cant see LUN in citrix xen server

[robert wild1709160729]

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

[Tobias Kreidl]

The storage device is aware of the XS hosts' WWNN values and permission was granted for the hosts to access the storage device?

[robert wild1709160729]

Thanks Tobias,

So aswell as giving my San my HBA wwpn's I also have to give it my xen server wwnn?

 

Also do you think i should only give it my HBA's wwnn and not each wwpn's

 

[Tobias Kreidl]

Your FC controllers on your XenServer will have their own WWNNs. I don't recall ever having to deal with WWPNs, just WWNNs. I admit, it's been a number of years since I had any FC devices! See if this adds any help: https://discussions.citrix.com/topic/282584-adding-a-fibrechannel-hba-after-installing-xenserver/

 

-=Tobias

[robert wild1709160729]

you know what i was doing everything right, looks like my FC HBA card isnt supported for xen server 7.6

 

its a ISP2532

 

and on the list

 

http://hcl.xenserver.org/storagecontrollers/?storagecontrollersupport__version=14&vendor=48&features=1

[Tobias Kreidl]

Just because it's not on the list doesn't necessarily mean it won't work; did it work in earlier XS releases?

Also, you may need a driver update. Do you have Citrix support? If so, I'd open a case with them.

 

-=Tobias

[robert wild1709160729]

No citrix support I'm afraid

 

I didnt have a previous xen installed Im afraid, I installed 7.6

 

Il try and update the driver via cli on the xen host and see if that works

 

What is the Linux version, is it freebsd or centos7

 

Thanks Tobias for your help in this

[David Clark1709160691]

CentOS

[Tobias Kreidl]

XS 7.6 uses CentOS 7 with kernel version 4.4.0, I believe.

[robert wild1709160729]

Good news, my storage ie SAN i can now see my wwpn/wwnn under hosts so a step in the right direction

 

How big should I make the Luns ie is there a max size citrix xen can support ie 2tb or 30tb

 

 

[Alan Lantz]

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--

 

[Tobias Kreidl]

You can make the SR huge -- I think several TB, just each VDI (storage device per VM) cannot exceed 2 TB.

 

-=Tobias