On Mon, Oct 3, 2016 at 7:40 AM -0400, "andrei.borzenkov@ts.fujitsu.com" <andrei.borzenkov@ts.fujitsu.com> wrote:

What FC ports are you using on the FAS8040 (onboard/PCIe Card)?

[Borzenkov, Andrei] onboard

how about the sysconfig -a for the FC ports involved (not the whole thing!)?

[Borzenkov, Andrei]

       slot 0: FC Host Adapter 0e (QLogic 8324 rev. 2, N-port, <UP>)

              Firmware rev:      7.5.0

              Host Port Id:      0x10100

              FC Node Name:      5:00a:098003:8826d0

              FC Port Name:      5:00a:098003:8826d0

              SFP Vendor:        AVAGO

              SFP Part Number:   AFBR-57F5MZ-NA1

              SFP Serial Number: AC1609J00D5

              SFP Capabilities: 4, 8 or 16 Gbit

Others are the same

Do you have the correct SFP+s in the FAS8040?

[Borzenkov, Andrei] Whatever NetApp ships with FAS8040.

Where did they come from?

[Borzenkov, Andrei] NetApp

Did you take them from the FAS3140 (X6539 -> 4Gb)?

[Borzenkov, Andrei] Of course, not. You seriously expect link to come up at 8G with 4G SFPs?

(if so, those are likely 4Gb)

The supported ones on the FAS8040 are X6596->16Gb

[Borzenkov, Andrei] Yes, I know.

Of course, if you are using a PCIe crad, that would be different too.

--tmac

Tim McCarthy, Principal Consultant

Proud Member of the #NetAppATeam

I Blog at TMACsRack

NetApp Candidate ID: NETAPP00041276

FlexPod Design: Oct 2015 - Jan 2018, S0N62WE1BMVEYF3M

FlexPod Implementation: Oct 2015 - Jan 2018, JH3QJT4KLEQ41HPH

     RHCE6 110-107-141

On Mon, Oct 3, 2016 at 5:32 AM, andrei.borzenkov@ts.fujitsu.com <andrei.borzenkov@ts.fujitsu.com> wrote:

This weekend I did head swap from FAS3140 to FAS8040 in 7-Mode FMC. Storage is DS14mk4 and one DS2246 that was added later. Backend switches are Brocade 300 so we tried to change HBA ports from 4G to 8G hoping to boost overall performance. But almost immediately I observed intermittent

Sat Oct 1 23:00:08 YEKT [netapp2:cf.fsm.takeoverOfPartnerDisabled:error]: Failover monitor: takeover of netapp1 disabled (status of backup mailbox is uncertain).
Sat Oct 1 23:00:14 YEKT [netapp2:cf.fsm.takeoverOfPartnerEnabled:notice]: Failover monitor: takeover of netapp1 enabled

On both heads. There was no load, all applications were still stopped at this point. There were no other errors visible in logs.

Looking on switches, the only errors reported for ports were c3 discards. They were most frequent on DS14 ports, but also happened for HBA and even ATTO ports (1 and 13 in this example). Statistic is collected several minutes after resetting counters.

netapp2_fcsw1:admin> porterrshow
frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout
tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx
=======================================================================================================================
0: 124.5k 90.9k 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1: 327.5k 290.8k 0 0 0 0 0 0 0 3 0 0 0 0 0 0 3
2: 278.4k 244.0k 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
3: 27.0k 29.1k 0 0 0 0 0 0 0 102 0 0 0 0 0 0 102
4: 426.5k 474.3k 0 0 0 0 0 0 0 324 0 0 0 0 0 324 0
5: 41.9k 48.9k 0 0 0 0 0 0 0 120 0 0 0 0 0 0 120
6: 98.8k 109.8k 0 0 0 0 0 0 0 6 0 0 0 0 0 0 6
7: 111.4k 133.1k 0 0 0 0 0 0 0 2 0 0 0 0 0 0 2
8: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
9: 56.2k 64.0k 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1
10: 13.4k 14.9k 0 0 0 0 0 0 0 52 0 0 0 0 0 0 52
11: 46.4k 50.4k 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
12: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
13: 22.0k 23.8k 0 0 0 0 0 0 0 38 0 0 0 0 0 0 38
14: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
16: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
17: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
18: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
19: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
20: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
21: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
22: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
23: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I could not find any best practice or recommendation regarding port speeds in such configuration (actually, documentation recommends setting port speed to maximum supported by connected device, which in this case means 8G). After forcing HBA back to 4G the above messages and c3 discards went away.

So I'm looking for practical experience in this area. May be there are some settings we missed. Switches are running 7.0.2b (minimal version matching IMT). Shelf firmware is the latest. Data ONTAP is 8.2.4P4.

---
With best regards

Andrei Borzenkov
Senior system engineer
FTS WEMEAI RUC RU SC TMS FOS

FUJITSU
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E-mail: Andrei.Borzenkov@ts.fujitsu.com
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