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2answers
254 views

Move raid10 from LSI 9750-8i to 3ware 9650SE-8LPML

This is a little risky task I want to try. I have a 4 SATA III disks RAID10 array running on LSI (former 3ware) 9750-8i controller with BBU (read and write cache enabled). In case of hardware failure ...
1
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3answers
235 views

RAID10 Without BBU, With UPS

My datacenter says that each rack has primary and backup power on each rack. I assume this means there is a UPS for each server. Therefore, do I have any need of getting a BBU for the following setup? ...
1
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4answers
190 views

RAID Battery and UPS

I have a server with a UPS, life on battery is around 20-30mins, the server has a 2405/128MB without BBU, I am just confused as to do I really need a BBU card? Surely if the UPS is working, during a ...
0
votes
2answers
4k views

Increasing occurrence of “BBU disabled” messages

Until recent my Intel RAID controller (SROMBSASMR) had a monthly occurrence of "BBU disabled: changing WB logical drives to WT", followed about 2 1/2 hours later by "Battery relearn complete". Since ...
1
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3answers
2k views

Dell H700 Controller, BBU present but not charging…?

I have a new Dell R710 with a H700+BBU controller that is not charging. Last week when I was looking at performance stats (and trying to figure out why write policy had changed from write-back to ...
0
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2answers
200 views

CentOS: How to tell if a server has BBU turned on? How many disks?

I got a new VPS. It's running CentOS 5.5. The hosting company said some VPS nodes have RAID BBU while some don't. How do I tell whether my VPS node has BBU or not? Also is there a way to tell how ...
3
votes
3answers
945 views

Benefits of a RAID BBU in addition to a double UPS + PS system

Today I roughly measured the benefits of enabling write-back on the RAID controller on a server at work. It got no RAID battery-backup-unit (BBU) so the write-cache is currently disabled. As the ...
10
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7answers
26k views

What is a (raid-controller-) BBU for?

I am wondering what's the purpose of a BBU. My first understanding was, that it enables the cache to write the data to the disc during a power failure. But some specifications say that a BBU can hold ...