Highly non-optimally tuned ΔV3 on a simple streaming test

Yowza …

[root@dv3-of coreutils-7.2]# /opt/scalable/bin/dd if=/mnt/data/filesys1/xfs/t/big.file of=/dev/null bs=16M iflag=direct
807+0 records in
807+0 records out
13539213312 bytes (14 GB) copied, 13.2268 s, 1.0 GB/s

Unit has 8 GB ram.

Streaming writes are a bit slower (and direct IO not nearly as efficient for this RAID6).

[root@dv3-of coreutils-7.2]# /opt/scalable/bin/dd if=/dev/zero of=/mnt/data/filesys1/xfs/t/big.file bs=16M count=2k 
2048+0 records in
2048+0 records out
34359738368 bytes (34 GB) copied, 82.3577 s, 417 MB/s

For laughs, lets re-read that 34 GB I just wrote out.

[root@dv3-of coreutils-7.2]# /opt/scalable/bin/dd if=/mnt/data/filesys1/xfs/t/big.file of=/dev/null bs=16M iflag=direct
2048+0 records in
2048+0 records out
34359738368 bytes (34 GB) copied, 33.9782 s, 1.0 GB/s

Yuppers. Not a bad little box. Imagine if we were running our tuned kernel and distribution on it 🙂

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4 thoughts on “Highly non-optimally tuned ΔV3 on a simple streaming test

  1. 16 drives, 1 hot spare and 15 data drives. 13 active drives in RAID6, 2 parity drives.

    This is an untuned config for a partner requesting a specific test load.

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