> Unfortunately, the Intel 520 does *not* power protect it's > on-board volatile cache (unlike the Intel 320/710 SSD). > > Intel has an eye-opening technology brief, describing the > benefits of "power-loss data protection" at: > > http://www.intel.com/content/www/us/en/solid-state-drives/ssd-320-series-power-loss-data-protection-brief.html > > Intel's brief also clears up a prior controversy of what types of > data are actually cached, per the brief it's both user and system > data!
So you're saying that SSDs don't generally flush data to stable medium when instructed to? So data written before an fsync is not guaranteed to be seen after a power-down? If that -- ignoring cache flush requests -- is the whole reason why SSDs are so fast, I'm glad I haven't got one yet. _______________________________________________ zfs-discuss mailing list firstname.lastname@example.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss