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Questions tagged [bbu]

10 questions
14
votes
7 answers

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 its data for up to 72h. I'd expect the data to be…
tanascius
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3
votes
3 answers

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 server is not used to capacity (by far), the results…
Wikser
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2
votes
4 answers

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 power failure, t should allowed plenty of time for…
user175615
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1
vote
1 answer

Does the RAID BBU battery charge while server is powered off?

The title says it all. I am trying to troubleshoot a problem with the battery in a BBU RAID cache. During POST, an error is given something to the effect that the battery is low, the RAID cache is temporarily disabled and will begin working once…
B00TK1D
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1
vote
2 answers

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 I would like to move the array to older 3ware…
Scyld de Fraud
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1
vote
3 answers

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? Intel Cherry 520 SSD x 4 RAID 10 LSI-9260 with…
user3180
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1
vote
3 answers

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 write-through) I realized the BBU was not charged.…
mattsn0w
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0
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1 answer

LSI iBBU07 troubleshoot: BBU not detected?

I have bought a used LSI iBBU07 for my LSI 3ware SAS 9750-8i RAID card. And now the card cannot detect the BBU even though I have seemingly installed it correctly. I would like to know that: Is there any hope to troubleshoot this BBU? The BBU came…
Maxthon Chan
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0
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2 answers

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 a little over 2 weeks "BBU disabled" started…
Erwin Blonk
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0
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2 answers

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 many and what type of disks my server has? Thanks
Continuation
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