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MySQL on VM, High IO Wait but low TPS

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2

We are trying to figure out a strange situation on our MySQL installation on VM. We are on Mysql 5.7 and RHEL 7 with XFS.

We are observing when we run a few select queries the IOWait races up to 40-50% while we see the Disk Read speeds dont cross 25-30 MBps.

We checked at OS level but we are easily getting 500-600 MBps when we try to do a file copy and other Disk Read and Write speed tests.(So we assume its not a disk IO bottleneck)

IOPS shows over 20,000 and averaging at 9-10,000.

We are trying to figure out what might be causing disk IO Wait while we have sufficiently fast Disks and enough CPU to spare.

Any insight on where to look would be greatly appreciated.

mysql redhat virtual-machines innodb iowait

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asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

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Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need to isolate the issue. Examine query plans with EXPLAIN. Run mysqlbench. Benchmark the storage subsystem with iozone.
  
  – Mark Wagner
  Apr 4 at 16:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please post TEXT results of SHOW GLOBAL VARIABLES LIKE 'innodb_io%'; and SHOW GLOBAL VARIABLES LIKE %thread%; and SHOW GLOBAL STATUS LIKE %thread%; and EXPLAIN SELECT ...... (for one of your slow queries), when time permits.
  
  – Wilson Hauck
  yesterday
  

  
  
  
  

add a comment | 

2

We are trying to figure out a strange situation on our MySQL installation on VM. We are on Mysql 5.7 and RHEL 7 with XFS.

We are observing when we run a few select queries the IOWait races up to 40-50% while we see the Disk Read speeds dont cross 25-30 MBps.

We checked at OS level but we are easily getting 500-600 MBps when we try to do a file copy and other Disk Read and Write speed tests.(So we assume its not a disk IO bottleneck)

IOPS shows over 20,000 and averaging at 9-10,000.

We are trying to figure out what might be causing disk IO Wait while we have sufficiently fast Disks and enough CPU to spare.

Any insight on where to look would be greatly appreciated.

mysql redhat virtual-machines innodb iowait

share|improve this question

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

New contributor

Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need to isolate the issue. Examine query plans with EXPLAIN. Run mysqlbench. Benchmark the storage subsystem with iozone.
  
  – Mark Wagner
  Apr 4 at 16:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please post TEXT results of SHOW GLOBAL VARIABLES LIKE 'innodb_io%'; and SHOW GLOBAL VARIABLES LIKE %thread%; and SHOW GLOBAL STATUS LIKE %thread%; and EXPLAIN SELECT ...... (for one of your slow queries), when time permits.
  
  – Wilson Hauck
  yesterday
  

  
  
  
  

add a comment | 

We are trying to figure out a strange situation on our MySQL installation on VM. We are on Mysql 5.7 and RHEL 7 with XFS.

We are observing when we run a few select queries the IOWait races up to 40-50% while we see the Disk Read speeds dont cross 25-30 MBps.

We checked at OS level but we are easily getting 500-600 MBps when we try to do a file copy and other Disk Read and Write speed tests.(So we assume its not a disk IO bottleneck)

IOPS shows over 20,000 and averaging at 9-10,000.

We are trying to figure out what might be causing disk IO Wait while we have sufficiently fast Disks and enough CPU to spare.

Any insight on where to look would be greatly appreciated.

mysql redhat virtual-machines innodb iowait

share|improve this question

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

New contributor

Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

New contributor

Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

New contributor

Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112

New contributor

Kiran Thummalapalli is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 4 at 12:22

Kiran ThummalapalliKiran Thummalapalli

112