Ibm ds Storage -- Replace drive option

A lun consists of disk4 of the controller, disk4 of enclosure1, and RAID 5 consisting of three disks in total.

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The figure shows that the controller is normal, and the situation of enclosure 1 is as follows:

Disk4 is failed, assigned

Disk6 is hotspare, inuse

 

Before the Storage manager V10.10, disk4 breaks down and the disk 6 is on top. ARRAY reconstruction is complete. If diskreplace disk4 is changed to a new one, disk6 after reconstruction copies the data to the new disk, this process is called copyback.

After SM V10.10, a function called replace drive option is added. To put it bluntly, the copyback step is omitted because it will affect the system performance.

 

For the above example, you can follow the steps below to replace disk

1) Select the disk to replace. In this example, It is disk4. Select "drive"-"replace drives" in the toolbar"

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2) There are two options.

A. Use unassigned disk, which means replacing the failed disk4 with an unused disk.

B. use In-use hotspare disk. This means that disk6 will replace disk4 as a member of this ARRAY and replace disk4.

Both options avoid copyback operations.

 

3) disk4 will change to the unassigned State and will no longer be a member of ARRAY.

 

Tips:

1. Try not to use the unassigned disk in the same system to replace a failed disk, which may lead to loss of redundant data and configuration errors.

2. If multiple failed disks occur at the same time, they may not necessarily be the disk itself, but may be the FC-loop hard disk on the back panel of the storage system!

This article is from the "star & storage" blog, please be sure to keep this source http://taotao1240.blog.51cto.com/731446/978740