Got excited too quickly on one thing... reading single zfs file does give me
almost same speed as dd /dev/dsk... around 78MB/s... however, creating a
2-drive stripe, still doesn't perform as well as it ought to:
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
294.3 0.0 37675.6 0.0 0.0 0.4 0.0 1.4 0 40 c3d0
293.0 0.0 37504.9 0.0 0.0 0.4 0.0 1.4 0 40 c3d1
Simultaneous dd on those 2 drives from /dev/dsk runs at 46MB/s per drive.
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
800.4 0.0 44824.6 0.0 0.0 1.8 0.0 2.2 0 99 c3d0
792.1 0.0 44357.9 0.0 0.0 1.8 0.0 2.2 0 98 c3d1
(and in Linux it saturates PCI bus at 60MB/s per drive)
On 5/15/07, Marko Milisavljevic <[EMAIL PROTECTED]> wrote:
set zfs:zfs_prefetch_disable=1
bingo!
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
609.0 0.0 77910.0 0.0 0.0 0.8 0.0 1.4 0 83 c0d0
only 1-2 % slower then dd from /dev/dsk. Do you think this is general
32-bit problem, or specific to this combination of hardware? I am
using PCI/SATA Sil3114 card, and other then ZFS, performance of this
interface has some limitations in Solaris. That is, single drive gives
80MB/s, but doing dd /dev/dsk/xyz simultaneously on 2 drives attached
to the card gives only 46MB/s each. On Linux, however, that gives
60MB/s each, close to saturating theoretical throughput of PCI bus.
Having both drives in zpool stripe gives, with prefetch disabled,
close to 45MB/s each through dd from zfs file.
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