Christopher George wrote: >> So why buy SSD for ZIL at all? > > For the record, not all SSDs "ignore cache flushes". There are at least > two SSDs sold today that guarantee synchronous write semantics; the > Sun/Oracle LogZilla and the DDRdrive X1. Also, I believe it is more
LogZilla? Are these those STEC-thingies? For the price of those I can buy a battery backed-up RAID-controller and a few conventional drives. For ZIL this will probably do better at a lower price than STEC. The DDRdrive I wouldn't call a flash drive but rather a NVRAM-Card. NVRAM-cards are the proper way to go for ZIL. Someone should build one for < $600, PCIe x1 would be sufficient. Xilinx has some nice Spartans :) > accurate to describe the root cause as not power protecting on-board > volatile caches. As the X25-E does implement the ATA FLUSH > CACHE command, but does not have the required power protection to > avoid transaction (data) loss. You could say the same about hard drives. They also just need a proper protection for their volatile cache... --Arne > > Best regards, > > Christopher George > Founder/CTO > www.ddrdrive.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
