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Forum Discussion
Compression Overhead?
ReadyNAS 104 with 3x2TB Seagate drives, Raid5 via X-RAID
I'm wondering what the overhead of the built in compression option for shares is? Would turning it on cause a noticeable lag in read/write compared to not having it on? Or is any lag not visible because of the bottleneck of network speeds?
I'm in the midst of a huge transfer to the NAS so I can't test for a while
I'm wondering what the overhead of the built in compression option for shares is? Would turning it on cause a noticeable lag in read/write compared to not having it on? Or is any lag not visible because of the bottleneck of network speeds?
I'm in the midst of a huge transfer to the NAS so I can't test for a while
6 Replies
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- I would think there would be some performance difference. The bottleneck on the 104 is not the gigabit NIC but rather the CPU and/or the RAM (both of which are soldered on i.e. not replaceable)
mdgm wrote: I would think there would be some performance difference. The bottleneck on the 104 is not the gigabit NIC but rather the CPU and/or the RAM (both of which are soldered on i.e. not replaceable)
Very well, but what IS that overhead? "Some" isn't much of an answer, lol. There's no tests that you guys have run that say for example: "on average, use of compression with /drives X from the HCL/ results in a 5% reduction in overall read performance, and a 10% in write performance on a ReadyNAS 104."?- We are just users - same as you.
If I have a chance, I will run a test on my RN102. Maybe you can turn compression on for one of your folders, and see if you can measure any difference?. StephenB wrote: We are just users - same as you.
If I have a chance, I will run a test on my RN102. Maybe you can turn compression on for one of your folders, and see if you can measure any difference?.
My apologies, I thought mdgm there was a NG employee :oops:
Does NG staff ever wander through here?
Sometimes they will post, but not that often.gryhnd wrote: ...Does NG staff ever wander through here? My experience with my rn102 is that overhead due to compression reduced write performance to the NAS from 35MB/s down to about 8-9MB/s. This is using the 6.4.0 firmware, jumbo frames off, compression and snapshots on.
This performance was measured when copying MKV and MP4 files to the NAS, which are relatively incompressible.
Similarly, I experienced 4-5MB/s copying MP3 files (which with and average song, works out to be about 1 files per second).
My experience may not match yours.
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