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20
votes
7answers
1k views

Am I damaging my battery by never using it?

I have a MacBook Pro that stays plugged in for weeks or months at a time. Am I damaging my battery by not using it? I know you should cycle it monthly to recalibrate it...is that good enough? Should ...
13
votes
1answer
4k views

Hardware RAID controller cache battery failure frequency/lifetime?

I'm in an environment that contains many Supermicro servers equipped with Adaptec and LSI MegaRAID hardware RAID controllers. These controllers contain battery-backed cache modules to help boost write ...
12
votes
12answers
26k views

What is the lifespan of an typical UPS battery?

When using a uninterruptible power supply how long does it preserve the original capacity? Say I buy a UPS that holds the necessary load for 10 minutes - I don't want it to unexpectedly come into ...
9
votes
4answers
28k views

How to recover the strength of a laptop battery?

I got a laptop, which I brought a year ago, which has a battery that can last for 3 hours. 6 months ago, the battery's life dropped down to roughly 15 minutes (Windows says its supposed to last for ...
6
votes
9answers
2k views

Off-brand laptop batteries?

I tend to err on the side of paying too much for quality stuff, but $180 for a standard replacement battery for a Dell laptop makes the $80 knockoffs look pretty tempting. I wouldn't consider it ...
6
votes
3answers
5k views

What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?

Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power ...
5
votes
3answers
11k views

Dell Perc 5/i battery replacement - how long until it registers as good?

So I replaced the battery for my Dell Perc 5/i controller since the machine had an error code that it needed to be replaced. I ordered the battery directly from dell based on the service code and ...
5
votes
1answer
9k views

Smart Array P400 - Accelerator Replacement Battery Failure

TL;DR - Is the immediate failure of a replacement battery, for a failed battery, on a battery backed accelerator for a Smart Array P400 controller a common occurrence? Or are we likely to have an ...
4
votes
2answers
5k views

Change the UPS battery while it's powered on?

Is it dangerous or not advisable to change the UPS battery while it is plugged in? We have an APC Smart-UPS 1500 and we need to replace its battery. I have the new battery but the UPS powers a few ...
4
votes
3answers
388 views

Considerations when buying a UPS Replacement Battery

According to a couple of my Smart UPS 3000s (Model DLA3000RM2U), it is time to replace the battery. Other than making sure I get the right battery for the particular model, are there any other things ...
3
votes
4answers
7k views

Dell Perc 6/i Raid Controller Battery Missing

I noticed when I installed the Dell OpenManage that the battery on my Raid controller is missing. Is this something that is critical? What does the battery do?
3
votes
3answers
235 views

Buying a Refurbished UPS?

I have a 10 year old APC Smart-UPS XL with battery pack, and need new batteries. Looks like I'll be spending $500-700 in batteries. While shopping around, I noticed a few places selling refurbished ...
2
votes
2answers
3k views

Non-volatile cache RAID controllers: what kind of protection is there against NVCACHE failure?

The battery back-up (BBU) model: admin enables write-back cache with BBU writes are cached to the RAID controller's RAM (major performance benefit) the battery saves uncommitted and cached data in ...
2
votes
4answers
177 views

Data consistency with RAID 5 and BBWC

I have a few questions about RAID 5, BBWC (Battery Backed Write Cache), filesystem (ext3) and optionally mysql. I have a hypothesis and I ask Server Fault community to validate or not this one: -The ...
2
votes
3answers
803 views

How can I tell if my hard drive(s) have Battery Backed Write Cache?

How can I tell if my hard drives have a battery backed write cache (BBWC)? How can I tell if it is enabled and/or configured correctly? I don't have physical access to my server. It's a GNU/Linux ...
2
votes
1answer
37 views

After UPS battery replacement (HP R/T 3000)

has any one had experience with this UPS? i have replaced the batteries but have't ran self test yet, if i run self test is there a risk of powering down the machines the UPS powers? just wondering ...
1
vote
5answers
8k views

Dell PowerEdge 1950 RAID Battery - what kind?

