FW: What are descent disk I/O for Solr and Zookeeper ?

-----Original Message-----
From: Dominique Bejean [mailto:dominique.bejean@eolya.fr]
Sent: 09 March 2018 03:25
To: solr-user@lucene.apache.org
Subject: What are descent disk I/O for Solr and Zookeeper ?

Hi,

Disk I/O are critical for high performance Solrcloud.
I am looking for relevante disk I/O tests for both Solr node or Zookeeper
element and with these tests what are bad, correct or good results.

For instance how to know if these results with basic dd utility reports
correct disk performances ? And are these tests relevants ?

Write small files
# dd if=/dev/zero of=test bs=4k count=1024k conv=fdatasync
4294967296 bytes (4.3 GB) copied, 4.14932 s, 1.0 GB/s

Write medium files
# dd if=/dev/zero of=test bs=64k count=64k conv=fdatasync
4294967296 bytes (4.3 GB) copied, 3.07326 s, 1.4 GB/s

Write large files
# dd if=/dev/zero of=test bs=1024k count=4k conv=fdatasync
4294967296 bytes (4.3 GB) copied, 2.97767 s, 1.4 GB/s

Read small files
# dd if=test of=/dev/zero bs=4k
4294967296 bytes (4.3 GB) copied, 0.707424 s, 6.1 GB/s

Read medium files
# dd if=test of=/dev/zero bs=64k
4294967296 bytes (4.3 GB) copied, 0.545915 s, 7.9 GB/s

Read large files
# dd if=test of=/dev/zero bs=1024k
4294967296 bytes (4.3 GB) copied, 0.578093 s, 7.4 GB/s


Regards

Dominique



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Dominique Béjean
06 08 46 12 43