CacheVault Flash Cache
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This article describes the function of the LSI CacheVault Technology. It is a similar technology to Adaptec Zero Maintenance Cache Protection (ZMCP).
How it works
In traditional RAID controllers a BBU (Battery Backup Unit) protects the contents of the cache. The cache contents are retained, because the cache modules are supplied with power from the extra battery in case of a power outage. When the battery is empty, (usually within 72 hours), the contents of the cache will be lost.
No battery is used with CacheVault technology. The cache content is protected by the following systems:
- A double-layer capacitor is connected to the RAID controller.
- This will be fully loaded automatically during server startup.
- In case of power failure the RAID controller uses the power of the capacitor to write the Flash-Memory to maintain all contents of the cache non-volatile (almost like a USB stick).
- The next time the server is started the RAID controller writes the data from the Flash-Memory to the RAID Array.
Some advantages compared to a BBU:
- A traditional BBU loses cached data after 72 hours without restored power. CacheVault technology stores the contents of DRAM on NAND flash for up to three years.
- No BBU/battery replacement necessary
- 3 years of guaranty instead of 1 year for BBUs
Controller with CacheVault
- MegaRAID SAS 9260CV-4i
- MegaRAID SAS 9260CV-8i
- MegaRAID SAS 9285CV-8e
- MegaRAID SAS 9286CV-8e
- MegaRAID SAS 9286CV-8ECC
Controller with optional CacheVault Module
The following controllers are available as options CacheVault Module LSICVM01 (LSI00297).
- MegaRAID SAS 9266-4i
- MegaRAID SAS 9266-8i
- MegaRAID SAS 9271-4i
- MegaRAID SAS 9271-8i
- MegaRAID SAS 9271-8iCC
Video Showing CacheVault
Additional Information
- CacheVault™ Flash Cache Protection (lsi.com)
Related articles
LSI RAID Monitoring Plugin setup
Monitoring MegaRAID Controllers in VMware
Setting the LSI RAID Monitoring Plugin on a 2012 Windows Server