Re: [zfs-discuss] Which IO transfer size are zfs using when writing to disk ?

2007-05-31 Thread Richard Elling

Erik Lund wrote:

The parameters are:
maxphys=0x20, sd_max_xfer_size = 0x20 og sd_max_xfer_size = 0x20

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
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[zfs-discuss] Which IO transfer size are zfs using when writing to disk ?

2007-05-31 Thread Erik Lund
The parameters are:
maxphys=0x20, sd_max_xfer_size = 0x20 og sd_max_xfer_size = 0x20

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.
 
 
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