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MySQL disk Io%util high RAID card BBU learn cycle period

greatly improves RAID card write performance, which in most cases reduces the system IO load. The reliability of the data is guaranteed by the raid card's BBU (Battery Backup Unit). Writethrough: Data writes do not use caching and data is written directly to disk. RAID Card write performance is degraded, and in most cases this setting causes system IO load to rise. Cache policy for Megasas RAID ca

Analyze Dell Server RAID card BBU discharge status from monitoring data

; From the above monitoring diagram can see the BBU at 9 points when the battery capacity is rising, up to the maximum, just 10:06 minutes, that is, leam_cycle into the first stage of time, from this buu discharge rule, the entire process to enter the BBU discharge is 4 hours to complete To get the second message, the BBU

Q & A on raid and bbu

) write back?1. The existence of bbu is a necessary condition for using writeback;2. Write-back is the default write policy;3. After the raid array and ibbu are deployed, ibbu completes learn cycle at least six hours during its first use.4. One learn cycle includes two parts:A) Learn cycle discharge cycle: approximately three hoursB) Learn cycle charge cycle: approximately four hours Q3: after the power is fully charged, write back is also in normal u

Optimized Battery Life for Android devices-(1) monitor Battery and Battery charging

When you want to reduce the update frequency of the background Update Service to reduce the impact of programs on the battery, checking the current battery power and charging status is a good start point. The impact of program update on the battery depends on the current battery power and charging status. For example,

What is a new lithium battery? What is a polymer battery?

The new lithium battery (polymer battery) is short for Polymer lithium-ion battery and one of the types of lithium-ion battery. To understand what a new lithium battery is, in addition to providing the definition of the new lithium batte

How long is the battery life of the Apple phone? How to calculate iphone battery life

How long is the battery life of the Apple phone First, battery life: According to official parameters, in IPhone5, for example, full charge (20% charge to 100%) 400 times after the battery performance will be reduced by 80%, each year with 20% performance decline. The iphone battery life theory time is about 2-3

What is the difference between lithium battery and Ni-CD battery?

The main differences are seven points:1, the composition of the material is different: lithium batteries with carbon materials (graphite) as the cathode, lithium-containing compounds as the positive electrode, nickel-cadmium battery cathode from the nickel oxide powder and graphite powder and other active substances, the anode is composed of cadmium oxide powder and the active substance of iron oxide powder. 2, the working principle is different: the

Android battery (5): Analysis of the battery charging IC (pm2301) Driver

Keywords: Android battery meter pl2301 task initialization macro Power_Supply interrupt thread Platform information:Kernel: linux2.6/linux3.0System: Android/android4.0Platform: Samsung exynos 4210, exynos 4412, and exynos 5250 Author: xubin341719 (You are welcome to reprint it. Please note the author) Correct the mistakes and learn and make progress together !! Download the complete driver code and specifications: max17040_pl2301 Android

Does the laptop battery continue to affect the battery?

When there is AC power will not use the battery, only in the AC disconnect when the battery is enabled, power off when the battery can protect the computer, battery life is a little shorter, but negligible. When in use, the plug on the book do not frequently pull plug, to keep the wear interface. Especially in the case

Computer battery icon has a red fork, hint: please consider replacing the battery how to do?

Recently, a netizen asked: The computer's battery icon has a red fork, click on the battery icon, will show: please consider replacing the battery. However, the integration of computer batteries, this should do? Small make up the official suggestion is to take the machine to find after the sale, if you do not want to sell, you can also choose to update some of th

Battery safety is better than lithium battery.

How long does it charge?In the case of 20-40 ℃, the Super battery is charged at a time of 3-5 minutes, and under 40-60 ℃ high temperature conditions, the charge is only 6-10 minutes. When the battery is used on the petrol-hybrid bus, every time the car brakes, the super-battery can recover energy, the vehicle again after the activation, and then push the energy o

IPhone6 Plus how to replace the battery iPhone6 plus change the battery graphics and text tutorial

PS IPhone6 Plus Battery has a point is the tool to professional, such as screw tools than our household are only professional to open the phone, and the inside of the power cord and the motherboard is glued to the operation of everyone do not force too fiercely. Step 1th: Get the following tools and parts--iphone6 batteries and iphone repair kits. Need to buy a new battery, a dedicated screwdriver, a pry p

Android battery changes and android battery changes

Android battery changes and android battery changes Problem:1. Power jump to 50%2. Battery ID pin grounding3. temperature pin to determine whether the battery is in place Speculative reason:How to determine the battery position: qpnp-linear-charger.cenum bpd_type{  BPD_TYPE_

How can I change the battery of iPhone 4? IPhone 4 cell phone battery replacement tutorial

"How to replace the iphone battery _iphone battery Replacement Method" 1, as shown in the following figure we have two screws in the back of the Apple 4, we just need to use professional Qi to twist it off. 2, after lifting the screws, you need to push up the rear cover as shown. This process needs to be very careful, otherwise the glass shell is likely to be damaged: 3, okay, now we can get the

How to make a battery charge in Android: a progress bar for scrolling up and down the picture (battery)

Recently, the creation of an app, the need to simulate a battery of the progress bar, based on the amount of electricity to set a percentage, the progress bar constantly rolling up and down, like the usual mobile phone charging the same battery progress bar. I implemented the power progress bar on my custom view. Modify the picture to achieve the desired effect First, the custom View,battery.java, the circ

Win8.1 calibration Battery How to do? Win8.1 Calibration of battery method

Note: We must have our battery fully charged before verifying the battery.1. Then we boot the notebook, and then when the logo icon appears, press the "F2" as shown in the following figure.2. This goes to the BIOS management interface of the notebook. Let's see the details. Start the checksum now. 1. Entering the BIOS interface, we click on the "Advanced" button.2. Then we find the "Smart

How can I change the Samsung S4 Zoom Battery? Samsung S4 Zoom for battery tutorial

1. Shut down the S4 Zoom mobile phone (long press the power to shut down), and then buckle the device side cover as shown in the figure.2. After opening, we will see a slide in the specified [OPEN] direction.3. Now we only need to place the metal side of the battery on the left side of the device and insert it into the device, as shown in the figure.4. Then, we held down the archive by hand, and then moved to the CLOSE direction.5. Close the side cove

What should I do if my laptop battery is charging?

Notebook battery Charging dissatisfaction How to do, many children's shoes are always asked small, in fact, laptop batteries need personal maintenance. If you want your battery to be fully charged, you should set the Power management mode to "Maximum battery life". Here's how: Start Control Panel, find the "power" option, double-click open (as shown in Figure

Does Samsung Galaxy S6 support battery taking? Can the S6 battery be removed?

Galaxy S6 is a built-in battery and does not support its own disassembly. If you need to remove or replace batteries, please contact the Samsung Service Center or authorized maintenance agency. The damage or error caused by the movement of the battery by the unauthorized agency is not within three packs. Of course, if the warranty period we can find repair mobile phone friends to help us dismantle

IPhone6 Plus battery How to maintain? iPhone6 Plus battery tips (1/2)

Believing that the phone's endurance problem is one of the biggest headaches for all smartphone users, the problem is not well addressed, only improved. For the recently concluded IPhone6 new product launch, we are on the launch of another mobile phone is very interested, there have been many people consulting iPhone6 plus battery How to maintain the next small series to teach you how to do.    How to maintain the IPhone6 plus

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