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RAID (Redundant Array of Independent Disks) Support on SRX4600 Services Gateway

 

The SRX4600 Services Gateway is shipped with two field-replaceable 1-TB solid-state drives (SSDs). The SSDs are for storage and they are Field Replaceable Units (FRUs). SRX4600 is shipped with Junos OS installed only on one SSD and if you want the other SSD to be a redundant SSD you need to manually configure RAID once in BIOS setting.

By enabling RAID on SRX4600, all the data will be synced between the SSDs and if one of the SSDs fails, the other SSD will become active.

Note

On the SRX4600 Services Gateways, RAID is supported from Junos OS 20.1R1 and above. To enable RAID, the BIOS version of the services gateway should be version v15. By upgrading or installing Junos OS 20.1R1, the BIOS version is automatically upgraded to version v15.

RAID Configuration in BIOS

Note

All the existing data will be lost after you enable/disable RAID so you should use a bootable USB flash drive or configure PXE server to install Junos OS on the SSD. See Maintaining the SRX4600 SSD.

To configure RAID you have to manually make the following changes in the BIOS settings:

  1. Change the Hard disk Controller (HDC) Configuration
    1. From the console reboot the services gateway through the CLI by using the request system reboot command.

    2. When the services gateway begins to reboot, within a gap of three seconds press Esc key on your console keypad to enter the BIOS menu.

      Note

      If you miss pressing Esc key on your console keypad within three seconds while the services gateway is rebooting, you will have to reboot the services gateway again.

    3. From the BIOS menu, navigate to Setup Utility—>Advanced—>PCH SATA Configuration—>HDC Configure As.

    4. Change AHCI to RAID. By default the HDC is configured as AHCI.

      Note

      All the existing data will be lost after you enable/disable RAID.

    5. Save the configuration and return to BIOS main menu to configure RAID volume.

  2. Configure RAID Volume
    1. From the BIOS menu, navigate to Device Management—>Intel(R) RSTe SATA Controller.

    2. Configure RAID level as RAID1

    3. Select the disks, Port 4 and Port 5

    4. Select Create Volume.

    5. Press F10 on your console keypad to save the configuration and exit BIOS settings.

    6. Wait for the services gateway to reboot.

Disable RAID Configuration in BIOS



To disable the RAID configuration you have to manually make the following changes in the BIOS settings:

  1. From the console reboot the services gateway through the CLI by using the request system reboot command.
  2. When the services gateway begins to reboot, within a gap of three seconds press Esc key on your console keypad to enter the BIOS menu.Note

    If you miss pressing any key on your console keypad within three seconds while the services gateway is rebooting, you will have to reboot the services gateway again.

  3. From the BIOS menu, navigate to Device Management—>Intel(R) RSTe SATA Controller and delete RAID Volume.
  4. Save the configuration and return to BIOS main.
  5. From the BIOS menu, navigate to Setup Utility—>Advanced—>PCH SATA Configuration—>HDC Configure As.
  6. Change RAID to AHCI.Note

    All the existing data will be lost after you enable/disable RAID.

  7. Press F10 on your console keypad to save the configuration and exit BIOS settings.
  8. Wait for the services gateway to reboot.

Replacing an SSD in RAID Configured SRX4600 Services Gateway

This topic explains how to replace an Solid State-Drive (SSD) if RAID (Redundant Array of Independent Disks) is configured on your SRX4600 Services Gateway.

The two SSDs installed in the SRX4600 Services Gateway are field-replaceable unit (FRUs). You need not power off the SRX4600 Services Gateway to replace a faulty or a corrupted SSD from the services gateway. If one SSD stops functioning the other SDD become active.

When you are replacing a faulty SSD with a new SSD that has no Junos OS installed on it or if you have to reinstall the corrupted Junos OS image on the SSD, you should use a USB flash drive to install the Junos OS.

Ensure that you have the following equipment available:

  • Electrostatic discharge (ESD) grounding strap

  • An antistatic bag or an antistatic mat

  • SSD to replace

To replace a faulty or corrupted SSD:

  1. Login to the Host OS system by using the vhclient –s command.
    user@host:~# vhclient -s
  2. You can’t remove an SSD directly from the RAID array, unless it is failed. If you want to remove a working SSD, you first have to fail it using the mdadm --fail /dev/md126 /dev/sdb command.

    In this example, the SSD name is /dev/sdb.

  3. To remove an already failed SSD from the RAID array, you can directly use the mdadm --remove /dev/md/imsm0 /dev/sdb command.
  4. Follow the steps in Maintaining the SRX4600 SSD to replace an SSD.
  5. Check the new SSD number using the fdisk -l command.
  6. Add the new SSD to the RAID array using the mdadm -a /dev/md/imsm0 /dev/sdc command.

    In this example the SSD name is /dev/sdc.

  7. After adding the SSD, go back to Junos prompt by using the exit command.
    user@host:~# exit
    user@host:/var/tmp #
  8. Check the status of RAID using the show chassis raid status command and RAID members using the show chassis raid members command.
    user@host:~# show chassis raid status
    user@host:~# show chassis raid members