topic Re: EVA 8000 - Cache Battery functionality in HPE EVA Storage

EVA 8000 - Cache Battery functionality

ischurek — Sat, 04 Apr 2009 03:00:10 GMT

Hello,

I am looking for HP documents describing in EVA 8000 how the Cache Battery fault-tolerant is implemented. Being more specific, in each controller there are 2 cache Batteries, what is the correlation between those two, what happen if one is dead – does the Array controller enters “secure mode”, Cached disabled mode? Or we remain in full functionality, even if one Battery on 1 Controller is dead.

Thanks,
IS

Re: EVA 8000 - Cache Battery functionality

IBaltay — Sat, 04 Apr 2009 04:36:38 GMT

Hi,
the cache policies/rules are the following:
1. if the system battery on any controller is bad and
a)if the system battery on the second controller is bad too, there is no data disk presentation
b)if the second controller system battery low, all disks writethrough on the second controller
c)if the second controller system battery good, all disks writeback on the second controller

2. if the system battery on any controller is low and if the second controller system battery good, all disks writeback on the second controller.

3.
a) if both controller system battery low, all disks writethrough on both controllers

b) if both controller system battery good, all disks writeback on both controllers

Re: EVA 8000 - Cache Battery functionality

ischurek — Sat, 04 Apr 2009 05:26:27 GMT

Sounds good. Thanks.
Could you please point to HP documents which describe this Policy?

Thanks
IS

Re: EVA 8000 - Cache Battery functionality

IBaltay — Sat, 04 Apr 2009 06:47:44 GMT

Manuals should be accessible here:

https://ovrd.external.hp.com/rd/sign-in?TYPE=33554433&REALMOID=06-000dbac2-dc02-1680-9aa0-a14d91440000&GUID=1&SMAUTHREASON=0&METHOD=GET&SMAGENTNAME=$SM$i%2bVqGd4Zrg0nzFPTAbCG%2fQrn0f2UZowYfT2RitHvQEb1t1qlFq3Rt65IHxgfcRnD&TARGET=$SM$http%3a%2f%2fsupport.openview.hp.com%2fselfsolve%2fmanuals

after the registration

it is in the EVA 4/6/8 service manual in the table 46, effect of battery state on cache policy, p. 134...

Re: EVA 8000 - Cache Battery functionality

ischurek — Sat, 04 Apr 2009 08:01:55 GMT

Could not find it. Could you be more specific?

IS

Re: EVA 8000 - Cache Battery functionality

IBaltay — Sat, 04 Apr 2009 08:55:36 GMT

here is the screenshot...