BTRFS filesystem
- If you have virtual images on a btrfs, cow(copy on write) will cause a lot of fragmentation, turn it of for the directory of file with
- this disables cow(fragmentation) and also crc calculations on the files.
chatter +C /path
- this disables cow(fragmentation) and also crc calculations on the files.
- defrag with
btrfs filesystem defragment /path/file
- or faster for large files
cp --reflink=never vbox.vdi vbox.new.vdi ; rm vbox.vdi ;
- Create raid array, raid1 all data mirrored once.
- # mkfs.btrfs -m raid1 -d raid1 -L root /dev/disk/by-label/root1 /dev/disk/by-label/root2 /dev/disk/by-lab
el/root3 /dev/disk/by-label/root4
- Mount options, add compress
- subvolumes
- mount option subvol=homevol
HP Server Raid tools
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