Device is Disabled...

[gideva]

Hi Guys,

 

got a disabled disk a couple of days ago and I dowloaded the diagnostic.

Can you be so kind yo take a look at it?

Thanks

[itimpi]

If you want anyone to look at your diagnostics you will actually have to attach them to a post  

[gideva]

Ahahahahahaha.... Sorry!

monstruo-diagnostics-20210511-0844.zip

[JorgeB]

Do you have notifications enable?

 

There were multiple disks with read errors:
 

May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062760
May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062768
May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062776
...
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559224
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559232
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559240

 

and then disk9, disk4 and disk15 look more like a connection/power issue, replace cables but also run an extended SMART test on disk15 since it's showing some issues.

 

As for disk9 it dropped offline, so there's no SMART, check/replace cables and post new diags.

[gideva]

Ok I will check but I replaced all cables with high quality ones few months ago for the same issue so I am thinking that it might be related to something else?

[JorgeB]

Most likely bad cables or bad power.

[ChatNoir]

You should also look into this :

6 hours ago, JorgeB said:

Do you have notifications enable?

 

Seems that the errors happened over several days. The sooner you take action after errors, the better.

[gideva]

17 hours ago, JorgeB said:

Do you have notifications enable?

 

There were multiple disks with read errors:
 

May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062760
May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062768
May  1 16:53:20 Monstruo kernel: md: disk4 read error, sector=6445062776
...
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559224
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559232
May  2 01:52:39 Monstruo kernel: md: disk15 read error, sector=588559240

 

and then disk9, disk4 and disk15 look more like a connection/power issue, replace cables but also run an extended SMART test on disk15 since it's showing some issues.

 

As for disk9 it dropped offline, so there's no SMART, check/replace cables and post new diags.

Just to be super sure on what I have to do...

 

I checked the cables and they all seems ok... Now what?

Sorry for the stupid question but every time I make a mess :-(...

[JorgeB]

Try replacing the cables or use a different PSU.

[gideva]

I mean….

 

“As for disk9 it dropped offline, so there's no SMART, check/replace cables and post new diags.“

 

How should I proceed???

 

I checked the cables and all fine… now how I can put the drive back on??

[itimpi]

This is covered here  in the online documentation that can be accessed via the Manual link at the bottom of the Unraid GUI.

 

It is up to you whether you use the option to rebuild to a spare drive (safest) or the one to rebuild the disk to itself.

 

[JorgeB]

1 hour ago, gideva said:

How should I proceed???

When the drive is back online post new diags.

[gideva]

Here it is...

 

One more thing: is it advisable to add a second parity disk?

 

 

Thanks

monstruo-diagnostics-20210516-2041.zip

[JorgeB]

SMART looks fine so likely also a power/connection issue.

[itimpi]

22 hours ago, gideva said:

One more thing: is it advisable to add a second parity disk?

 

This is really a decision you have to make for yourself on a cost/benefit/risk basis.  Adding a second parity protects against having 2 simultaneous dish failures, but if you have a good backup strategy you may decide the benefits do not outweigh the cost.  It is always worth remembering that extra parity is about high availability and is not a guarantee against data loss so anything important should always be backed up elsewhere.

[gideva]

56 minutes ago, itimpi said:

 

This is really a decision you have to make for yourself on a cost/benefit/risk basis.  Adding a second parity protects against having 2 simultaneous dish failures, but if you have a good backup strategy you may decide the benefits do not outweigh the cost.  It is always worth remembering that extra parity is about high availability and is not a guarantee against data loss so anything important should always be backed up elsewhere.

Crystal clear.... Thanks for your always valuable advices!