Bedienungsanleitung Lenovo px12-450r - LifeLine 4.1 (Seite 91 von 167) (Englisch)

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5. Check Enable periodic consistency check to enable a monthly parity or mirror consistency

check.

The check helps to prevent a single drive failure from becoming a two-drive failure. The check

runs for several hours and can affect performance of the px12-450r. If you do not want to run the

check on your cache pool, remove the check mark for this option.

6. Check Use for SSD Cache.

7. Click Create to add the cache Storage Pool.

8. Click Cancel to discard any changes.

Assigning a Cache Pool to a Volume

After creating a cache Storage Pool, you assign a volume from a data Storage Pool to use a specified

portion of the cache pool. A cache pool can be assigned to a new or existing volume. You can also assign

multiple storage volumes to use the cache pool by managing the cache size for each volume.

1. On the Drive Management page, begin creating a volume or expand an existing volume in a data

Storage Pool.

2. In the information section for the volume, check Use cache for this volume.

3. Enter a value for the Cache Size (GB) to specify the amount of cache space for the volume. This

value cannot exceed the total size of the cache pool.

4. Select the Cache Policy to use with this volume.

● Write-through - This is the safest cache policy. All writes are cached to the SSD pool and are

also written to disk immediately. Write-through caches are not persistent through a drive

removal or device reboot. All disk reads are cached.

If your SSDs have slower write performance than your non-SSD drives, this policy may limit

write performance; however, this is likely only when using early generation SSDs. You can

avoid this issue by using only SSDs qualified for use with your px12-450r. Refer to

http://support.lenovoemc.com for a list of approved SSDs.

● Write-back - This is the fastest cache policy, but is less safe. All writes go to the cache pool

initially and then are written to disk later. Data loss can occur if the cache pool is lost before

disk write is completed (for example, if an SSD fails on an unprotected cache pool). Write-

back caches are persistent across drive removal or device reboot. All disk reads are cached.

● Write-around - This is a safe policy that improves read performance, but not write

performance. Writes are not written to the cache pool. They are written to directly to disk.

Write-around caches are not persistent across drive removal or device reboot. All disk reads

are cached.

5. Click Apply to save your settings for an existing volume, or click Create to create a new storage

volume.

It is possible to create user data volumes or iSCSI drives in an SSD cache pool; however, this

can affect the performance of the cache pool and is not recommended.

Storage Pool Management

81 Improving Performance with a Cache Storage Pool

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