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HP introduces the HP SC11Xe Host Bus Adapter which allows HP customers to archive data at the fastest U320 speeds available on servers using the PCI-Express interface.
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| Technical questions - cache/memory |
| Q1. |
Is Drive Write Cache available on HP SATA drives? |
| A1. |
Yes, however HP ships SATA drives with Drive Write Cache (DWC) disabled. The preset configuration was selected to provide greater safety for our customer's drive data in case of sudden power loss, when there is no battery on the controller to protect the cache.
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| Q2. |
Can Drive Write Cache be enabled on the controller and SATA drives? |
| A2. |
Yes, please see the attached presentation for the latest servers and controllers that allow for Drive Write Cache to be enabled.
WARNING: Enabling DWC may result in loss of data if power is lost to the server and there is no power protection configured for the server. When Drive Write Cache is configured, the following best practices should be used to protect the data in case of power loss: Install a redundant power supply in the server (if available for that server). If redundant power supplies are used and one power supply fails, temporarily disable Drive Write Cache until a replacement power supply has been installed. If redundant power supplies are used, add an additional layer of power protection by connecting each power supply in the server to a separate Uninterruptible Power Supply (UPS). If multiple UPSs are used, add an additional layer of power protection by connecting each UPS to a different AC circuit.
How to Enable Write Cache on SATA HDDs for HP ProLiant ML100 series and ML310DL320 Servers DWC
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