2006隨手札記

Advanced Filesystem Management Tools: #tar #dump #restore Ex: dump -0u -f /dev/nst0 /dev/hda2 restore -rf /dev/nst0 0: full backup u: update f : file r: precludes an interac-tive file extraction and can be detrimental to one’s health (not to mention the disk) if not used carefully. nst: tape(device) dump -0u -f /tmp/data-backup.dump /dev/hda2 restore -rf /tmp/data-backup.dump (1)Raid Configuration file: /etc/mdadm.conf %Raid 0, 1, 5 and 6 %Raid devices are named: /dev/md0, /dev/md1, /dev/md2, and so on %Create and define Raid devices #madam -C /dev/md0 -l 5 -n 3 /dev/sdb{2,3,5} -x 1 /dev/sdb6 -l : raid level -n: sets the number of Raid disks -x: spare device #mkfs.ext3 /dev/md0 %disk fail #mdam /dev/md0 -f /dev/sdb2 %change disk %add to /dev/md0 #mdadm /dev/md0 -a /dev/sdb2 %檢查狀態 #cat /proc/mdstat %停止raid #mdadm -S /dev/md0 %重新啟動 #mdadm -As -A : assemble -s : scan * 必須先寫入/etc/mdadm.conf 才能啟動[#mdadm --detail --scan > /etc/mdadm.conf]