I have a pair of machines which I have been runnig HAST on for a number of years. It works well, it does what Ineed it to do, and I havent considered the details until recently.
As I udnesratnd it though, the minimum size of block copied is set by default to something quite arge (2 meg). I see whay, but as I am using ZFS on top I am generating lots of writes which are scattered across the disc (ZFS not known for keeping writes all in the same place!). So, is each 512 byte write being turned into a 2 meg write on the secondary ? If so this worries me, as I am about to replcae these drives with SSD's, which I do not want to wearn out with excessive writes. Am I worrying over nothing ? Should I try and tune the HAST sizes and the zpool ashift to match, or will that trash performances 9some limited experiments suggest it will). -pete. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
