Fibre Channel (SAN)

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New Contributor
Posts: 2
Registered: ‎06-03-2009

portloginshow displays 0 buffer credits for loop device

Hello,

All of my loop storage devices show 0 buffer credits when I do a portloginshow.  Is this normal and how do I find out the actual number of credits that has been negotiated?

Type  PID     World Wide Name        credit df_sz cos
=====================================================
  fe  0100ef 21:20:00:d0:b2:02:bc:c0     0  2048   8  scr=1
  ff  0100ef  21:20:00:d0:b2:02:bc:c0     0     0   8  d_id=FFFC01
  ff  0100ef  21:20:00:d0:b2:02:bc:c0     0     0   8  d_id=FFFFFC

Thanks

External Moderator
Posts: 5,029
Registered: ‎02-23-2004

Re: portloginshow displays 0 buffer credits for loop device

In the Fabric OS Admin Guide.

TechHelp24
New Contributor
Posts: 2
Registered: ‎06-03-2009

Re: portloginshow displays 0 buffer credits for loop device

I have looked at the Admin Guide and it only refrences portloginshow in one section and loop devices are not discussed.  Is there a particular page that would help?

Thanks

Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: portloginshow displays 0 buffer credits for loop device

BB credits for a loop are always displayed as zero. The initiator does not maintain a table of BB credits, it simply relies on primitives R_RDY's to calculate the available credits thus reducing the overhead in the loop.

I never worry about the BB credits zero even on the F ports. U shd be only worried for BB_Credits=0 on E ports most of the times, unless and untill u see some strange timeouts on the host.

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