Hi,

we have linux box (version RHEL AS 5.3) with single HBA which is connected to the SAN. We are using Powerpath for multipathing and have disabled native multipathing. When we reboot the machine we see the below mentioned errors in the messages file:
Aug 19 10:40:34 imageprod1 kernel: Vendor: DGC Model: RAID 5 Rev: 0324
Aug 19 10:40:34 imageprod1 kernel: Type: Direct-Access ANSI SCSI revision: 04
Aug 19 10:40:34 imageprod1 kernel: SCSI device sdc: 1681671936 512-byte hdwr sectors (861016 MB)
Aug 19 10:40:34 imageprod1 kernel: sdc: test WP failed, assume Write Enabled
Aug 19 10:40:34 imageprod1 kernel: sdc: asking for cache data failed
Aug 19 10:40:34 imageprod1 kernel: sdc: assuming drive cache: write through
Aug 19 10:40:34 imageprod1 kernel: SCSI device sdc: 1681671936 512-byte hdwr sectors (861016 MB)
Aug 19 10:40:34 imageprod1 kernel: sdc: test WP failed, assume Write Enabled
Aug 19 10:40:35 imageprod1 kernel: sdc: asking for cache data failed
Aug 19 10:40:35 imageprod1 kernel: sdc: assuming drive cache: write through
Aug 19 10:40:35 imageprod1 kernel: sdc:<6>sd 1:0:0:1: Device not ready: <6>: Current: sense key: Not Ready
Aug 19 10:40:35 imageprod1 kernel: Add. Sense: Logical unit not ready, manual intervention required
Aug 19 10:40:35 imageprod1 kernel:
Aug 19 10:40:35 imageprod1 kernel: end_request: I/O error, dev sdc, sector 0
Aug 19 10:40:35 imageprod1 kernel: sd 1:0:0:1: Device not ready: <6>: Current: sense key: Not Ready
Aug 19 10:40:35 imageprod1 kernel: Add. Sense: Logical unit not ready, manual intervention required
Aug 19 10:40:35 imageprod1 kernel:
Aug 19 10:40:35 imageprod1 kernel: end_request: I/O error, dev sdc, sector 0
Aug 19 10:40:35 imageprod1 kernel: sd 1:0:0:1: Device not ready: <6>: Current: sense key: Not Ready
Aug 19 10:40:35 imageprod1 kernel: Add. Sense: Logical unit not ready, manual intervention required
Aug 19 10:40:35 imageprod1 kernel:
Aug 19 10:40:35 imageprod1 kernel: end_request: I/O error, dev sdc, sector 0
Aug 19 10:40:35 imageprod1 kernel: sd 1:0:0:1: Device not ready: <6>: Current: sense key: Not Ready
Aug 19 10:40:35 imageprod1 kernel: Add. Sense: Logical unit not ready, manual intervention required


Can anyone please suggest how to get rid of these errors. Any Help wud be much appreciated.

Thanks

Hi,

which failover mode is configured on the EMC? Is the LUN accessible? Does this errors only show up during reboot? What HBA is used? What parameters are passed in modprobe.conf to the HBA?

Hi,

Thanks for your reply.
Array failover mode: 1
The LUN is accessible.
The erros are seen only during boot time.
modprobe.conf file:
alias eth0 bnx2
alias eth1 bnx2
alias scsi_hostadapter megaraid_sas
alias scsi_hostadapter1 ata_piix
alias scsi_hostadapter3 usb-storage
###BEGINPP
include /etc/modprobe.conf.pp
###ENDPP
alias scsi_hostadapter2 qla2xxx

Hope i have provided all required information.
Appreciate your help.

Thanks,
Ramya

Hi,

this is a known message in case of using Linux native multipathing. It is created during first time access to the passive storage path. Powerpoath should suppress the message. Did you check EMC knowlaedge base ID: emc187631 ? Do you use the last version of powerpath and naviagent?

emc187631 says "...The errors can safely be filtered through the OS logging configuration ..."

Now my syslog.conf suppresses all kernel-type errors (see below) yet I still get the I/O errors described here.


#kern.* /dev/console


Any suggestions on how to fix? Or is this fixable?

(I am running Oracle Enterprise Linux 5 update 4 on HP Proliant BL 460c; system was originally native multipath but is now Powerpath version 5.3)