talking of which,
what's the effort and consequences to increase the max allowed block
size in zfs to highr figures like 1M...
s.
On 3/28/07, Jonathan Edwards <[EMAIL PROTECTED]> wrote:
right on for optimizing throughput on solaris .. a couple of notes
though (also mentioned in the QFS manuals):
- on x86/x64 you're just going to have an sd.conf so just increase
the max_xfer_size for all with a line at the bottom like:
sd_max_xfer_size=0x800000;
(note: if you look at the source the ssd driver is built from the sd
source .. it got collapsed back down to sd in S10 x86)
- ssd_max_throttle or sd_max_throttle is typically a point of
contention that has had many years of history with storage vendors ..
this will limit the maximum queue depth across the board for all sd
or ssd devices (read all disks) .. if you're using the native
Leadville stack, there is a dynamic throttle that should adjust per
target, so you really shouldn't have to set this unless you're seeing
command timeouts either on the port or on the host. By tuning this
down you can affect performance on the root drives as well as
external storage making solaris appear slower than it may or may not be.
- ZFS has a maximum block size of 128KB - so i don't think that
tuning up maxphys and the max transfer sizes to 8MB isn't going to
make that much difference here .. if you want larger block transfers
(possibly matching to a full stripe width) you'd have to either go
with QFS or raw - (but note that with larger block transfers you can
get into higher cache latency response times depending on the storage
controller .. and that's a whole other discussion)
On Mar 27, 2007, at 08:24, Rayson Ho wrote:
> BTW, did anyone try this??
>
> http://blogs.sun.com/ValdisFilks/entry/improving_i_o_throughput_for
>
> Rayson
>
>
>
> On 3/27/07, Wee Yeh Tan <[EMAIL PROTECTED]> wrote:
>> As promised. I got my 6140 SATA delivered yesterday and I hooked it
>> up to a T2000 on S10u3. The T2000 saw the disks straight away and is
>> "working" for the last 1 hour. I'll be running some benchmarks on
>> it.
>> I'll probably have a week with it until our vendor comes around and
>> steals it from me.
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
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