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Forum Discussion
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 have never been great (I have a couple of Netgear GS608 switches) but somewhere approaching 10Mbit. However, recently this has dropped dramatically, and now I'm lucky if I get 1Mbit - which isn't even enough to stream HD video to my media player without it glitching every 10 seconds. All these speeds to a Vaio i5 laptop over hard wired ethernet via the Netgear switch.
The ReadyNAS is now around 95% full - could this be a factor?
I've not changed any settings at all for months and months - in fact not since I first got the device, when I experimented with jumbo frames, etc to get the best performance (jumbo frames are off BTW)
Any ideas? When it now takes 30 mins to copy a 2Gb file this is not a very workable system any more!
Thanks.
The transfer speeds have never been great (I have a couple of Netgear GS608 switches) but somewhere approaching 10Mbit. However, recently this has dropped dramatically, and now I'm lucky if I get 1Mbit - which isn't even enough to stream HD video to my media player without it glitching every 10 seconds. All these speeds to a Vaio i5 laptop over hard wired ethernet via the Netgear switch.
The ReadyNAS is now around 95% full - could this be a factor?
I've not changed any settings at all for months and months - in fact not since I first got the device, when I experimented with jumbo frames, etc to get the best performance (jumbo frames are off BTW)
Any ideas? When it now takes 30 mins to copy a 2Gb file this is not a very workable system any more!
Thanks.
8 Replies
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- With the volume being 95% full this could well be a factor for slow speeds but does not mean it definitely is the coarse the only way to test that is to move some of the data off somewhere to free up some space and see if it makes a difference.
- Other people have reported slowdowns here when the volume capacity reaches 90%.
- Here's the results of a Robocopy I've just run overnight. 24 hours to copy 66Gb to a USB 2 drive via Ethernet... something's badly wrong here. Any further ideas?
------------------------------------------------------------------------------
Total Copied Skipped Mismatch FAILED Extras
Dirs : 12 11 1 0 0 0
Files : 1569 1569 0 0 0 0
Bytes : 66.455 g 66.455 g 0 0 0 0
Times : 23:13:14 23:13:09 0:00:00 0:00:04
Speed : 853652 Bytes/sec.
Speed : 48.846 MegaBytes/min.
Ended : Mon Oct 22 13:22:12 2012 - I've got a similar problem.
I have installed 2 Seagate ST3000DM001 (3TB).
When one disk gets filled over 2 TB the speed dropes down from
over 400 Mb/s to less than 10 Mb/s.
Is that an issue with the Linux file system? - 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. - So, how does one defragment an NV+? If that's even possible?
The NV+ v2 uses ext4, so as Herbieo says it will move files around automatically to avoid fragmentation.spwyatt wrote: So, how does one defragment an NV+? If that's even possible?
The NV+ v1 will not do this (it uses ext2/ext3), and it cannot be defragmented. You have a v1 (running 4.1.x firmware).- ext2/3/4 preventing fragmentation same way (when there is free space on disc). but ext4 can be defragmented online with e4defrag.
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