Manual Lenovo px12-450r - LifeLine 4.1 (page 90 of 167) (English)

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Improving Performance with a Cache Storage Pool

A cache Storage Pool is a pool of solid-state drives designed to increase read and write performance on

your px12-450r Network Storage. You create a cache Storage Pool and then associate a volume on a data

Storage Pool to the cache pool.

You can create only one cache Storage Pool on your px12-450r. You can associate a cache pool

with multiple data storage volumes and allocate specific portions of the cache to each storage

volume.

Creating a Cache Storage Pool

To create a cache Storage Pool, there must be one or more SSD drives installed in your px12-450r that are

not part of an existing Storage Pool.

Typically, you create a cache Storage Pool with one solid-state drive. However, if you want to use

the fastest cache policy (Write-back) with your cache volumes, it is recommended that you create

a cache pool with at least two SSD drives and apply a redundant RAID protection to help prevent

data loss in the event one of the SSDs fails.

1. Open the Drive Management feature and click Add Storage Pool.

2. In the Information section, enter a name for the cache Storage Pool.

3. To set the RAID protection, choose a value from the drop-down menu:

● Parity (RAID 5)

Uses the space corresponding to one drive-size for protection, leaving remaining space for

storing actual data.

● Mirror Stripe (RAID 10)

Uses half of the storage space for protection, leaving half for actual data. Protects cached

write data in the event one SSD fails.

● None (RAID 0)

Uses all of the storage space for data. Does not protect against data loss in the event of drive

failure; however, the SSDs are striped for better performance.

● None

Uses all of the storage space for data, providing contiguous storage space by concatenating

all member drives. Does not protect against data loss in the event of drive failure.

If you plan to use the Write-back policy for any cache volume, the cache pool should use the

same level of drive protection as the data pool to prevent data loss in case of loss of the cache

pool. If you will be using only Write-through or Write-around cache volumes, the cache pool can

be unprotected. See the following section on Assigning a Cache Pool to a Volume for more

information on setting cache policy options.

4. Select the checkbox of the solid-state drive or drives you want to add to the cache pool. You can

only designate SSDs as cache pool drives if they have not already been assigned to an existing

Storage Pool. All drives in a Storage Pool must be the same size.

Storage Pool Management

Improving Performance with a Cache Storage Pool 80

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Lenovo px12-450r - LifeLine 4.1 Manual

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