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NV+ transfer speeds suddenly very slow
I have a ReadyNAS NV+ (RND4000) with 4 x Samsung HD154UI 1.5Tb drives in X_RAID, RAIDiator 4.1.10, 256Mb memory. The system has been functioning perfectly for well over 2 years. The transfer speeds...
How Linux File Systems Work
Linux’s ext2, ext3, and ext4 file systems – ext4 being the file system used by Ubuntu and most other current Linux distributions – allocates files in a more intelligent way. Instead of placing multiple files near each other on the hard disk, Linux file systems scatter different files all over the disk leaving a large amount of free space between them, When a file is edited and needs to grow there’s usually plenty of free space for the file to grow into, If fragmentation does occur the file system will attempt to move the files around to reduce fragmentation,
Because of the way this approach works you will start to see fragmentation if your file system fills up. If it’s 95% (or even 80%) full, However the file system is designed to avoid fragmentation in normal use.
If you look at the 2 lines i have highlighted above this could explain why it slows down a lot if the disk is very full the file system will attempt to move the files around to reduce fragmentation so this is going to increase the time it takes to write files to the disk.
Linux’s ext2, ext3, and ext4 file systems – ext4 being the file system used by Ubuntu and most other current Linux distributions – allocates files in a more intelligent way. Instead of placing multiple files near each other on the hard disk, Linux file systems scatter different files all over the disk leaving a large amount of free space between them, When a file is edited and needs to grow there’s usually plenty of free space for the file to grow into, If fragmentation does occur the file system will attempt to move the files around to reduce fragmentation,
Because of the way this approach works you will start to see fragmentation if your file system fills up. If it’s 95% (or even 80%) full, However the file system is designed to avoid fragmentation in normal use.
If you look at the 2 lines i have highlighted above this could explain why it slows down a lot if the disk is very full the file system will attempt to move the files around to reduce fragmentation so this is going to increase the time it takes to write files to the disk.
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