最近

• XFS + RAID5 + LVM = 66T Single Drive. 可以隨時擴充 Raid or LVM up to EB scale.
• VMware workstation with vmrun command 可以控制很多行為 in Host and Guest.
• PXE 開機 是個好東西 用來網路開機並回復系統, 值得深入一點看.
• File system Limitations....16tb in linux can be solved by adupting XFS file system.
• CentOS:
  yum install -y xfsprogs

  mkfs.xfs -b size=4096 /dev/hda
• GetElementByID sometimes not work in IE and can be replace by using $("#123")[0].
• There is a BUG on the File upload form in IE8, when user wants to get the file path, the method to solve is as: 
• var f = document.getElementById(filefield);
• f.select();  
• var filename = document.selection.createRange().text;
• For showing Ajax status, place following codes in the begin and end of Ajax request:
• $("#status", window.parent.frames[0].document).show();
• $("#status", window.parent.frames[0].document).hide();
• Mdadm
• 可以不用等 sync, ----- mdadm --create --assume-clean /dev/md4 --level=raid5 --raid-devices=4 /dev/sd{n,o,p,q}