3w-9xxx: scsi0: AEN: INFO (0x04:0x0053): Battery capacity test is overdue:.
When I'm in the CLI console (tw_cli) and tries to test the battery, I'm seeing the following:
//vpsXX1> /c0/bbu test
Depending on the Storsave setting, performing the battery capacity test may disable the write cache on the controller /c0 for up to 24 hours.
Do you want to continue ? Y|N [N]:
This is a live production server with client VPSs on it. Anyone here actually did 3ware battery test before on production system? Is it ok to do this? I'm seeking someone actually performed test operation before, not from someone just assumes it will be ok.
Thanks for any inputs! Cheers!
SysAdmin.xyz Having severs with customer data on it without proper monitoring is like having one night stand without using protections - eventually, there will be an 'oh s**t!' moment.
Disabling the write cache is going to slow things down a bit for the duration of the test although it won't necessarily be for 24 hours as it varies. I'd pick a slow day to do it, however you *should* run that test at least once if you never have before.
You'll notice i/o wait go up a bit depending on how your server works. Assuming it's not being pushed too hard, this should be fine. However if you *do* have a lot of i/o wait as it stands right now, this is going to push your load average up quite a bit.
As I said, just plan and prepare for it, but you should run this at least once every 6 months to a year.