Poor Transfer Rate on backing up large volumes with repository on Dell PERC H710 Mini and H800 RAID Adapters (4040156)

Check the Adapters to see if the following options are set:



Read policy: Adaptive Read Ahead - The RAID controller automatically adjusts the read policy based on the current pattern of read requests.

Write policy: Write back - This mode provides better performance in most cases. In Write‐Back mode, the RAID controller acknowledges write I/O requests immediately after the data loads into the controller cache. The application can continue working without waiting for the data to be physically written to the hard drives. If a power loss occurs in write‐back mode, there is a risk of losing data in the RAID cache. The data loss may be fatal and may require restoring data from a backup device. It is critical to have protection against power failures. Using a UPS with redundant system power supplies is highly recommended. RAID Backup Battery Unit can provide additional protection - this is recommended setting but only if UPS and RAID controller battery are present on the Core server.

Disk cache policy: it is recommended to have it disabled, but with the UPS and RAID controller battery present you may opt to enable it.