A fault-tolerant storage system that
meets industry standards
If you need a faster, bigger storage solution, the CR8e RAID subsystem from
nStor (formerly Conner Storage Systems) might be for you. The CR8e has
eight SCSI-3, hot-swappable hard disk bays. It accepts either 4.2GB or 9.1GB
hard disks, giving you a total of 72GB of online storage or a total of 63GB of
online storage using RAID 5. (The system supports RAID levels 0, 1, 3, 5, 0+1,
30, and 50.) You can chain multiple units together to get a total of 1TB of
online storage. CR8e supports 1" or 1.625" 7200 or 10,000 RPM hard
disks.
You can further increase CR8e's capacity by reconfiguring and upgrading the
system. For example, you can configure the system for dual-bus operation (each
bus has four drives) or you can configure it to be a fault-tolerant boot device.
In other words, you can use CR8e to boot your system--something you can't
ordinarily do with Windows NT. The CR8e uses field upgradeable interface cards
to extend the Ultra SCSI signal or to support a variety of host environments.
Current interface cards include the Ultra Extended and Differential Converter
cards. The unit supports fibre channel and low voltage differential SCSI (LVDS)
technologies.
The CR8e is cluster-ready and is a Wolfpack-compliant RAID system.
(For more information about clustering solutions, see "Clustering Solutions
for Windows NT," June 1997.) You can use either dual PCI controllers or a
multihost embedded interface controller for clustering.
CR8e also complies with the SCSI Accessed Fault-Tolerant Enclosure (SAF-TE)
specification. Most server and RAID controller manufacturers endorse this
specification, which nStor and Intel developed. The SAF-TE standard
provides a standardized method for monitoring the temperature, disk drive, power
supply, and cooling fan status and communicating this information over the SCSI
bus to the host system. The AdminiStor Management Software uses the Simple
Network Management Protocol (SNMP) to monitor and manage SAF-TE compliant
products.
The CR8e system I reviewed came with the American Megatrends' MegaRAID PCI
controller. The controller supports the SAF-TE standard. The controller also
supports on-the-fly drive expansion and dynamic RAID level migration so that you
can add hard disks and change the underlying RAID fault tolerance while the
system is running. MegaRAID comes with 4MB of cache memory, which you can
configure for write through or write back operation. You can upgrade the cache
memory to 128MB. The controller uses an Intel i960 processor running at 33MHz.
Although the MegaRAID is a dual-channel SCSI controller, you can purchase it
with three SCSI channels if you need more drives or extra bandwidth.