Several common problems of ibm ds storage (1)

Let's talk about several common problems of DS series storage today,

1, Multiple Drive failed

This problem should be the biggest headache for all administrators. Once multiple disks break down, the application system will not be able to access the storage, and all applications will have to be stopped. Then, the IT Director was asked by his superiors, and he had to call and ask for help. A lot of cases of disk failure are due to poor inspection at ordinary times and irregular health check. Some disks have been broken for two or three months, and the O & M has not been found yet. When the second disk breaks down, if the application cannot be accessed, use RAID5 as an example.

In this case, if you are in maintenance period, you should protect the site and immediately call 800 for support. Do not unplugging the disk. Maybe you will make things more complicated. In some cases, the failure of multiple disks can be recovered. The following uses RAID 5 as an example ). Some people may wonder, isn't RAID 5 the best way to break a disk? Yes, RAID5 can only break down one disk in any case, but this means physical damage, but some hard disks may be failure, or logical failure. For example, if a hard disk has been damaged, the hot backup disk is in the top, and the system is in reconstruct. At this time, the application is still writing data. If the load is large, a hard disk logical failure may occur. In this case, the array is fail. In this case, the data can be recovered.

2, FailOver

Under what circumstances will I fail? In fact, many people do not want to use failover, because only some components have problems, such as the host's HbA card, the switch and network between the host and the storage, A failover occurs only when a controller is faulty. This is a bit like buying insurance, just in case, but everyone does not want to use it in insurance companies. Once it is used, it means you are in trouble.

Generally, the multi-path architecture is like the left, the host has two HbA cards, two FC/Network switches, and dual-control. In this way, any component in the middle has a problem and does not affect host access to storage. As shown in the following figure, it is a physical diagram and the logic diagram 650) this. width = 650; "style =" background-image: none; border-right-0px; padding-left: 0px; float: left; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-right: 0px; padding-top: 0px; "title =" image "border =" 0 "alt =" image "align =" left "src =" http://www.bkjia.com/uploads/allimg/131228/0235405553-0.png "width =" 553 "height =" 484 "/>

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Tips: conduct regular fire drills. For example, when the application load is small, switch one lun accessed by each host from one controller to another, and then observe whether the application has paused, if the switch fails, it indicates that a component in the middle has a problem. You can troubleshoot the component one by one. If you cannot troubleshoot the problem yourself, call 800.

For Failover Mode, which involves ADT/AVTAutomatic Logical drive Transfer), aluaasypolicric Logical Unit Access), you will have time to write a Blog.

3. LED light

The ancients in China looked at people's health from the perspective of their faces and pulse. Similarly, the storage system can also be used. Many problems can be seen from the LED. I don't know where the LED light is? To https://www-947.ibm.com/account/userservices/jsp/login.jsp? PersistPage = true & page =/support/entry/myportal/& PD-REFERER = none & error = download Hardware and Maintenance Guide, which is generally in Chapter 4. operating the storage subsystem.

1, Drive LED, this is very simple, once the amber light, it indicates that the disk is broken, it should be replaced in time.

2. Controller/ESM 7-Segment Display LED. This generally displays the Enclosure ID. The default value is "85". You can also modify it by yourself. If other numbers or letters appear, the Controller may be faulty. If it is "OS + SD", it indicates that the controller is in the boot process. If you are interested in other LEDs, go to the Hardware and Maintenance Guide of the corresponding product.

3. Drive channel and Host channel LED. This not only shows whether the Drive channel is faulty, but also shows Link speed. For example:

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Go to the Hardware and Maintenance Guide for details.

4. Service Attention LED. If the amber light is displayed, it indicates that the Storage system is faulty. You need to enable Storage Manager to check for any problems.

I will write this article today, and I will try again later if there are other problems.

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