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April 30th, 2018 06:00
VNX 5500 Power Protection
Hi good people,
We are running EMC VNX 5500 and we had a major power outage where we lost both standby power supplies (SPS). We are now not able to access Unisphere and we can only access individual SPUs from the web.Our power environment is such that our power supplies are fed from different power feeds. We urgently want to do maintenance on one of the power feeds to storage processor A so l was asking 2 questions:
- How do l gracefully shut down the storage array without Unisphere
- If we switch off power to one power supply , what will happen to the disk arrays in that storage processor ? will they be automatically migrated to storage processor B ?
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kelleg
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May 2nd, 2018 08:00
The SPS (Standby Power Supply) is actually a battery backup for each SP. You need to have at least one SPS running to maintain the System Wrtie Cache on the array. If you're SPS's are both not working, then Write Cache will be disabled on the array. The array will work with out System cache, but performance will be very slow.
In the VNX Command Line Reference Manual you can find a shutdown command. This is power off the whole array.
https://support.emc.com/docu41553_VNX_Command_Line_Interface_Reference_for_Block.pdf?language=en_US
shutdown
Shuts down and powers off the system
EXAMPLE
This command shuts down and powers off the specified system.
naviseccli -h ss1_spa shutdown
Before you shutdown the system, stop all I/O from
any servers connected to the system and save all
unsaved data to disk. During the shutdown process you
will lose access to all data on the LUNs but you will not
lose any data. When you power up the system you
will regain access to the LUNs.
Do you want to shutdown and power off the subsystem now
(y/n)?
You can also use the following command to shutdown one Storage Processor. When one Storage Processor (SP) shuts down all the LUNs owned by that SP will trespass its LUNs to the other SP. The disks in the array have two power supplies - if you remove power on one side of the cabinet, the other side provides power to the disks. FYI Disks as opposed to LUNs.
shutdownsp
Shuts down and powers off the current SP
EXAMPLE # 1
This command shuts down and powers off the current storage processor (SP). The
confirmation message for AX4-5 series system is as follows:
naviseccli -h ss1_spa shutdownsp
This operation will shutdown and power off the SP.
To reconnect please reboot the SP or manually power up by
pushing the power button on the system. Before you shut
down the SP, first verify that each server has failover
software and has a working path to a port on both SPA and
SPB. If you do not, stop I/O from the server(s) without
a path to each SP, to prevent losing access to your data.
Do you want to shutdown and power off the SP now? (y/n)?
glen