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Disk keeps disappearing

V

velis

Senior member
I have a ASUS P8H67-V running my file server.

I'm using 4 Samsung HD154UI drives in a RAID 5 volume. I bought 3 at first but later added the fourth. The fourth is located under the 5.25" bays whereas the original 3 are placed in their separate cage. The disks are set to turn off when not in use.

The problem I'm having is that this fourth drive started "disappearing". Like suddenly it isn't even recognised by the system any more. Intel Matrix reports it as missing and of course, the volume is degraded.

When I hard reset the computer, the drive is back as if nothing happened and the volume starts rebuilding (takes about 10 hrs 🙁 )

This happens VERY frequently, like often even before the volume is rebuilt.

tl;dr:
initially everything was fine
now one of the drives is disappearing, rate of disappearance seems to be stable. That is, it's not getting more or less frequent.
SMART says everything is peachy

I changed the SATA cable with no change in behaviour.

Is it possible that my drive is failing like this?
 
Do you hear a "clonk" noise when the drive disappears?
I had this happen to me,the PSU was faulty and one of my drives would vanish.
 
I don't know since I've never seen it vanish at the exact time. It's a server PC, not logged on all the time.
The disk in question is powered by a different PSU cable though. The original three are all powered from the same separate cable.
 
I'd run a drive health utility, not smart, and make sure that they're all healthy. If that drive shows up with lots of errors I'd replace is asap. The other thing you might try is moving it to another port.
 
SMART don't detect all errors, so, if the drive drops frequently, the issue is with that drive. RMA/return it.
 
Just an update: I had to break up the array because of this. I'm now running all 4 drives as separate volumes and the drive in question never failed since.
 
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