After spending some time reading up on this whole deal with SSD with "caches" and how they are prone to data losses during power failures, I need some clarifications...
When you guys say "write cache", do you just really mean the on board cache (for both read AND writes)? Or is there a separate cache dedicated to writes? Also, a lot of disks out there have caches (without capacitor/batteries), including the SAS drives from Sun. Aren't they prone to the same exact situation? Just wanted to get this straight, since SSD+disabling write caches seems to be a big deal now - but this problem exists even with regular disks w/o SSD. The only difference with SSD is that it will wear down much quicker than advertised with write cache disabled. If we tell ZFS to use a slice rather than whole disk, it'll disable the use of the disk's cache. This makes me think that ZFS has the option to enable/disable the use of disk cache (I think!). So, shouldn't there be a zfs property that we can use to enable/disable the use of disk cache? Also, how does ZFS (when using slices) tell the disks to not use the cache? Thanks -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
