Erik Lund
2007-May-31 12:46 UTC
[zfs-discuss] Which IO transfer size are zfs using when writing to disk ?
The parameters are: maxphys=0x200000, sd_max_xfer_size = 0x200000 og sd_max_xfer_size = 0x200000 Can i be sure that the IO transfer is 2MB or .... ? I wants to lign up my Sun ST6140 for optimal performance and therefore needs to know the transfer size. This message posted from opensolaris.org
Richard Elling
2007-May-31 14:13 UTC
[zfs-discuss] Which IO transfer size are zfs using when writing to disk ?
Erik Lund wrote:> The parameters are: > maxphys=0x200000, sd_max_xfer_size = 0x200000 og sd_max_xfer_size = 0x200000 > > Can i be sure that the IO transfer is 2MB or .... ?Use iostat or another tool (DTrace iosnoop.d) to see for sure. Note that these are upper limits...> I wants to lign up my Sun ST6140 for optimal performance and therefore needs to know the transfer size.OK, but since this is zfs-discuss, I presume you know that ZFS uses a maximum block size of 128kBytes. -- richard