Home > Storage > PowerScale (Isilon) > Product Documentation > Storage (general) > PowerScale All-Flash F210, F710 & F910 > Journal enhancements
The OneFS journal in the new PowerScale all-flash nodes uses a 32 GB Dell Software Defined Persistent Memory (SDPM) technology configuration. Previous platforms used NVDIMM-n for persistent memory, which consumed a DIMM slot. The BIOS-managed SDPM is a vault solution with a single module comprised of the Battery Backup Unit (BBU) and the Vault Optimized Storage Solution (VOSS) NVMe M.2 drive. Data is copied from DDR5 DIMMs to the VOSS module during power loss. The F210 and F710 have a single BBU, while the F910 has dual BBUs.