NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.

Forum Discussion

jlficken's avatar
jlficken
Aspirant
Oct 16, 2019
Solved

4 disk RAID 10 array....how do I tell which disks are striped?

I'm trying to figure out which disks are paired together as I'm moving data to another system and am going to canabalize the array for now.

 

Everything is backed up so if something happens I'll be okay.

 

How do I know which 2 disks I can remove?

 

The top 4 bays are populated with the drives in this volume.

  • StephenB's avatar
    StephenB
    Oct 17, 2019
    jlficken wrote: 
        Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync set-A   /dev/sda3
       -       0        0        1      removed
       2       8       35        2      active sync set-A   /dev/sdc3
       3       8       51        3      active sync set-B   /dev/sdd3

    Would it seem logical that I can remove either disk 0 or disk 2 safely?

    Yes, that is the case.  It looks like you already removed disk sdb (bay 2)  - which was mirrored by sdd (bay 4).

6 Replies

Replies have been turned off for this discussion
  • StephenB's avatar
    StephenB
    Guru - Experienced User
    Oct 17, 2019

    I've never used RAID 10, so I'm not 100% sure.  But perhaps download the log zip file, and look at mdstat.log.

    • jlficken's avatar
      jlficken
      Aspirant
      Oct 17, 2019

      Thanks!!!

       

      I see this in that file:

      Consistency Policy : unknown

              Name : 7c6e3906:MAIN-0  (local to host 7c6e3906)
              UUID : fd0716df:099c5648:d351a440:b82e32f5
            Events : 13588

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync set-A   /dev/sda3
       -       0        0        1      removed
       2       8       35        2      active sync set-A   /dev/sdc3
       3       8       51        3      active sync set-B   /dev/sdd3

      Would it seem logical that I can remove either disk 0 or disk 2 safely?

      • jlficken's avatar
        jlficken
        Aspirant
        Oct 17, 2019

        Here's the full contents for that volume:

        /dev/md/MAIN-0:
           Version : 1.2
     Creation Time : Sat Mar 18 15:51:34 2017
        Raid Level : raid10
        Array Size : 15618353664 (14894.82 GiB 15993.19 GB)
     Used Dev Size : 7809176832 (7447.41 GiB 7996.60 GB)
      Raid Devices : 4
     Total Devices : 4
       Persistence : Superblock is persistent

       Update Time : Thu Oct 17 12:35:48 2019
             State : clean, degraded 
    Active Devices : 3
   Working Devices : 3
    Failed Devices : 1
     Spare Devices : 0

            Layout : near=2
        Chunk Size : 64K

Consistency Policy : unknown

              Name : 7c6e3906:MAIN-0  (local to host 7c6e3906)
              UUID : fd0716df:099c5648:d351a440:b82e32f5
            Events : 13588

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync set-A   /dev/sda3
       -       0        0        1      removed
       2       8       35        2      active sync set-A   /dev/sdc3
       3       8       51        3      active sync set-B   /dev/sdd3

       1       8       19        -      faulty

NETGEAR Academy

Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology! 

Join Us!

ProSupport for Business

Comprehensive support plans for maximum network uptime and business peace of mind.

 

Learn More