Reads are 50% of the speed of writes.

Discussion about using NAS on Linux and Unix OS.
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Tonatiuh
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Posts: 15
Joined: Tue Jul 17, 2018 10:49 am

Reads are 50% of the speed of writes.

Post by Tonatiuh »

NAS: TVS-1282T3
QTS: 4.3.5.0728
Client OS: Ubuntu 20.04
Client HW: 2 x Xeon E5-2650 v1 - 128GB RAM
Protocol: NFS

Mounting through "/etc/fstab":
10.10.10.3:/NASFolder/ /mnt/NASFolder nfs async,_netdev 0 1

Mounting manually:
mount.nfs 10.10.10.3:/NASFolder /mnt/NASFolder -o async

* Both mounting ways gave the same results.

Testing scenario:
Copying from/to RAM-Drive (50GB) in Client machine to/from NAS Folder mounted on /mnt/NASFolder.
Testing file: A) 43 GB and B) 18 GB

Copying from NAS to RAM-Drive: 500 MB/sec
Copying from RAM-Drive to NAS: 1.0 GB/sec
Copying from NAS to NAS: 350 MB/sec
Copying from RAM-Drive to RAM-Drive: 1.8 GB/sec

I cleared caches prior to every single copy test.

NAS reads are half (or less than half) of the speed of writes. This doesn't sound neither good nor normal.

Am I missing something? Any idea about this phenomenon?

Regards,
Tonatiuh
Starting out
Posts: 15
Joined: Tue Jul 17, 2018 10:49 am

Re: Reads are 50% of the speed of writes.

Post by Tonatiuh »

Clarifying... I'm connecting Computer to NAS through 10Gbps network.

doesn't anybody have an idea of the issue?

Regards
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