I apologize in advance for my limited knowledge base with Linux, but I was hoping for some help with what I fear is a problem with one of my unRaid systems.  The unit in question was built for me by Tom, and has worked flawlessly for a couple of years.  It uses only IDE drives.  Today I noticed that it had spontaneously started a parity check, which was progressing very slowly.  I stopped the array, powered down, and restarted.  I then re initiated a parity check, which started out running usual speed, but quickly slowed to about 1500 KB/sec, much slower than usual.  So far no parity errors reported.  I viewed the syslog using instructions and the wiki, which I will attach below.  I was hoping one of the experts here could review this to see if there might be an explanation for my trouble?  Thank you in advance for any assistance.

syslog3-11-11.txt

Disk11 has had some errors communicating with the disk controller, almost as if it was using a poor quality IDE cable, or a 40 condustor one instead of an 80 conductor one.

 

Mar 11 14:12:24 TowerIDE kernel: md: import disk11: [56,64] (hdj) Maxtor 6Y250P0 Y64QKG1E size: 245117344

 

It has dropped down to PIO mode, and as a result is much slower.

 

Mar 11 14:15:54 TowerIDE kernel: hdj: dma_intr: status=0x51 { DriveReady SeekComplete Error }

Mar 11 14:15:54 TowerIDE kernel: hdj: dma_intr: error=0x84 { DriveStatusError BadCRC }

Mar 11 14:15:54 TowerIDE kernel: hdj: possibly failed opcode: 0x25

Mar 11 14:15:54 TowerIDE kernel: hdj: dma_intr: status=0x51 { DriveReady SeekComplete Error }

Mar 11 14:15:54 TowerIDE kernel: hdj: dma_intr: error=0x84 { DriveStatusError BadCRC }

Mar 11 14:15:54 TowerIDE kernel: hdj: possibly failed opcode: 0x25

Mar 11 14:15:54 TowerIDE kernel: hdi: DMA disabled

Mar 11 14:15:54 TowerIDE kernel: hdj: UDMA/100 mode selected

Mar 11 14:15:54 TowerIDE kernel: pdc202xx_new: Primary channel reset.

 

Could be as simple as a bad/loose cable.  Or a failing drive or drive controller.  Or a power supply at its limits.

 

 

Joe L.,

 

Thanks so much for the help!  I replaced disk11 and data rebuild is in progress at the expected speed.  Looks like it was a failing drive.  Is there an easier way to detect this kind of problem?

 

By the way, I post infrequently but read the forums here regularly.  You are an incredible resource for all of us using unRaid systems!