File IO very slow on RHEL6












0















I recently moved to RHEL6 santaigo OS. I am finding the file io operations like copy, file download taking a long time. This was not the case when I have used RHEL5 earlier. Could anyone suggest a possible way to troubleshoot the issue. The file system has two mounted devices.




  1. /dev/mapper/***

  2. /dev/sda1


Both are ext4 type.






rhel







share|improve this question


















  • 1





    Check dmesg for any error messages related to the filesystem or partition devices.

    – Shadur
    Feb 7 '14 at 9:21
















0















I recently moved to RHEL6 santaigo OS. I am finding the file io operations like copy, file download taking a long time. This was not the case when I have used RHEL5 earlier. Could anyone suggest a possible way to troubleshoot the issue. The file system has two mounted devices.




  1. /dev/mapper/***

  2. /dev/sda1


Both are ext4 type.






rhel







share|improve this question


















  • 1





    Check dmesg for any error messages related to the filesystem or partition devices.

    – Shadur
    Feb 7 '14 at 9:21














0












0








0








I recently moved to RHEL6 santaigo OS. I am finding the file io operations like copy, file download taking a long time. This was not the case when I have used RHEL5 earlier. Could anyone suggest a possible way to troubleshoot the issue. The file system has two mounted devices.




  1. /dev/mapper/***

  2. /dev/sda1


Both are ext4 type.






rhel







share|improve this question














I recently moved to RHEL6 santaigo OS. I am finding the file io operations like copy, file download taking a long time. This was not the case when I have used RHEL5 earlier. Could anyone suggest a possible way to troubleshoot the issue. The file system has two mounted devices.




  1. /dev/mapper/***

  2. /dev/sda1


Both are ext4 type.






rhel




rhel






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Feb 7 '14 at 9:01









Gaurav AbbiGaurav Abbi

1011




1011








  • 1





    Check dmesg for any error messages related to the filesystem or partition devices.

    – Shadur
    Feb 7 '14 at 9:21














  • 1





    Check dmesg for any error messages related to the filesystem or partition devices.

    – Shadur
    Feb 7 '14 at 9:21








1




1





Check dmesg for any error messages related to the filesystem or partition devices.

– Shadur
Feb 7 '14 at 9:21





Check dmesg for any error messages related to the filesystem or partition devices.

– Shadur
Feb 7 '14 at 9:21










1 Answer
1






active

oldest

votes


















0














I typically use strace, at least initially to start diagnosing an issue such as this.



$ strace -o some.log ..copy command...


You can then analyze the log, some.log to see if the copy command is getting hung up on a particular resource not being there.



You can also use a tool such as iostat to watch the performance between your storage devices as data is read/wrtiten to them.



Example



$ iostat 2

avg-cpu:  %user   %nice %system %iowait  %steal   %idle

          23.46    0.00    2.26    1.38    0.00   72.90



Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn

sda               6.50         0.00       220.00          0        440

dm-0              0.00         0.00         0.00          0          0

dm-1              3.00         0.00        10.00          0         20

dm-2             16.00         0.00       210.00          0        420

dm-3              0.00         0.00         0.00          0          0

dm-4              0.00         0.00         0.00          0          0

dm-5              0.00         0.00         0.00          0          0

dm-6              0.00         0.00         0.00          0          0

dm-7              0.00         0.00         0.00          0          0

dm-8              0.00         0.00         0.00          0          0

dm-9              0.00         0.00         0.00          0          0

dm-10             0.00         0.00         0.00          0          0


You can narrow the focus of that tool to a specific device as well.






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    I typically use strace, at least initially to start diagnosing an issue such as this.



    $ strace -o some.log ..copy command...


    You can then analyze the log, some.log to see if the copy command is getting hung up on a particular resource not being there.



    You can also use a tool such as iostat to watch the performance between your storage devices as data is read/wrtiten to them.



