2011-10-10T18:05:21+07:00 http://olragon.info/ Long Nguyen 2011-10-10T11:13:00+07:00 http://olragon.info/blog/2011/10/10/sysadmin-cheatsheet <h2>Rsync</h2> <h3>Rsync over ssh</h3> <p><code>rsync -avz -e ssh remoteuser@remotehost:/remote/dir /this/dir/</code></p> <h2>Raid</h2> <h3>Create software raid array</h3> <p>Create new raid array: <code>sudo mdadm –create /dev/md3 –level=1 –raid-devices=2 /dev/sdb1 /dev/sdd</code></p> <p>Save raid array config: <code>mdadm –detail –scan &gt; /etc/mdadm/mdadm.conf</code></p> <p>Copy UUID: <code>ls -l /dev/disk/by-uuid/ | grep md3</code></p> <p>Add new mount point using UUID: <code>sudo nano /etc/fstab</code></p> <h3>Delete software raid array</h3> <p>Find raid array name: <code>cat /proc/mdstat</code></p> <p>Stop raid array: <code>sudo mdadm -S /dev/md_d3</code> (replace md_d3!)</p> <p>Clear superblock:</p> <ul> <li><p><code>sudo mdadm –zero-superblock /dev/sdb1</code></p></li> <li><p><code>sudo mdadm –zero-superblock /dev/sdd1</code></p></li> </ul>