NAS542 Raid 5 - Hot Spare labeled as "not supported"

AdLo
AdLo Posts: 4 image  Freshman Member
First Comment
in Personal Cloud Storage

Hey there,

I am currently using a NAS 542 with 4 drives in RAID 5. While checking my hdd health I stumbled across a small notification in my Storage Manager stating Hot Spare is not supported.

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I chose RAID 5 because in case one drive dies I can just replace it and retrieve my data from the other 3 working hdds. Is this the case with my current configuration or do I have to change it?

Thank you!

Accepted Solution

  • Mijzelf
    Mijzelf Posts: 2,978 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
    Answer ✓

    OK, to anwer your previous question

    I chose RAID 5 because in case one drive dies I can just replace it and retrieve my data from the other 3 working hdds. Is this the case with my current configuration or do I have to change it?

    You running a 4 disk raid5 array, and all members are up:

    md2 : active raid5 sdc3[0] sdd3[3] sda3[2] sdb3[1]

    8778405312 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

    The roles are a bit strange (have you shuffled the disks after creating the array?) but that doesn't obstruct functionality. Your array is safe for failure of a single disk.

    Don't know where the 'not supported' message came from. Not from mdstat.

All Replies

  • Mijzelf
    Mijzelf Posts: 2,978 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary

    AFAIK the web backend reads this information from the (pseudo-)file /proc/mdstat. To know where this comes from look at the orginal.

    Enable the ssh server, login over ssh and execute

    cat /proc/mdstat

  • AdLo
    AdLo Posts: 4 image  Freshman Member
    First Comment

    Hey,

    Thank you for your reply. mdstat outputs the following:

    Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]

    md2 : active raid5 sdc3[0] sdd3[3] sda3[2] sdb3[1]
    8778405312 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]


    md1 : active raid1 sdc2[0] sdd2[5] sda2[4] sdb2[1]
    1998784 blocks super 1.2 [4/4] [UUUU]


    md0 : active raid1 sdc1[0] sdd1[5] sda1[4] sdb1[1]
    1997760 blocks super 1.2 [4/4] [UUUU]


    unused devices: <none>

  • Mijzelf
    Mijzelf Posts: 2,978 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
    Answer ✓

    OK, to anwer your previous question

    I chose RAID 5 because in case one drive dies I can just replace it and retrieve my data from the other 3 working hdds. Is this the case with my current configuration or do I have to change it?

    You running a 4 disk raid5 array, and all members are up:

    md2 : active raid5 sdc3[0] sdd3[3] sda3[2] sdb3[1]

    8778405312 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

    The roles are a bit strange (have you shuffled the disks after creating the array?) but that doesn't obstruct functionality. Your array is safe for failure of a single disk.

    Don't know where the 'not supported' message came from. Not from mdstat.

  • AdLo
    AdLo Posts: 4 image  Freshman Member
    First Comment

    Thanks for checking Mijzelf.

    I recently cleaned the NAS but paid attention to not mess up the order of the HDDs. As long as it doesn't mess something up I'm fine with it.

    Thanks again.

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