Power-up and Power-down sequence for a CLARiiON and VNX series storage system explained briefly.

Product:

 

CLARiiON CX, CX3, CX4 Series, CLARiiON iSCSI Array, Unified VNX Block

 

Description:

 

The best procedure to Power-up and Power-diown a CLARiiON and VNX series array is as follows.

 

Resolution:


 

Powering up the storage system

 

  1. Verify the following:
  • Master switch/circuit breakers for each cabinet/rack power strip are off.
  • The power cord for SP A is plugged into the SPS and the power cord retention bails are in place.
  • The power cord for SP B is plugged into the nearest power distribution unit on a different circuit feed from the SPS and power cord retention bails are in place. (In systems with two SPSs, plug SP B into its corresponding SPS.)
  • The serial connection between management module A and the SPS is in place. (In systems with two SPSs, each management module has a serial connection to its corresponding SPS.)
  • The power cord for LCC A on the first DAE (EA 0, bus 0; often called the DAE-OS) is plugged into the SPS and the power cord retention bails are in place.
  • The power cord for LCC B is plugged into the nearest power distribution unit on a different circuit feed than the SPS. (In systems with two SPSs, each LCC plugs into its corresponding SPS.)
  • The power cords for the SPSs and any other DAEs are plugged into the cabinet’s power strips.
  • The power switches on the SPSs are in the on position.
  • Any other devices in the cabinet are correctly installed and ready for power-up.

 

2.   Turn on the master switch/circuit breakers for each cabinet/rack power strip.

 

In the 40U-C cabinet, master switches are on the power distribution panels (PDPs). The power-up is complete when the CPU power light on each SP is steady green. The CPU status lights are visible on the SPE when the front bezel is removed. If amber LEDs on the front or back of the storage system remain on for more than 10 minutes, make sure the storage system is correctly cabled.

 

The storage system can take 8 to 10 minutes to complete a typical power-up. Amber warning LEDs flash during the power on self-test (POST) and then go off. The front fault LED and the SPS recharge LEDs commonly stay on for several minutes while the SPSs are charging.

 

Powering down the storage system:

 

  • Stop all I/O activity to the SPE. If the server connected to the SPE is running the Linux or UNIX operating system, back up critical data and then unmount the file systems. Stopping I/O allows the SP to destage cache data, and may take some time. The length of time depends on criteria such as the size of the cache, the amount of data in the cache, the type of data in the cache, and the target location on the disks, but it is typically less than one minute. We recommend that you wait five minutes before proceeding.
  • After five minutes, use the power switch on each SPS to turn off power. Storage processors and DAE LCCs connected to the SPS power down within two minutes.
  • For a system with a single SPS, wait two minutes and then unplug the power cables for SP B on the SPE and LCC B on DAE 0, bus 0. This turns off power to the SPE and the first DAE (EA 0, bus 0). You do not need to turn off power to the other connected DAEs.

 

  • Turn off the master switch/circuit breakers for each cabinet/rack power strip to power off the rest of the DAE's.

 

Caution: Never unplug the power supplies to shut down an SPE. Bypassing the SPS in that manner prevents the storage system from saving write cache data to the vault drives, and results in data loss. You will lose access to data, and the storage processor log displays an error message similar to the following: Enclosure 0 Disk 5 0x90a (Can’t Assign - Cache Dirty) 0 0xafb40 0x14362c.

 

Please refer to Primus article “emc252999” for more information on the safe Procedure to power-up and power-down the CX4 CLARiiON Array.