Linux and Unix tutorials for new and seasoned sysadmin
Linux and Unix tutorials for new and seasoned sysadmin
I‘ve used the mdadm command line utility to setup and manage software RAID 6 under Debian Linux server. However, I get the following message in /var/log/messages file:
[ 14.003707] JBD: barrier-based sync failed on md0-8 – disabling barriers
How do I fix the message ‘JBD error message “barrier-based sync failed”‘?
How do I set up a serial console on Debian Linux HP server for troubleshooting and login purpose?
My hosting company disabled SELinux protection. How do I turn on SELinux over remote ssh session without distributing existing networking services?
In our research lab I’d like to disable all USB devices connected to our HP Red Hat Linux based workstations. I’d like to disable USB flash or hard drives, which users can use with physical access to a system to quickly copy sensitive data from it. How do I disable USB device support under RHEL 5.x workstation operating systems?
Q. I know how to force fsck on the next reboot using /forcefsck file. But how do I skip or bypass a fsck on reboot? How to stop a FSCK from prompting or running automatically when rebooting server.
Q. My CDROM drive attached to Stratus ftServer 6210 is not working and it is dumping me with following error:
hdb: lost interrupt
hdb: lost interrupthdb: lost interrupt
hdb: status error: status=0x59 { DriverReady SeekComplete DataRequest
Error }
hdb: status error: status=0x40 { LastFailedSense=0x04 }
ide: failed opcode was: unknown
hdb: drive not ready for command
hdb: lost interrupt
hdb: status error: status=0x59 { DriverReady SeekComplete DataRequest
Error }
hdb: status error: status=0x40 { LastFailedSense=0x04 }
How do I fix this error under Linux?
How do I check and configure serial ports under Linux for various purposes such as modem, connecting null modems or connect a dumb terminal?
Continue reading “How To Check and Use Serial Ports Under Linux”