Situation:
•After upgrading from Red Hat Enterprise Linux (RHEL) 5.1 to RHEL 5.5 (kernel 2.6.18-53.el5 to 2.6.18-194.8.1.el5), a system started to show IO errors on boot.
•The boot process took more time than before, but there are otherwise no significant problems occuring.
SCSI device sdc: 419430400 512-byte hdwr sectors (214748 MB)
sdc: Write Protect is off
sdc: Mode Sense: 77 00 10 08
SCSI device sdc: drive cache: write back w/ FUA
SCSI device sdc: 419430400 512-byte hdwr sectors (214748 MB)
sdc: Write Protect is off
sdc: Mode Sense: 77 00 10 08
SCSI device sdc: drive cache: write back w/ FUA
sdc:end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
Dev sdc: unable to read RDB block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
unable to read partition table
sd 1:0:0:1: Attached scsi disk sdc
Vendor: SUN Model: LCSM100_S Rev: 0735
Type: Direct-Access ANSI SCSI revision: 05
Solution:
follow below solution to remediate above issue.
•Switching the controller to active/active mode would allow the devices to be probed through both controller ports and prevent the errors.
•An option to speed up the boot process is to rebuild the initrd without the HBA driver kernel modules and then probe the devices post boot, ie
# mkinitrd -v -f --omit-scsi-modules /boot/initrd-2.6.18-194.8.1.el5.img 2.6.18-194.8.1.el5
•After upgrading from Red Hat Enterprise Linux (RHEL) 5.1 to RHEL 5.5 (kernel 2.6.18-53.el5 to 2.6.18-194.8.1.el5), a system started to show IO errors on boot.
•The boot process took more time than before, but there are otherwise no significant problems occuring.
SCSI device sdc: 419430400 512-byte hdwr sectors (214748 MB)
sdc: Write Protect is off
sdc: Mode Sense: 77 00 10 08
SCSI device sdc: drive cache: write back w/ FUA
SCSI device sdc: 419430400 512-byte hdwr sectors (214748 MB)
sdc: Write Protect is off
sdc: Mode Sense: 77 00 10 08
SCSI device sdc: drive cache: write back w/ FUA
sdc:end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
Dev sdc: unable to read RDB block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0
unable to read partition table
sd 1:0:0:1: Attached scsi disk sdc
Vendor: SUN Model: LCSM100_S Rev: 0735
Type: Direct-Access ANSI SCSI revision: 05
Solution:
follow below solution to remediate above issue.
•Switching the controller to active/active mode would allow the devices to be probed through both controller ports and prevent the errors.
•An option to speed up the boot process is to rebuild the initrd without the HBA driver kernel modules and then probe the devices post boot, ie
# mkinitrd -v -f --omit-scsi-modules /boot/initrd-2.6.18-194.8.1.el5.img 2.6.18-194.8.1.el5
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