> On 18/03/10 08:36 PM, Kashif Mumtaz wrote:
> > Hi,
> > I did another test on both machine. And write
> performance on ZFS extraordinary slow.
>
> Which build are you running?
>
> On snv_134, 2x dual-core cpus @ 3GHz and 8Gb ram (my
> desktop), I
> see these results:
>
>
> $ time dd if=/dev/zero of=test.dbf bs=8k
> count=1048576
> 1048576+0 records in
> 1048576+0 records out
>
> real 0m28.224s
> user 0m0.490s
> sys 0m19.061s
>
> This is a dataset on a straight mirrored pool, using
> two SATA2
> drives (320Gb Seagate).
On my Ultra24 with two mirrored 1Tb WD drives 8gb memory and snv_125
I only get :-
rich: ptime dd if=/dev/zero of=test.dbf bs=8k count=1048576
1048576+0 records in
1048576+0 records out
real 1:44.352133699
user 0.444280089
sys 13.526079085
rich: uname -a
SunOS ultra24 5.11 snv_125 i86pc i386 i86pc
rich: zpool status tank
pool: tank
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: scrub completed after 0h30m with 0 errors on Mon Apr 19 02:36:08
2010
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
c1t4d0 ONLINE 0 0 0
errors: No known data errors
rich: ipstat -En c1t3d0
ipstat: Command not found.
rich: iostat -En c1t3d0
c1t3d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: ATA Product: WDC WD1001FALS-0 Revision: 0K05 Serial No:
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 4264 Predictive Failure Analysis: 0
rich: psrinfo -v
Status of virtual processor 0 as of: 04/19/2010 14:23:42
on-line since 12/16/2009 21:56:59.
The i386 processor operates at 3000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 1 as of: 04/19/2010 14:23:42
on-line since 12/16/2009 21:57:03.
The i386 processor operates at 3000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 2 as of: 04/19/2010 14:23:42
on-line since 12/16/2009 21:57:03.
The i386 processor operates at 3000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 3 as of: 04/19/2010 14:23:42
on-line since 12/16/2009 21:57:03.
The i386 processor operates at 3000 MHz,
and has an i387 compatible floating point processor.
Why are my drives so slow?
>
> $ time dd if=test.dbf bs=8k of=/dev/null
> 1048576+0 records in
> 1048576+0 records out
>
> real 0m5.749s
> user 0m0.458s
> sys 0m5.260s
>
>
> James C. McPherson
> --
> Senior Software Engineer, Solaris
> Sun Microsystems
> http://www.jmcp.homeunix.com/blog
> _______________________________________________
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> http://mail.opensolaris.org/mailman/listinfo/zfs-discu
> ss
>
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