gpmidi
23 Mar 2021

Overview

Thanks to a note and a good find by /u/DerUlmer I can now say there is a known way to change the zoning for the NDS-4600: 

See the section for "Changing the zoning"

https://blog.carlesmateo.com/2019/06/07/dealing-with-performance-degradation-on-zfs-draid-rebuilds-when-migrating-from-a-single-processor-to-a-multiprocessor-platform/

Steps

Note: I've not tested this (yet). 

  1. Determine the SCSI device of the chassis
    1. You can use `sg_map` or `lsblk`
    2. sg_map example:
      [root@stor0 ~]# sg_map -i|grep NDS
      /dev/sg35  NEWISYS   NDS-4600-JD       0509
  2. Set the zoning
    1. For zone config 0:
      sg_senddiag /dev/sg35  --pf --raw=04,00,00,01,50
    2. For zone config 1:
      sg_senddiag /dev/sg35  --pf --raw=04,00,00,01,51
    3. For zone config 2:
      sg_senddiag /dev/sg35  --pf --raw=04,00,00,01,52
    4. For zone config 3:
      sg_senddiag /dev/sg35  --pf --raw=04,00,00,01,53
  3. Wait 1 minute (aka `sleep 60`)
  4. Reboot the controller
    sg_senddiag /dev/sg35  --pf --raw=04,00,00,01,43
  5. Run `rescan-scsi-bus.sh` or equivalent

Zoning Configurations

 

The DAS unit's four ports per controller can be setup in four modes: 

  • Zone Config 0
    • All ports have access to all disks on both controllers
  • Zone Config 1
    • Drives 1-30 can be accessed via ports 1 and 2 on both controllers
    • Drives 31-60 can be accessed via ports 3 and 4 on both controllers
  • Zone Config 2
    • Drives 1-30 can be accessed via any port on controller 1
    • Drives 31-60 can be accessed via any port on controller 2
  • Zone Config 3
    • Drives 1-15 can be accessed via port 1 on both controllers
    • Drives 16-30 can be accessed via port 2 on both controllers
    • Drives 31-45 can be accessed via port 3 on both controllers
    • Drives 46-60 can be accessed via port 4 on both controllers

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