strange observation, the queue depth is (64) meanwhile fw queue depth (65)

["Raphaël Bauduin" <rblists@gmail.com>]

Hi,

I have these messages logged on 2 different servers (one production, one 
stand-by) when using recent vanilla kernels.

I have found references to these logs, but this was supposedly 
introduced in the 2.6.31 kernel.
However, running kernel 2.6.32.61, this message does not appear. It 
appears when running kernel versions 3.12.15, 3.13.1 and 3.13.6. I 
haven't tested other intermediate kernel versions.

We had once the root filesystem remounted read-only on the production 
server, and we found no significant error messages other than the one in 
the subject of this mail. This makes me wary to ignore these messages, 
and since then we went back to kernel 2.6.32.61.... I've tried running 
kernels mentioned above on the stand-by server, and get the errors there 
too.

Here is the exact error message from dmesg:

[ 3776.788033] sd 7:1:0:0: strange observation, the queue depth is (64) 
meanwhile fw queue depth (65)

and below are some other extracts from dmesg.

Both servers have these errors on a RAID1 volume on which the root 
partition is located.

I hope someone can help me to resolve this. I can send any information 
you might require.

Thanks in advance

Raphaël


[    2.978053] SCSI subsystem initialized
[    2.979969] Fusion MPT base driver 3.04.20
[    2.980059] Copyright (c) 1999-2008 LSI Corporation


[    3.712015] ioc0: LSISAS1064E B3: Capabilities={Initiator}

[   16.516096] scsi7 : ioc0: LSISAS1064E B3, FwRev=01182b00h, Ports=1, 
MaxQ=286, IRQ=16
[   16.536672] mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 
2, phy 0, sas_addr 0x500000e01ee1a602
[   16.538312] scsi 7:0:0:0: Direct-Access     FUJITSU  MBC2073RC 
  5201 PQ: 0 ANSI: 5
[   16.542605] mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 
1, phy 1, sas_addr 0x500000e01edab602
[   16.544158] scsi 7:0:1:0: Direct-Access     FUJITSU  MBC2073RC 
  5201 PQ: 0 ANSI: 5
[   16.548445] mptsas: ioc0: attaching raid volume, channel 1, id 0
[   16.549304] scsi 7:1:0:0: Direct-Access     LSILOGIC Logical Volume 
  3000 PQ: 0 ANSI: 2
[   16.556492] sd 7:1:0:0: [sdr] 140623872 512-byte logical blocks: 
(71.9 GB/67.0 GiB)
[   16.556824] sd 7:1:0:0: [sdr] Write Protect is off
[   16.556895] sd 7:1:0:0: [sdr] Mode Sense: 03 00 00 08
[   16.557109] sd 7:1:0:0: [sdr] No Caching mode page found
[   16.557180] sd 7:1:0:0: [sdr] Assuming drive cache: write through
[   16.558258] sd 7:1:0:0: [sdr] No Caching mode page found
[   16.558329] sd 7:1:0:0: [sdr] Assuming drive cache: write through
[   16.575039]  sdr: sdr1 sdr2
[   16.576018] sd 7:1:0:0: [sdr] No Caching mode page found
[   16.576088] sd 7:1:0:0: [sdr] Assuming drive cache: write through
[   16.576356] sd 7:1:0:0: [sdr] Attached SCSI disk

--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html