What kind of battery do I need for a Dell PowerEdge 1950 RAID? I am seeing an error code W1228 on the front which means <24 hours for the RAID battery. Per the Dell manual it says I need to ...
1
vote
1answer
139 views

UPS Batteries different capacity

I'm trying to get a replacement battery for a Cyberpower UPS model CP425HG. The original battery is 12v, 3.6Ah. However, there are not identical batteries in my area, only 12v, 1.2 amp hour batteries ...
1
vote
3answers
297 views

how do I properly measure capacity of a UPS battery?

How can I properly measure the capacity of a UPS battery? Unplugging it from the wall is a bad idea since it loses the ground, so how can this be done?
1
vote
2answers
3k views

HP Smart Array P400/256MB SAS Controller BATTERY

This is probably a dumb question. I recently purchased a couple of refurbished HP SB40C storage blade for our HP Bladesystem c3000 enclosure. Each comes with an HP Smart Array P400/256MB SAS ...
1
vote
4answers
763 views

Is there a way to find out a computer's BIOS password for the Hard drive? [closed]

I have a computer that a password appeared for the Hard drive, I have a Toshiba Satellite Pro, Model No. M15-S405. I called customer service and they want me to drive 200 miles so they can flash the ...
1
vote
0answers
420 views

apcupsd not working properly on centos 5

I have APC UPS and my servers are directly connected to it using power cable. I want to use network link to shutdown servers when ups goes on batter. the following is my config file. ## apcupsd.conf ...
1
vote
2answers
1k views

Gracefully Shutdown an Equalogic SAN

Like many others I have jumped on the VMware bandwagon. We are hosting all of our data on an Equalogic SAN and need a "gracefull" way to shut down the VMs and the SAN if the battery backups reach a ...
0
votes
2answers
95 views

ups to give few minutes for about 20 PCs and 10 Printers

We've a problem in the electricity current for three months right now, I was tasked to get the best solution, and it should be cost effective also, for allowing our application users to save and ...
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 ...
0
votes
1answer
291 views

LSI 2208 9286-8e MegaRAID controller beeping when connected to 24-bay NexentaSTOR JBOD enclosure

I am getting beeping from the LSI external RAID controller even if I properly shutdown and there is no array re-initialization. Would I be required to use a battery back (BBU) with the LSI controller ...
0
votes
2answers
55 views

Optimise httpd/mysql for battery life

this is a bit of a weird one. Basically, I'm going to be on a 12 hour flight soon, and I'd like to know if I could tune Apache2 and MySQL 5.1 to use less CPU/RAM and thus less energy so I can ...
0
votes
2answers
124 views

Battery backup for Workstation & Printer

I have been tasked with finding a price for a battery backup solution for our printers. Each printer is listed at 240v 24a <5.5kW and each workstation is using a 500w power supply. We are ...
0
votes
1answer
102 views

Is there a software solution to plug off the laptop? [closed]

Is it possible to plug off the laptop by a command from the laptop, rather than by removing the adapter from power source? I am on Windows Seven, but I will also welcome any note regarding the ...
-1
votes
1answer
169 views

How to replace NVRAM battery in BlueArc storage?

The RAID/NVRAM battery on a BlueArc Mercury storage host is located in the front of the storage head, and can be replaced without down time. From what I can gather, after battery change, I have to ...
-1
votes
1answer
618 views

Could the Input/Output or some other difference between adapters/chargers cause this? [closed]

I have a laptop and my adapter/charger could not be used anymore as the cable was cut. So I bought a new adapter but it was slightly different than the original. My original had (Toshiba's original): ...
-2
votes
2answers
88 views

Running long time off a battery [closed]

I don't know if this question is suitable for ServerFault, but here it's anyway. I brought what's called power-inverter connected it to a battery charger to test how many amps my computer uses, so I ...
-2
votes
2answers
114 views

server offline for battery swap? [closed]

I'm a HostGator customer, and they frequently post notices that such-and-such server will be momentarily offline for a "battery swap". What exactly are they swapping? I assume it can't be the CMOS ...