qla2300 read buffer problems

Hi all,

we are encountering SAN problems. Twice or threetimes a minute we can neither read nor write for up to five seconds from/to our LUs. After that short periode, it catches up and resumes normally. The diagnostics in SANsurfer (Read/Write Buffer Test) runs a few times successfully (approx. 8-10 times) and then tells us about a problem with the buffer cache:
Info: DiagRWBufferTest: Unable to send Pass-Thru READ_DATA_BUFF on target (50-06-0e-80-00-c2-8a-03) (0x20000040) (SCSI check condition)
Info: DiagRWBufferTest: Sense Key: 0xe, asc: 0x1d, ascq: 0x0.

The numbers of "Link Failure", "Sync Loss" and "Signal Loss" are also increasing.

After compiling the modules with almost every debug option the syslogd notices the following lines:
qla2x00_scsi_passthru(18): entered. qla2x00_get_ioctl_scrap_mem(18): inst=0 entered. size=348. qla2x00_get_ioctl_scrap_mem(18): exiting. ret=0. qla2x00_get_ioctl_scrap_mem(18): inst=0 entered. size=764. qla2x00_get_ioctl_scrap_mem(18): exiting. ret=0. qla2x00_get_ioctl_scrap_mem(18): inst=0 entered. size=160. qla2x00_get_ioctl_scrap_mem(18): exiting. ret=0. qla2x00_scsi_passthru(18): got FC SCSI passthru cmd. qla2x00_sc_fc_scsi_passthru(18): inst=0 entered. qla2x00_get_ioctl_scrap_mem(18): inst=0 entered. size=352. qla2x00_get_ioctl_scrap_mem(18): exiting. ret=0. qla2x00_sc_fc_scsi_passthru(18): inst=0 cmd for loopid=0081 L=0000 WWPN=50060e8000c28a03.
qla2x00_sc_fc_scsi_passthru Dump of cdb buffer:
0 1 2 3 4 5 6 7 8 9 Ah Bh Ch Dh Eh Fh
--------------------------------------------------------------
3c 02 00 00 00 00 00 00 08 00 00 00 00 00 00 00 qla2x00_sc_fc_scsi_passthru(18): inst=0 queuing command. qla2x00_ioctl_scsi_queuecommand(18): entered. qla2x00_ioctl_scsi_queuecommand(18): ha instance=0 tq=ec2d2800 lq=f10767c0 pfclun=f2cdc8c0 pfcport=f2b09780.

        CDB=3c 02 00 00; b=0 t=ff l=0.

qla2x00_ioctl_scsi_queuecommand(18): inst=0 sending command. qla2x00_ioctl_scsi_queuecommand(18): exiting. qla2x00_scsi_pt_done post function called OK
qla2x00_scsi_pt_done: exiting. qla2x00_sc_fc_scsi_passthru(18): inst=0 data underrun or scsi err. host status =0x0, scsi status = 0x302. qla2x00_sc_fc_scsi_passthru(18): inst=0 done. host status=0x0, scsi status=0x302.
qla2x00_sc_fc_scsi_passthru(18): inst=0 sense[0]=70 sense[2]=e. qla2x00_sc_fc_scsi_passthru(18): inst=0 copying data. qla2x00_sc_fc_scsi_passthru(18): inst=0 exiting. qla2x00_free_ioctl_scrap_mem(18): inst=0 entered. qla2x00_free_ioctl_scrap_mem(18): exiting. qla2x00_scsi_passthru(18): exiting.

Sense Key 0xe means "data mismatch". But what does "scsi status=0x302" mean? I didn't find any explaination on google. What causes the buffer test to fail? Is the buffer a local buffer or a buffer on the storage box? Which debug switches can I turn to inverstigate that signal loss issue?

I think I can exclude bad cables or defective ports on our switches and HBAs, because we have four servers with two pathes each showing the same errors. We are using qla2342-HBAs with SLES9. Our Storage Box is a HDS 9580V and doesn't require special qla2xxx parameter settings according to Hitachi. I've already tested the plain driver 8.00.02 from qlogic and a version provided by HP (also 8.00.02). Currently I'm using 8.00.03b1. All versions show the same error behaviour.

Kind regards,
Andreas Rother

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These traces are not from the in-kernel qla2xxx driver. Either use the proper driver or complain to qlogic tech support.

That's a miscompare error with asc/ascq specifying miscompare on verify ... it shouldn't be the product of a READ_BUFFER command it should be the product of a VERIFY command, so there might be something wrong with your storage.

James