Brilliant!
With both cards on the primary controller throughput is more than 2x on
the Sun 6140 (asymmetric).
I suppose I would need a symmetric array, such as the Sun 3510, to
determine how much of a boost a second *active* controller would
provide.
iostat -X 2
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd20 0.0 155.5 0.0 128668.7 0.0 1.0 6.2 0 83
sd20.fp1 0.0 80.0 0.0 65685.4 0.0 0.0 0.0 0 0
sd20.fp0 0.0 75.5 0.0 62983.3 0.0 0.0 0.0 0 0
sd21 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd21.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd21.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
ses17.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
ses17.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd3 0.0 2.0 0.0 1.5 0.0 0.0 4.2 0 0
sd4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd20 0.0 153.5 0.0 132746.6 0.0 0.9 5.8 0 81
sd20.fp1 0.0 78.0 0.0 65676.1 0.0 0.0 0.0 0 0
sd20.fp0 0.0 75.5 0.0 67070.6 0.0 0.0 0.0 0 0
sd21 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd21.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd21.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd22.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
sd23.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
ses17.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
ses17.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Louwtjie
Burger
Sent: Tuesday, October 16, 2007 12:48 PM
Cc: [email protected]
Subject: Re: [storage-discuss] Only primary MPxIO channel gets IOs
Connect both cards to the primary controller on different ports and see
what happens...
On 10/16/07, Srikanth, Ramana <[EMAIL PROTECTED]> wrote:
> Oren,
> You are seeing expected behavior, which is dependent on the type of
> the array.
> The 6140 is a ASYMMETRIC array with ACTIVE-STANDBY configuration.
> The STANDBY path (will become ACTIVE and accept IOs) only when the
> current ACTIVE path is down.
>
> I'm not sure about the model of the Equallogic array, but based on the
> behavior, I guess the array is a SYMMETRIC device.
> The symmetric device uses an ACTIVE-ACTIVE configuration where the IOs
> are accepted on both the channels.
> If you hook up the Equallogic array to Solaris (and the 6140 to Linus,
> if Linux supports it) you should see the same array dependent
behavior.
>
> Let us know if you get a chance.
>
> /Ramana
>
> I believe the Equallogic array is
> > Oren Lion wrote:
> >
> >> Hi,
> >>
> >> I was surprised to observe only the primary MPxIO channel getting
IOs (see below iostat for fp0) while my expectation was to see IOs
distributed (round-robin) on both paths, fp0 and fp1, with higher
throughput than IOs only on single channel.
> >>
> >> As a sanity check to compare against iostat I ran Qlogic's
SANsurfer GUI tool to observe HBA performance, sure enough, only a
single HBA was servicing IO requests.
> >>
> >> Running a similar test on Linux against an EqualLogic array I
observed multipath sending IOs down multiple channels.
> >>
> >> Is my expectation with Solaris x86 MPxIO valid?
> >>
> >> Config:
> >> V40z 8-core, 16 GB RAM, latest Recommended Patch (uname -a returns
> >> patch level 127112-01) 2x Sun StroageTek PCI-X (QLogic) 4Gb Single
> >> Port HBA Sun 6140, 4GB cache, 16x 15K RPM drives, RAID 10
> >>
> >> snippet /var/adm/messages
> >> Oct 12 11:13:26 z8 genunix: [ID 834635 kern.info]
> >> /scsi_vhci/[EMAIL PROTECTED] (sd19) multipath
> >> status: degraded, path
> >> /[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci1077,[EMAIL
> >> PROTECTED]/[EMAIL PROTECTED],0 (fp1) to target
> >> address: w201400a0b82a3946,0 is standby Load balancing: round-robin
> >> Oct 12 11:13:26 z8 genunix: [ID 834635 kern.info]
> >> /scsi_vhci/[EMAIL PROTECTED] (sd19) multipath
> >> status: optimal, path /[EMAIL PROTECTED],0/pci1022,[EMAIL
> >> PROTECTED]/pci1077,[EMAIL PROTECTED]/[EMAIL PROTECTED],0
> >> (fp0) to target address: w201500a0b82a3946,0 is online Load
> >> balancing: round-robin
> >>
> >> iostat -X 2
> >>
> >> extended device statistics
> >> device r/s w/s kr/s kw/s wait actv svc_t %w %b
> >> sd3 0.0 77.5 0.0 51193.6 0.0 1.0 12.5 0 76
> >> sd4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd19 58.5 0.0 50681.6 0.0 0.0 0.7 12.0 0 70
> >> sd19.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd19.fp0 58.5 0.0 50681.6 0.0 0.0 0.0 0.0 0 0
> >> ses16.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> ses17.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> extended device statistics
> >> device r/s w/s kr/s kw/s wait actv svc_t %w %b
> >> sd3 0.0 56.0 0.0 51204.8 0.0 0.7 12.4 0 69
> >> sd4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd19 59.0 0.0 51204.8 0.0 0.0 0.7 11.8 0 69
> >> sd19.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> sd19.fp0 59.0 0.0 51204.9 0.0 0.0 0.0 0.0 0 0
> >> ses16.fp1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >> ses17.fp0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
> >>
> >>
> >> This message posted from opensolaris.org
> >> _______________________________________________
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> >>
> >>
> >>
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