Get a list of all disks and show the serial numbers
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#!/bin/bash if [ ! -x /usr/sbin/hdparm ] ; then echo "Missing hdparm" exit 1 fi for disk in /dev/sd?; do echo "$disk: `hdparm -I $disk | grep "Serial Number:" | awk '{ print $3 }'`" done |
Another wrapper (like mdstat), that’ll look through my Western Digital disks and fix any disk not having the head parking timeout set to a configured value.
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#!/bin/bash FIRMWARE_TIMEOUT_SH=138 if [ ! -x /usr/sbin/idle3ctl ] ; then echo "idle3-tools is missing." exit 1 fi for disk in /dev/sd?; do # idle time should be set to: 138 (300s) # 138-128=10 # 10x30=300 seconds FIRMWARE_TIMEOUT_IS="$( /usr/sbin/idle3ctl -g $disk | awk '{ print $5 }' )" if [ "$FIRMWARE_TIMEOUT_IS" -ne "$FIRMWARE_TIMEOUT_SH" ]; then /usr/sbin/idle3ctl -s$FIRMWARE_TIMEOUT_SH $disk fi done |
Since I’ve been playing with my AutoYAST setup for the last few days, working out the kinks (for example SLES10 not being able to install into the MBR), I needed a way to zap the MBR (as in remove grub to see whether or not the installation would install a new loader). So after quickly googling, I found this:
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dd if=/dev/zero of=/dev/hda bs=512 count=1 |
That actually does the trick. The loader as well as the partition table are gone after wards!
I just googled again for a Gigabyte to Blocks converter when I stumbled upon this:
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echo "(15*1024*1024*1024)/512" | bc |
Easy to use and yet handy.
Well, today I had a rather weird error. I was testing the adapter bonding on one of the boxen designated as Tivoli Storage Manager Server, when I noticed that the bonding wasn’t working as expected when simulating an error (that is unplugging one of the TP cables for the bond).
Now, the bond had “mode=6 miimon=100” as options. After running “linux bond debug” through Google (which turned up nothing useful, besides one document on the Oracle Wiki about IOS/Linux adapter teaming), I figured “Hey, just lets test switching the arguments.” And guess what ?
Afterwards, it just works when you unplug one of the cables of the bond, while it didn’t work before … *shrug*