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VTrak Ex10 How to attach VTrak J-Class chassis to running E-Class or E-Class/J-Class configuration without powering off the subsystems.
Ken Chou posted this 25 October 2011

Option 1: Attaching additional J-Class with unconfigured hard disk drives currently installed.

  1. Be sure the new J-Class system is powered off.
  2. Temporarily unlatch all disks installed in the JClass chassis.
  3. Connect the SAS cables from the JClass chassis to the currently powered on and running E-Class or last J-Class in the chain. The connection go from Circle on the last device in the running enclosures to the Diamond input SAS connection on the new J-Class chassis.
  4. Power on the newly installed J-Class chassis.
  5. Once the new J-Class is up and running, verify that the E-Class can see the newly attached chassis by checking in WebPam or CLI. If the chassis is not detected, please contact Promise Technical Support for assistance.
  6. If the enclosure is seen, now it is safe to hot plug the unconfigured drives into the JClass chassis.
  7. Once all disks are detected, you will be able to create arrays and logical drives as needed.

Option 2: Removing a running J-Class with an arrays already configured and moving from one subsystem to another.

  1. Before shutting down and detaching the running J-Class, log into WebPAM or CLI and put the array into a 'Transit' state.
  2. Once the array is in Transit state, unlatch the disks from the chassis to be removed. Note this chassis must be the last chassis in the SAS cable chain.
  3. After unlatching the drives, power off the VTrak and detach the SAS cables.

At this point the JClass can be removed and/or moved to another E-Class or E/J-Class combination

  1. Connect the SAS cables from the JClass chassis to the currently powered on and running E-Class or last J-Class in the chain. The connection go from Circle on the last device in the running enclosures to the Diamond input SAS connection on the new J-Class chassis.
  2. Power on the newly installed J-Class chassis.
  3. Once the additional J-Class is up and running, verify that the E-Class can see the newly attached chassis by checking in WebPam or CLI. If the chassis is not detected, please contact Promise Technical Support for assistance.
  4. If the enclosure is seen, now it is safe to hot plug the drives that are in Transit mode into the JClass chassis.
  5. Once all drives are installed, the array will come out of Transit mode and be put online so the array and logical drives can be seen.

VESS Other What is the power consumption and heat dissipation of the VessRAID?
Ken Chou posted this 04 June 2011

You may need to calculate the power consumption and heat dissipation of a new storage susbsystem to see if your power load center and air conditioning can support the additional load, so you refer to the VessRAID datasheets. The VessRAID 1840 datasheets list the following power information:

VR1840i
Current (Maximum): 7/8A (100V); 3.5/4A (240V)
Power Consumption: 242.8Watts (w/ SAS drives), 72.2Watts (w/o drives)

VR1840f
Current (Maximum): 8A (100V); 4A (240V)
Power Consumption: 241.8Watts (w/ SAS drives), 51.3Watts (w/o drives)

For 120VAC operation the maximum possible current that the two power supplies could draw is:
450W / 120VAC = 3.75A each, for a total of 7.5A @ 120VAC or 3.75A @ 240VAC

However the total peak (worst case) current draw on the power supplies by the subsystem with 16 15K RPM SAS drives is around 3.75A @ 120VAC or 1.57A @ 240VAC.

This is based on the total startup load of the 16 SAS drives and the startup load of the RAID controller and the enclosure, which is approximately 120W: 256W + 120W = 376W / 120V = 3.75A.
For 16 SATA drives the startup load would be: 144W + 120W = 264W / 120V = 2.2A.

This startup load is momentary and is well within the design limits of the power supply units.

More important for these load and heat calculations is the operational average, or how much power will be used during operation.

The overall startup and operational loads will vary with the drive type used in the enclosure; here are some typical 2TB drive power consumption values:

Type
 RPM
 Typical W
 Idle W
 SAS 15K
  16  12
 SAS  7200  10  7
 SATA  7200  9  6






For 1TB drives the power used is approximately 20% less, and for 500GB drives 40% less.


From the datasheets we can see that the operational average for the two product versions are 72W and 51W without any drives.

To calculate the typical power consumption of the VessRAID iSCSI subsystem:
16 SAS drives @ 16W = 256W + Controller @ 72W = 328W
16 SATA drives @ 9W = 144W + Controller @ 72W = 249W

To calculate the approximate BTUs generated for any cooling requirements:
16 SAS drives: Heat dissipation = 328W x 3.413 = 1120 BTU
16 SATA drives: Heat dissipation = 249W x 3.413 = 850 BTU

For the VessJBOD the IO module consumes around 20W, so just subtract 52W from these results.


To calculate the typical power consumption of the VessRAID FC8 subsystem:
16 SAS drives @ 16W = 256W + Controller @ 51W = 307W
16 SATA drives @ 9W = 144W + Controller @ 51W = 195W

To calculate the approximate BTUs generated for any cooling requirements:
16 SAS drives: Heat dissipation = 307W x 3.413 = 1048 BTU
16 SATA drives: Heat dissipation = 195W x 3.413 = 666 BTU

For the VessJBOD the IO module consumes around 20W, so just subtract 31W from these results.

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