Thursday, February 24, 2011

RAM that is not volatile

One of the historical problems of the RAM is that it is volatile. The basic operation of the memory means in effect it must be supplied to keep the data. If in a classical computer it is not a real problem in the sense that the data is rarely critical, and a power outage - so boring it may be - is not going to lose millions, it's more annoying in servers.

Currently working with inverters and batteries to keep the memory powered up, but there are other solutions. One of them is NVDIMM. This technology makes torque RAM standard (here, the DDR3-1333) with flash memory. The idea of SMART is to protect society - in case of power failure - the data in flash memory.

The bars offer a capacity of 1 to 4 GB and the company indicates a backup time of 10 seconds per GB, which is made possible by integrating a "SuperCap" on the PCB. This type of capacitors, already used in SSDs SandForce professionals, provides power to the RAM and flash memory time of the backup.

The advantage is obvious: the data are not lost in case of power failure. Functions to verify data integrity are of course part of the SMART but do not mention data encryption, which is a problem. Arrays for servers 1 U (in low profile, so) from 1 to 4 GB are available and strips of 8 GB in a more standard are expected during the second quarter of 2011.

The technology, currently restricted to servers could be used in laptops to replace the conventional hibernation file, which - if effective - may require a significant capacity of the device stocjage, especially for users of DSS.

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