06-08-2010 05:04 AM
Below is the output of a portbuffershow. Some information is not included because it is not necessary for my question.
User Port Lx Max/Resv Buffer Needed Link Remaining
Port Type Mode Buffers Usage Buffers Distance Buffers
---- ---- ---- ------- ------ ------- --------- ----------
0 F - 8 8 - -
1 - 8 0 - -
2 F - 8 8 - -
3 E - 8 34 34 2km
4 F - 8 8 - -
10 F - 8 8 - -
11 E - 8 8 8 5km
12 - 8 0 - -
This question is about port 11. A distance of 5 km is shown, but in real life this is a distance of about 11 kilometer.
In my opinion a BB credit of 8 is too small... I think I need 18 to operate on this distance at 2 Gb/s.
Is that correct?
I would like to have some advice how to deal with it...
Reason for this question is that maximum throughput we achieve over this ISL is about 100 GB /hour
06-09-2010 12:57 AM
I see RRDY_MODE as portFlag after a portshow. I have to get rid of that flag?
FCSWITCH_HC02:sbadmin> portshow 11
portHealth: No Fabric Watch License
portFlags: 0x10005907 PRESENT ACTIVE E_PORT G_PORT LOGICAL_ONLINE RRDY_MODE LOGIN LED
POD Port: Port is licensed
portState: 1 Online
portPhys: 6 In_Sync
portScn: 16 E_Port Flow control mode 2
port generation number: 1386
portWwn of device(s) connected:
I checked both ISL ports with portcfgshow, and both have ISL R_RDY MODE configured to ON.
I think I need some further reading about this setting.
06-09-2010 11:34 PM
Can I configure both ports with ISL R_RDY MODE off with no penalty?
I expect traffic to be interrupted while configuring both ports...
And, do I need to configure both ports with portcfglongdistance to set the distance to 11 km?
Can use some advice how to deal with this ;-)
Thanks in advance,
06-10-2010 10:41 AM
unless one of the switches on the other end of your ISL is non-Brocade then I can see why R_RDY mode is ON. But if both of your switches on either end of the ISL are Brocade, then I don't see any reason why you shouldn't turn it off. You need to have the same settings on both ends of your ISL (wether ON or OFF). unless you have extended fabric license, portcfglongdistance do you no good. and yes, traffic will be disrupted.
Since I do not know your environment, I can't tell you what to do. But as a general rule, if all of your switches are Brocade brand, then yes, you should set R_RDY mode to off so you could take advantage of the virtual channels within your ISL. You may want to consult Brocade technical support before implementing for your specific environment.
Hope this helps.
06-11-2010 11:56 PM
There is one reason why you may need R_RDY mode in Brocade switches. If you are using a WDM device in your ISL, some WDM devices take active part in the port buffering handling. These devices offload this task from the Brocade switch, they require the R_RDY setting to be on. It depends on your WDM device (if you have any) but it may require this setting to be ON. So check before switching it off because I have already seen that some WDMs don't work with V_RDY.
Hope it helps.
06-17-2010 05:34 AM
A DWDM OTR card works with R-Ready off. TDM cards needs R-Ready on...
I have 8 DCX sw's with E ports using DWDM's, OTR cards.
I have R-Ready off, trunking is on.
portcfglongdistance 8/1 LD 1 300
portcdglongdistance 8/2 LD 1 300