Slow write speed to Areca RAID












0















Of 10 identical machines, we now get very slow disk write speed on two machines. I don't think it is a hardware issue.



There must be a setting somewhere that is different, but I haven't found anything yet.



Any suggestions?



Good Machine



dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync

1+0 records in

1+0 records out

104857600 bytes (105 MB) copied, 0.181045 s, **579 MB/s**


Slow Machine



dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync

1+0 records in

1+0 records out

104857600 bytes (105 MB) copied, 20.3667 s, **5.1 MB/s**


Same hardware, same software.



Centos 6 32-bit

uname -a Linux 4.4.127-1.el6.elrepo.i686 #1 SMP Sun Apr 8 09:44:43 EDT 2018 i686 i686 i386 GNU/Linux


dmesg



Areca RAID Controller0: Model ARC-1882, F/W V1.52 2014-06-12

scsi host0: Areca SAS/SATA RAID Controller (RAID6 capable)

arcmsr version v1.40.0X.04-20171130





centos raid







share|improve this question



























    0















    Of 10 identical machines, we now get very slow disk write speed on two machines. I don't think it is a hardware issue.



    There must be a setting somewhere that is different, but I haven't found anything yet.



    Any suggestions?



    Good Machine



    dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
    
1+0 records in
    
1+0 records out
    
104857600 bytes (105 MB) copied, 0.181045 s, **579 MB/s**


    Slow Machine



    dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
    
1+0 records in
    
1+0 records out
    
104857600 bytes (105 MB) copied, 20.3667 s, **5.1 MB/s**


    Same hardware, same software.



    Centos 6 32-bit
    
uname -a Linux 4.4.127-1.el6.elrepo.i686 #1 SMP Sun Apr 8 09:44:43 EDT 2018 i686 i686 i386 GNU/Linux


    dmesg



    Areca RAID Controller0: Model ARC-1882, F/W V1.52 2014-06-12
    
scsi host0: Areca SAS/SATA RAID Controller (RAID6 capable)
    
arcmsr version v1.40.0X.04-20171130





    centos raid







    share|improve this question

























      0












      0








      0








      Of 10 identical machines, we now get very slow disk write speed on two machines. I don't think it is a hardware issue.



      There must be a setting somewhere that is different, but I haven't found anything yet.



      Any suggestions?



      Good Machine



      dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
      
1+0 records in
      
1+0 records out
      
104857600 bytes (105 MB) copied, 0.181045 s, **579 MB/s**


      Slow Machine



      dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
      
1+0 records in
      
1+0 records out
      
104857600 bytes (105 MB) copied, 20.3667 s, **5.1 MB/s**


      Same hardware, same software.



      Centos 6 32-bit
      
uname -a Linux 4.4.127-1.el6.elrepo.i686 #1 SMP Sun Apr 8 09:44:43 EDT 2018 i686 i686 i386 GNU/Linux


      dmesg



      Areca RAID Controller0: Model ARC-1882, F/W V1.52 2014-06-12
      
scsi host0: Areca SAS/SATA RAID Controller (RAID6 capable)
      
arcmsr version v1.40.0X.04-20171130





      centos raid







      share|improve this question














      Of 10 identical machines, we now get very slow disk write speed on two machines. I don't think it is a hardware issue.



      There must be a setting somewhere that is different, but I haven't found anything yet.



      Any suggestions?



      Good Machine



      dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
      
1+0 records in
      
1+0 records out
      
104857600 bytes (105 MB) copied, 0.181045 s, **579 MB/s**


      Slow Machine



      dd if=/dev/zero of=/mnt/das.h/testFile bs=100M count=1 oflag=dsync
      
1+0 records in
      
1+0 records out
      
104857600 bytes (105 MB) copied, 20.3667 s, **5.1 MB/s**


      Same hardware, same software.



      Centos 6 32-bit
      
uname -a Linux 4.4.127-1.el6.elrepo.i686 #1 SMP Sun Apr 8 09:44:43 EDT 2018 i686 i686 i386 GNU/Linux


      dmesg



      Areca RAID Controller0: Model ARC-1882, F/W V1.52 2014-06-12
      
scsi host0: Areca SAS/SATA RAID Controller (RAID6 capable)
      
arcmsr version v1.40.0X.04-20171130





      centos raid




      centos raid






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 16 mins ago









      DannyDanny

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