Writes are also automatically flushed to disk in event of a power failure. The battery-protected write cache is mirrored between the two controllers to protect the writes in the event of a controller failure. Regardless of the RAID level or drive type, all writes are cached, the write acknowledgement sent to the server and the data aggregated for efficient writing to disk. A single storage system that concurrently supports multiple RAID levels and different drive types allows the investment to be maximized, as well as simplifying the management of the storage environment. Whereas for backup applications or web pages that are static nature and can be viewed but not altered, the storage system must perform well in a sequential and caching modes. This enables the storage array to be tailored to meet multiple application and budget requirements.įor example, applications where the data is constantly being read and updated such as a CRM systems, online transactional databases, and applications such as payroll and HR, the storage needs to perform well for random small block writes. These drives are also offered as SED (self-encrypting drives). Supported drive types are 7,200 rpm SAS hard disks and 1WPD TLC Solid State Disks (SSD) as well as QLC SSD for highly affordable solid state performance. Also, different drive types can be intermixed within a system. ![]() The traditional RAID levels of 0, 1, 1+0, 4, 5 and 6 are supported, as well as the Nexsan unique levels Accelerated RAID 5S and 6S where parity is stored on dedicated SSD(s) to improve random write IOP performance. The Nexsan E-Series and BEAST enterprise class storage systems are capable of being configured with multiple simultaneous RAID levels.
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