On Mon, 27 Apr 2015 10:18:19 AM Craig Sanders wrote:
but now ZFS can use an SSD (or other fast block device) as ZIL, and kernel modules like bcache[1] and facebook's flashcache[2] can provide the same kind of caching using any fast block device for any filesystem.
so, that one advantage is gone, and has been for several years now.
[1] http://en.wikipedia.org/wiki/Bcache [2] http://en.wikipedia.org/wiki/Flashcache
I recommend that JBOD be used for ZFS on servers, but if not using ZFS then hardware RAID gives benefits. It's very rare that I see any mention of Bcache except in the context of data loss, it's known to lose data with some recent versions of BTRFS. I recommend not using bcache on servers at this time, use it on test systems that have good backups. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/