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I/O error

daffodil
Occasional Advisor

I/O error

hub.c: new USB device 00:1d.7-7, assigned address 7
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 7
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:11 not ready.
I/O error: dev 08:11, sector 0
Device 08:11 not ready.
I/O error: dev 08:11, sector 0
Device 08:11 not ready.
I/O error: dev 08:11, sector 0
Device 08:11 not ready.
I/O error: dev 08:11, sector 64
Device 08:11 not ready.
I/O error: dev 08:11, sector 128
Device 08:11 not ready.
I/O error: dev 08:11, sector 16
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 1953525160
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 24
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 1953525160
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 0
Device 08:10 not ready.
I/O error: dev 08:10, sector 24



/dev/sda1 /mnt/usb

Red Hat Enterprise Linux AS release 3 (Taroon Update 6)


Receiving this err message when there is a backup runs....Apparrently backup fails due to this error. Can some one tell me why the error occurs and how to fix it.

Thanks in advance!
1 REPLY
Matti_Kurkela
Honored Contributor

Re: I/O error

>hub.c: new USB device 00:1d.7-7, assigned address 7
>WARNING: USB Mass Storage data integrity not assured
>USB Mass Storage device found at 7

The first three lines are standard informational messages when plugging in a USB storage device.

The rest of the messages are I/O errors. The error messages mention two different devices: 08:10 and 08:11. These are major:minor number pairs in hexadecimal. In decimal, these are major 8 and minors 16 and 17, respectively.

Looking at "ls -l /dev/sd*", these device numbers refer to /dev/sdb and /dev/sdb1.

The line "/dev/sda1 /mnt/usb" in your post suggests /dev/sdb is not the USB storage device you expected, but something different. What is it?

A "device not ready" I/O error message indicates the device is not ready to process I/O requests. If it's a device that uses removable media, it might mean there is no disk inserted into the drive.

If the drive uses non-removable media (i.e. a regular hard disk), this might mean the drive has failed its own internal self-tests and has disabled itself.

You might try to read the health status of the disk using SMART commands:

smartctl -H /dev/sdb

or if /dev/sdb is an IDE/ATA/SATA disk within an external USB enclosure:

smartctl -d ata -H /dev/sdb

From "man smartctl":
----
If the device reports failing health status, this means either that the device has already failed, or that it is predicting its own failure within the next 24 hours. If this happens, use the â -aâ option to get more information, and get your data off the disk and someplace safe as soon as you can.
----

Once a hard disk fails, it is usually not worth the time and money to try and fix it, unless it contains irreplaceable data of high value. Just replace the disk with a new one.

Even if you manage to "fix" a disk that has failed once, you should not consider it reliable any more.

MK
MK