_host/host7/port_name
0x50014380062e53ac

 

[root@lon-p-xenserver01 ~]# cat /sys/class/fc_host/host8/port_name
0x50014380062e53ae

 

and on my hitachi SAN i have created a volume, made a LUN on the volume and associated my host name ie my port name to the LUN so it should really see it

 

back on my xen server when i rescan for LUNS i dont see my LUNS -

 

[root@lon-p-xenserver01 ~]# echo "- - -" > /sys/class/scsi_host/host7/scan


[root@lon-p-xenserver01 ~]# echo "- - -" > /sys/class/scsi_host/host8/scan


[root@lon-p-xenserver01 ~]# cat /proc/scsi/scsi


Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA     Model: WDC WD1001FALS-4 Rev: 3D06
  Type: Direct-Access                   ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA     Model: Hitachi HUA72202 Rev: A3EA
  Type: Direct-Access                   ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA     Model: Hitachi HUA72202 Rev: A3EA
  Type: Direct-Access                   ANSI SCSI revision: 05
Host: scsi3 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA     Model: Hitachi HUA72202 Rev: A3EA
  Type: Direct-Access                   ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
  Vendor: HL-DT-ST Model: BD-RE WH14NS40 Rev: 1.02
  Type: CD-ROM                         ANSI SCSI revision: 00
Host: scsi6 Channel: 00 Id: 01 Lun: 00
  Vendor: hp     Model: BD-RE BH30L   Rev: B633
  Type: CD-ROM

 

any help please

cheers,

rob

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11 answers to this question

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I think you are going to only be limited by the storage array.  I'm sure there is a limit, but its

got to be crazy high.  Doing a quick Google I ran across 8 ExaBytes. Don't know how accurate

that is, but again, its going to be high.

 

But, that being said, a lot of storage arrays will suggest you break your LUN's out into something 

a little more logical. Deduplication and compression may say to to keep some data on the same

LUN. Keeping data with the same block size will as well. And it can be an organizational tool. 

Instead of one giant LUN having multiple LUN's can reduce outage if a LUN goes offline.

 

--Alan--

 

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