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Full Discussion: How to test RAID10 array performance [Debian Wheezy]?
Top Forums UNIX for Advanced & Expert Users How to test RAID10 array performance [Debian Wheezy]? Post 302918579 by gacanepa on Wednesday 24th of September 2014 09:37:29 AM
Old 09-24-2014
Quote:
Originally Posted by gull04
Hi Gacanepa,

You don't really provide enough information about the actual makeup of the disks, what is the actual backend you are using as this can make a significant difference. How are the devices accessed - there are a shedload more questions on this front.

In general and it is a generalisation the RAID10 (striped then mirrored) should provide the better performance (true also for RAID01) than RAID1. But it is not really possible to comment further than that without knowing a bit more information about your setup.

Regards

Dave
Dave,

First off, thank you for taking the time to reply to my post. Here are some other details that I hope will be helpful (if there is any other backend information that you need, please let me know):

-Both RAID arrays (1 & 10) were created in the same system.

-uname -a:
Code:
Linux debian 3.2.0-4-486 #1 Debian 3.2.60-1+deb7u3 i686 GNU/Linux

-From lshw:
Code:
     *-memory
          description: System memory
          physical id: 1
          size: 502MiB
     *-cpu
          product: AMD Athlon(tm) II X2 250 Processor
          vendor: Advanced Micro Devices [AMD]
          physical id: 2
          bus info: cpu@0
          version: 15.6.3
          size: 3GHz
          width: 32 bits

-mdadm --detail /dev/md0:
Code:
/dev/md0:
        Version : 1.2
  Creation Time : Wed Sep 24 10:02:18 2014
     Raid Level : raid10
     Array Size : 16764928 (15.99 GiB 17.17 GB)
  Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
   Raid Devices : 4
  Total Devices : 5
    Persistence : Superblock is persistent

    Update Time : Wed Sep 24 10:04:56 2014
          State : active 
 Active Devices : 4
Working Devices : 5
 Failed Devices : 0
  Spare Devices : 1

         Layout : far=2
     Chunk Size : 512K

           Name : debian:0  (local to host debian)
           UUID : 36b8594f:e14b8caf:df8dedff:99320083
         Events : 18

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1
       2       8       49        2      active sync   /dev/sdd1
       3       8       65        3      active sync   /dev/sde1

       4       8       81        -      spare   /dev/sdf1

-mdadm --detail /dev/md1:
Code:
/dev/md1:
        Version : 1.2
  Creation Time : Wed Sep 24 10:07:57 2014
     Raid Level : raid1
     Array Size : 16767872 (15.99 GiB 17.17 GB)
  Used Dev Size : 16767872 (15.99 GiB 17.17 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Wed Sep 24 10:14:22 2014
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : debian:1  (local to host debian)
           UUID : 98144751:72e778b7:dc92a91c:fffbfb43
         Events : 17

    Number   Major   Minor   RaidDevice State
       0       8       97        0      active sync   /dev/sdg1
       1       8      113        1      active sync   /dev/sdh1

 

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