    Example



    $ iostat 2
    
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
    
          23.46    0.00    2.26    1.38    0.00   72.90
    

    
Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
    
sda               6.50         0.00       220.00          0        440
    
dm-0              0.00         0.00         0.00          0          0
    
dm-1              3.00         0.00        10.00          0         20
    
dm-2             16.00         0.00       210.00          0        420
    
dm-3              0.00         0.00         0.00          0          0
    
dm-4              0.00         0.00         0.00          0          0
    
dm-5              0.00         0.00         0.00          0          0
    
dm-6              0.00         0.00         0.00          0          0
    
dm-7              0.00         0.00         0.00          0          0
    
dm-8              0.00         0.00         0.00          0          0
    
dm-9              0.00         0.00         0.00          0          0
    
dm-10             0.00         0.00         0.00          0          0


    You can narrow the focus of that tool to a specific device as well.






    share|improve this answer




























      0














      I typically use strace, at least initially to start diagnosing an issue such as this.



      $ strace -o some.log ..copy command...


      You can then analyze the log, some.log to see if the copy command is getting hung up on a particular resource not being there.



      You can also use a tool such as iostat to watch the performance between your storage devices as data is read/wrtiten to them.



      Example



      $ iostat 2
      
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
      
          23.46    0.00    2.26    1.38    0.00   72.90
      

      
Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
      
sda               6.50         0.00       220.00          0        440
      
dm-0              0.00         0.00         0.00          0          0
      
dm-1              3.00         0.00        10.00          0         20
      
dm-2             16.00         0.00       210.00          0        420
      
dm-3              0.00         0.00         0.00          0          0
      
dm-4              0.00         0.00         0.00          0          0
      
dm-5              0.00         0.00         0.00          0          0
      
dm-6              0.00         0.00         0.00          0          0
      
dm-7              0.00         0.00         0.00          0          0
      
dm-8              0.00         0.00         0.00          0          0
      
dm-9              0.00         0.00         0.00          0          0
      
dm-10             0.00         0.00         0.00          0          0


      You can narrow the focus of that tool to a specific device as well.






      share|improve this answer


























        0












        0








        0







        I typically use strace, at least initially to start diagnosing an issue such as this.



        $ strace -o some.log ..copy command...


        You can then analyze the log, some.log to see if the copy command is getting hung up on a particular resource not being there.



        You can also use a tool such as iostat to watch the performance between your storage devices as data is read/wrtiten to them.



        Example



        $ iostat 2
        
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
        
          23.46    0.00    2.26    1.38    0.00   72.90
        

        
Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
        
sda               6.50         0.00       220.00          0        440
        
dm-0              0.00         0.00         0.00          0          0
        
dm-1              3.00         0.00        10.00          0         20
        
dm-2             16.00         0.00       210.00          0        420
        
dm-3              0.00         0.00         0.00          0          0
        
dm-4              0.00         0.00         0.00          0          0
        
dm-5              0.00         0.00         0.00          0          0
        
dm-6              0.00         0.00         0.00          0          0
        
dm-7              0.00         0.00         0.00          0          0
        
dm-8              0.00         0.00         0.00          0          0
        
dm-9              0.00         0.00         0.00          0          0
        
dm-10             0.00         0.00         0.00          0          0


        You can narrow the focus of that tool to a specific device as well.






        share|improve this answer













        I typically use strace, at least initially to start diagnosing an issue such as this.



        $ strace -o some.log ..copy command...


        You can then analyze the log, some.log to see if the copy command is getting hung up on a particular resource not being there.



        You can also use a tool such as iostat to watch the performance between your storage devices as data is read/wrtiten to them.



        Example



        $ iostat 2
        
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
        
          23.46    0.00    2.26    1.38    0.00   72.90
        

        
Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
        
sda               6.50         0.00       220.00          0        440
        
dm-0              0.00         0.00         0.00          0          0
        
dm-1              3.00         0.00        10.00          0         20
        
dm-2             16.00         0.00       210.00          0        420
        
dm-3              0.00         0.00         0.00          0          0
        
dm-4              0.00         0.00         0.00          0          0
        
dm-5              0.00         0.00         0.00          0          0
        
dm-6              0.00         0.00         0.00          0          0
        
dm-7              0.00         0.00         0.00          0          0
        
dm-8              0.00         0.00         0.00          0          0
        
dm-9              0.00         0.00         0.00          0          0
        
dm-10             0.00         0.00         0.00          0          0


        You can narrow the focus of that tool to a specific device as well.







        share|improve this answer












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        answered Feb 7 '14 at 9:16









        slm♦slm

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