I'm seeing this message in the logs every 2 minutes:rn-expand[2065]: Failed to get device type for /dev/md0: 25I couldn't find much info on rn-expand, but it seems to relate to expanding volumes. I have a single 2TB SSD, so volume expansion shouldn't be involved. Should I be concerned? Why is this happening?

gbeddow wrote: Should I be concerned? Yes. Hopefully JohnCM_S or Marc_V will follow up. What is the disk model?

Thanks StephenB for your reply.This is a WD Red SA500 NAS 2.5" 2TB SSD.

gbeddow wrote: Thanks StephenB for your reply. This is a WD Red SA500 NAS 2.5" 2TB SSD. Thx. that might help the mods sort out what is happening.

@JohnCM_S or @Marc_V, any idea why this is happening and what can be done to resolve it?

Also noticed this in the syslog:# cat /data/rsyslog/syslog | grep rn-expand ... Jul 6 12:05:27 RN202 rn-expand[2065]: Failed to get device type for /dev/md0: 25 Jul 6 12:08:38 RN202 rn-expand[2063]: Trying auto-expand (in-place) Jul 6 12:08:38 RN202 rn-expand[2063]: Considering inplace auto-expansion for data Jul 6 12:08:38 RN202 rn-expand[2063]: Checking if RAID disk sda is expandable... Jul 6 12:08:38 RN202 rn-expand[2063]: Trying auto-extend (grow onto additional disks) Jul 6 12:08:38 RN202 rn-expand[2063]: auto_extend: Checking disk sda... Jul 6 12:08:38 RN202 rn-expand[2063]: Trying xraid-expand (tiered expansion) Jul 6 12:08:38 RN202 rn-expand[2063]: Considering X-RAID auto-expansion for data Jul 6 12:08:38 RN202 rn-expand[2063]: Checking if RAID disk sda is expandable... Jul 6 12:08:38 RN202 rn-expand[2063]: No enough disks for data-0 to expand [need 2, have 0] Jul 6 12:08:38 RN202 rn-expand[2063]: 0 disks expandable in data Jul 6 12:09:38 RN202 rn-expand[2063]: Failed to get device type for /dev/md0: 25 ...Why is it trying to "auto-expand"? There's nothing to expand AFAICT.

rn-expand[2065]: Failed to get device type for /dev/md0: 25

12 Replies

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StephenB
Guru - Experienced User
Jul 05, 2020
gbeddow wrote:

Should I be concerned?

Yes. Hopefully JohnCM_S or Marc_V will follow up.

What is the disk model?
- gbeddow
  Luminary
  Jul 05, 2020
  Thanks StephenB for your reply.
  This is a WD Red SA500 NAS 2.5" 2TB SSD.
  - StephenB
    Guru - Experienced User
    Jul 05, 2020
    gbeddow wrote:
    
    Thanks StephenB for your reply.
    
    This is a WD Red SA500 NAS 2.5" 2TB SSD.
    
    Thx. that might help the mods sort out what is happening.
Marc_V
NETGEAR Employee Retired
Jul 08, 2020
gbeddow StephenB

It seems the message is due to the NAS trying to check if it can expand on continual basis and the message may be due to the device being unknown to the system.

What make and model is your SSD drive?
- gbeddow
  Luminary
  Jul 08, 2020
  Mark_V This is a WD Red SA500 NAS 2.5" 2TB SSD.
  - gbeddow
    Luminary
    Jul 08, 2020
    @Mark_V So what needs to be done? Or are you saying it's not a concern?
Marc_V
NETGEAR Employee Retired
Jul 09, 2020
@ggbeddow

Just want to know as well if you are having issues with your NAS? This is to check if we need to investigate further.

The rn-expand queries each device on the ReadyNAS and that involves sda, sdb... and all md devices just like md0 which the message is about. rn-expand once it goes through the device lists, it tries to identify what type md0 is in this case the query cannot be completed successfully since it will not provide any info for a device type since it's a RAID device. Not really sure what should be the entry is but if you are not having any issues with the NAS I believe we can ignore those messages.

HTH
- gbeddow
  Luminary
  Jul 09, 2020
  Mark_V
  Not having any issues with the NAS AFAIK other than these messages.
  Still, a message that clutters up the logs every 2 minutes seems worth fixing. Will this be addressed in a future ReadyNAS update, or at least through apt-get?
  - gbeddow
    Luminary
    Jul 13, 2020
    @Mark_V JohnCM_S
    Bump. Haven't heard back on this.

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rn-expand[2065]: Failed to get device type for /dev/md0: 25

12 Replies

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