Question

Hyperscale x does not detect Sandisk automatically

  • 20 January 2023
  • 6 replies
  • 174 views

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i*m using Hyperscale x nodes that are also Vsaproxys
when adding a new Fcdisk to the node it will not be discoverd automatically.

Is there an option to let discover the Hyperscale node the SAN Disk.

 

..Chr 


6 replies

Userlevel 1
Badge +7

Hi Chr…

HS-X is build on Linux OS, therefore you need to rescan the scsibus to discover/create new devices.

automatic scan is only done during reboot or when mapping a new target, but not a new LUN.

try something like :

scan-scsi-bus.sh -r -f -m -w –hosts=$(cd /sys/class/fc_host;ls -xd *|sed -e ‘s/ /,/g’)

this re-scans the targets connect to FC Hosts only.
If you map LUNs with very high LUN IDs, you might also need to modify the 
/etc/default/grub and for LUN support of up to 4096 LUNS, add scsi_mod.max_luns=4096 to the GRUB_CMDLINE_LINUX parameter

I also created a workflow, that daily runs this scsi-scan on all HS-X Nodes to update the SCSI configuration, in case new LUNs have been introduced.

Klaus

Badge +1

would this be an option

copy the rescan-scsi-bus.sh script to the /etc/cron.daily/

 

Userlevel 2
Badge +11

i*m using Hyperscale x nodes that are also Vsaproxys
when adding a new Fcdisk to the node it will not be discoverd automatically.

Is there an option to let discover the Hyperscale node the SAN Disk.

 

..Chr 

 

Hi, I believe that soon I will face the same situation. I would like to confirm your scenario.

When you say that HSX does not see the LUNs automatically, is this during a backup operation? I believe you are using SAN transport mode, right?

You'll have to manually go to the HSX nodes and scan the SCSI bus everytime there's a backup operation?

Userlevel 2
Badge +11

Hi Chr…

HS-X is build on Linux OS, therefore you need to rescan the scsibus to discover/create new devices.

automatic scan is only done during reboot or when mapping a new target, but not a new LUN.

try something like :

scan-scsi-bus.sh -r -f -m -w –hosts=$(cd /sys/class/fc_host;ls -xd *|sed -e ‘s/ /,/g’)

this re-scans the targets connect to FC Hosts only.
If you map LUNs with very high LUN IDs, you might also need to modify the 
/etc/default/grub and for LUN support of up to 4096 LUNS, add scsi_mod.max_luns=4096 to the GRUB_CMDLINE_LINUX parameter

I also created a workflow, that daily runs this scsi-scan on all HS-X Nodes to update the SCSI configuration, in case new LUNs have been introduced.

Klaus

 

Hi Klaus,

 

Is this a supported solution? I mean, customizing those steps would interfere with support? Shouldn't this be ready from factory? It looks like a workaround...

Userlevel 2
Badge +11

Hi Chr…

HS-X is build on Linux OS, therefore you need to rescan the scsibus to discover/create new devices.

automatic scan is only done during reboot or when mapping a new target, but not a new LUN.

try something like :

scan-scsi-bus.sh -r -f -m -w –hosts=$(cd /sys/class/fc_host;ls -xd *|sed -e ‘s/ /,/g’)

this re-scans the targets connect to FC Hosts only.
If you map LUNs with very high LUN IDs, you might also need to modify the 
/etc/default/grub and for LUN support of up to 4096 LUNS, add scsi_mod.max_luns=4096 to the GRUB_CMDLINE_LINUX parameter

I also created a workflow, that daily runs this scsi-scan on all HS-X Nodes to update the SCSI configuration, in case new LUNs have been introduced.

Klaus

Hello Klaus, can you share how you created that workflow to execute the rescan in the HSX nodes?

Userlevel 1
Badge +13

@Chr... 

is the below worked for you ?

would this be an option

copy the rescan-scsi-bus.sh script to the /etc/cron.daily/

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