Re: IscsiSessionStatsEntry MIB OBject contents

["Thomas McSweeney" <rf42tpme@us.ibm.com>]

Gwendal,

Login PDU and Login Response PDU are not counted in iscsiSsnRspPdus or
iscsiSsnCmdPdus because the session is not instantiated until full feature
phase (after Login Response).  There are separate counters for Login
attempts - see the ...LoginStatsEntry definitions.  All other PDUs are
counted, including Data In and Data Out.  I suppose we could discuss
whether Logout and Logout Response should be counted, since they have
separate counters in the MIB as well (see the ...LogoutStatsEntry
definitions).

As for the Data Octet counters, the easiest interpretation is that it
refers to all octets in all PDU Data Segments.  I think the count will be
most useful if it counts only the bytes of data actually read from or
written to the SCSI device (e.g., it includes only the Data Segments of
Data Out and Data In PDUs).  However, I suspect that the sum total of all
other PDU Data Segments will be so small compared to the Data Out and Data
In that it would not hurt to lump those in.

Tom McSweeney
iSCSI Development, Storage Systems Group, IBM
Email: rf42tpme@us.ibm.com
Phone: (USA) 919-254-5634  (tie line: 444-5634)
Fax:   (USA) 919-254-0391  (tie line: 444-0391)