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2190
June 23rd, 2010 09:00
Single Power Supply on NS120
We have an NS120 installed, storing production datastores for a group of ESX servers. An unfortunatle requirment has risen and I need to replace some PDUs in that RACK. My plan has been to verify the redundant power for everything in the NS120 and then disconnect and reconnect to the new PDU.
However, I have come across one particular appliance in the NS120 stack that only has a single power source. This is the appliance that has the management port connected to it as well as the DVD on the front.
I have discussed this with a few EMC folks and everyone says it would probably be ok, just give the device a graceful shutdown and that it is merely running the management environment, i.e. the webserver and all that entails.
No doubt about it, this device only has one power source. Common sense tells me this highly available storage environment is not ultimately dependant on an appliance that has only one power source. But again, I am skeptical and will not bet ungraceful downtime on common sense.
Has anyone downed this appliance while still servicing IO requests, particularly on an NS120?
I have added an image of the NS120 and circled the single power source.
Thanks,
Bart
dynamox
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June 23rd, 2010 12:00
/sbin/halt from command line
dynamox
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June 23rd, 2010 09:00
this is the control station, i would not worry about it as the NAS unit itself will continue functioning without it while you are recabling it. There are other NS models that come with dual control stations so you can proactively failover/failback control station.
nandas
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June 23rd, 2010 10:00
As "dynamox" mentioned this is the Control station - which is the management and monitoring interface. You may run without the control station with no management and monitoring during that period. NS120 does not have any option to put the secondary control station - which is an option with some higher level models.
Please refer to the "EMC Celerra Network Server System Operations"Technical document available on Powerlink or on the documentation CD which provides all the details and steps needed for the same.
Please be careful about the shutdown/reboot process for the Control station - do not bring down the NAS environment. For example - # /sbin/halt will shutdown the control station only - but # /nasmcd/sbin/nas_halt will bring down the entire NAS environment.
My 2 cents,
Sandip
dynamox
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June 23rd, 2010 11:00
graceful is always preferred.
roamdeep
34 Posts
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June 23rd, 2010 11:00
Should I be concerned about shutting it down in a graceful manner or is doing it the old fashioned way acceptable?
roamdeep
34 Posts
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June 23rd, 2010 11:00
should I go to the command-line and enter shutdown now?
roamdeep
34 Posts
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June 28th, 2010 14:00
Everything went well -- the system halted and came back without skipping a beat. Thanks everyone.
Points awarded.
sebbyr
99 Posts
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July 4th, 2010 10:00
I have attached some documentation for future reference.
Thanks
- Sebby Robles
3 Attachments
NS120SBI.pdf
NS120DBI.pdf
SysOps.pdf