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enabling it sometimes saw large slowdowns). It got turned off by default because the performance story at the time was really unclear (i.e. Unless you're very unusual, you don't need e4defrag. sending discards for deleted files immediately). It could be particularly useful if your filesystem was not mounted with -o discard (i.e. It sends discard requests for unused space on the filesystem. There's also an fstrim command which should work on both ext4 and (I'd think) xfs. (It's now part of the official e2fsprogs). (Check if the new file is better than the old one before replacing).īut as I said, there is usually no need to do this unless a file got a really bad case of fragmentation somehow.įor ext4 the defragger is called e4defrag.
#IDEFRAG LINUX FREE#
Your filesystem should have a good amount of free space as otherwise the probability is high that the new file will just be as fragmented as the old one. If that doesn't give you hundreds or thousands of extents (fragments), it's nothing to worry about.Ī generic defragmentation method is to make a copy of the file and then replace the original with it, such as: cp -a yourfile frag # hdparm -fibmap debian-6.0.6-amd64-netinst.isoįilesystem blocksize 4096, begins at LBA 0 assuming 512 byte sectors.
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You can check file fragmentation using filefrag or hdparm: # filefrag debian-6.0.6-amd64-netinst.isoĭebian-6.0.6-amd64-netinst.iso: 4 extents found XFS has xfs_fsr which works great, so if you absolutely want to use defragmentation, XFS is a good choice. There aren't too many defragmentation solutions for Linux. Once more than one process read/write files concurrently, the disk will have to be everywhere at once anyway. Most filesystems are very good at avoiding fragmentation, and the Linux kernel is good at avoiding ill effects caused by fragmentation. Defragmenting a SSD will do nothing except waste write cycles.Īlthough there may be extreme cases where fragmentation has a noticable effect, such as a sparse file written to in random order (as some BitTorrent clients do), or when the disk runs out of free space, when the last file that was written to will be split up in thousands of fragments as there was no other consecutive space available to fit the needs.īut that's the exception. More so for SSD which do not suffer from seek times like HDD. In general you can just ignore fragmentation altogether.