Pinning a Volume Created with a Previous Release
When trying to pin an existing volume that was created before version 2.1, the volume will not be pinned. This is because the current array caching technology is not compatible with volumes created before Version 2.1.
To successfully pin a volume that was created before array OS version 2.1, you must upgrade the array to 2.1 or higher, and wait for the cache to age out. As the cache ages out under the new array OS, it is rebuilt with the latest caching technology. Once the cache ages out completely, you can safely pin the volume. A two-month cache aging period is generally sufficient. However, if you want to obtain the exact cache aging period for your volume, contact support.