Recent content by ddrdrive

One should always use an SSD with power loss protection for a ZFS log device or it defeats the device's fundamental purpose. That is, provide stable storage for the ZIL in case of host failure (crash/power loss). All SSDs have some amount of volatile memory on-board, either as a dedicated...

Supnaut, Are the ZeusRAMs attached to the same LSI 9207 HBA(s) used by the pool SSDs? Have you tried a dedicated HBA/chassis for the log devices (ZIL)? Log device/pool IO contention can be a serious performance bottleneck. Christopher George www.ddrdrive.com

Your correct, a log device (ZIL) must power protect all on-board volatile caches and the DDRdrive X1 does using either a SuperCap PowerPack or small external UPS. As far as comparing to a Flash based SSD, my OpenStorage Summit 2011 presentation might be of interest...