Texas Memory Systems RamSan-500 - Manual (Page 41)

RamSan-500 User’s Manual 41 of 48
5.3 Flash Modules
The RamSan-500 comes with 9 Flash modules in a RAID 5 configuration.
This section will go over various failure conditions and what must be done
to correct them.
The Flash modules in the RamSan-500 are designed and manufactured by
Texas Memory Systems. They incorporate proprietary technology to
interface with the RamSan backplane and cannot by used outside of the
RamSan-500. Internal to the modules, multiple proprietary error
corrections technologies are used to make a single module extremely
robust and capable of smoothly handling multiple failures of the internal
Flash media. With this technology a module should last at least 3 years,
even under a continuous write load. If the IO load is a mix of reads and
writes Flash modules can last even longer.
Internal to each module there may be 1 or 2 regions (depending on the
ordered capacity) for Flash storage. These regions are largely
independent of one another and are each given their own status indicator
LED on the front of the Flash module as illustrated in the figure below.
Figure 30 - Flash Module
The LEDs can be used to determine the state of the module based on the
following:
Steady Green Power, status good
Blinking Green Activity, status good
Orange RAID Rebuilding, Degraded, Disabling
Blinking Orange User initiated identification of module
(See Section 4.4.2)
Red Fail
Flash Status
Indicator LEDs