大雪 路滑

uuhs_hiei

今天济南下了罕见的大雪，下了快20小时了仍没一点停的迹象。一点不像老舍描写的那么含蓄，大雪压弯压断了不少树木。
下面分析回顾一下上周的NAS故障，今天先说说直接导致本次故障的错误日志，如下。不能不说IBM的文档给的的不全面
DetailsStorage Subsystem: fastt700
Battery canister
Enclosure: Controller enclosure
Battery Canister Nearing Expiration
What Caused the Problem?
The batteries in the battery canister are nearing their expiration date. The Recovery Guru Details area provides specific information you will need as you follow the recovery steps.

Caution
Do not perform these recovery steps if you have just turned on the storage subsystem or replaced a controller. During these two situations, the battery's self-test diagnostics take approximately 12 to 15 minutes to complete (depending on the controller type and whether the batteries were discharged). Until the diagnostic test is completed, you may see a Recovery Guru failure for batteries that are operational and fully charged.

Caution
Electrostatic charges can damage sensitive components. Use a grounding wrist strap or other anti-static precautions before removing or handling components.
Important Notes

• The purpose of the batteries is to preserve cache data in the event of a power failure. Therefore, you should replace the battery canister as soon as possible. When the batteries reach their expiration date, write caching is automatically suspended until the battery canister is replaced and the batteries are fully charged.
  
• The battery canister replacement procedure varies depending on the type of storage subsystem you have. The following steps provide common battery replacement procedures. Consult the appropriate hardware manual if you need details on locating and replacing the canister.
  
• A battery nearing expiration status may occur if you do not reset the battery age when you replaced the battery. See step 5 below for instructions on how to reset the battery age.

Recovery Steps
1

Caution
If you remove a battery while it is in a Battery Near Expiration state and write caching is enabled on a logical drive, you risk the chance of losing cached data if power to the storage subsystem fails. If power fails before the storage subsystem can detect the removed battery and write all cached data to the disks, you will lose cached data. Typically, it takes approximately 2 minutes to write all cached data (with a maximum of 10 minutes).
You have the following options:

Replace the battery now and assume the risk of losing cached data as outlined in the caution.
Wait until the battery fails before you replace the battery canister.
Ensure that write cached data is preserved before replacing the battery by disabling Write Caching for all logical drives in the storage subsystem.

If...
Then...
You wish to ensure that no write cache will be lost in the event of a power failure
Perform the following steps using the Subsystem Management Window for each logical drive in the storage subsystem:
a
Highlight the logical drive.
b
Select Logical Drive>>Change>>Cache Settings .
c
Record the current status of the Enable Write Caching checkbox.
d
Un-check the Enable Write Caching checkbox if it is selected.
e
Go to Step 2.
You wish to assume the risk of losing cache data
Go to Step 2.
2

Caution
On some models, the battery canister can weigh up to 24 pounds (10.8 kilograms). Use both hands to remove and replace the canister.
Remove the battery canister.
3
Insert the new canister securely into place.
4
Record the installation date (today's date) and the new replacement date (according to the battery's warranty) on the battery canister label.
5
Select the Components button

on the controller enclosure in the Physical View of the Subsystem Management Window. Then, set the battery age to zero by selecting the Reset button.
6
If...
Then...
You disabled write caching in Step 1
Use the information you recorded in Step1 to enable write caching on all logical drives that had it previously enabled using the following steps:
a
Highlight the logical drive.
b
Select Logical Drive>>Change>>Cache Settings .
c
Select the Enable Write Caching checkbox.
Go to Step 7.
You did not disable write caching in Step 1
Go to Step 7.
7
Wait approximately 12 to 15 minutes for the battery to recharge. Then, select Recheck to rerun the Recovery Guru to ensure that the failure has been fixed.


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/1110/showart_6498.html