The Performance and Reliability Advantages of nvSRAM versus Battery-Backed SDRAM
Today, there are two primary RAID (Redundant Array of Independent Disks) architectures for maintaining the location of "write journal" information. Older generation RAID subsystems maintain the write journal in battery-backed external SDRAM memory. Because of its importance for fast writes and long retention under power interruption scenarios, newer generation RAID subsystems implement write journaling in separate nvSRAM (non-volatile SRAM) devices. This white paper discusses the merits of implementing write journaling using Simtek nvSRAM.