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A single server has lower throughput in a cluster on the same volume

A single server has lower throughput in a cluster on the same volume

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Views:: 49

Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

All versions of ONTAP or Data ONTAP

Issue

A single server in a cluster, such as a hypervisor of an ESX cluster, or SQL server, experiences slower throughput running the same workload, and ONTAP doesn't show an issue with latency.
Example: Running dd gets worse throughput on the poor performing server1 compared to server2:

server1:~# dd if=/dev/zero of=/mnt1/path1/testfilegk bs=1G count=1 oflag=dsync
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 20.047 s, 53.6 MB/s

server2:~# dd if=/dev/zero of=/mnt1/path1/testfilegk bs=1G count=1 oflag=dsync
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.554 s, 420 MB/s