Pool and disk group
In this part of the tutorial on MSA arrays, we will see how to configure storage.
A pool consists of one or more groups of disks. MSA arrays support two storage pools A and B.
A disk group is a physical disk set that has a type of: Virtual or Read Cache.
- The virtual type groups physical disks in a RAID 1/5/6/10 array and must consist of disks of the same capacity and speed (SSD / 7.2 / 10/15).
- The Read Cache type consists of one or more SSDs. This group has the role of increasing the speed of reading data.
Before you can create a drive cache type disk group, you must define a storage group.
The access to the creation of a storage pool and to the disk group is done by the menu on the left Pools 1, click on the button Action 2 then Add disk Group 3.
Disk group: storage
1. Select the type Virtual, choose the desired level of raid then check the disks to put in the group. Select pool A 1 and click on Add 2.
A disk was not included in the group because it will be defined as a spare.
A disk group consists of disk of the same speed and capacity.
2. The disk group is visible in the pools page. We see that the pool A 1 was created, that this one contains the group of disk dgA01 2 and that it is composed of the disks 1.3 to 1.14 3.
Disk group: cache
1. Access the Add Group Group form.
2. Select the type Read Cache 1, check the SSD 2 to put in it. Check pool 3 and press Add 4.
A read cache disk group consists of one or more solid state drives.
3. On the pools page you should see disk group 1 and its physical disk composition.
Define a spare disk
1. Go to System 1 and click on Action 2 and Change Global Spare 3.
2. Check the disk (s) 1 to spare and click on Change 2.
3. From the System page, by hovering over the disc, it is possible to see the use 1 provided for it.
Summary of the configuration
You can access a summary of the configuration of disks and storage pools in two places:
1. From the System 1 > Table 2 part, we can see the state of each disk 3 with its allocation pool and its function.
2. From the home page, you can see the two storage pools with the size of the affected disk groups.
A volume is a virtual disk created on a storage pool that is presented to a server as storage.
Add a volume
1. Go to the Volumes 1 section and click on Action 2 and Create Virtual Volumes 3.
2. Enter the volume capabilities and click OK 1.
You can create multiple volumes at once by clicking Add Row.
3. Volume 1 is now visible in the list.