SCSI disk error

humbletech99 · 04-24-2006, 10:08 AM

I've got a box with an adaptec aic7899 and another aic7902 scsi card.

I've got the following in my logs:

Code:

kernel: SCSI error : <2 0 0 0> return code = 0x10000
Apr 24 14:12:35 kernel: end_request: I/O error, dev sdn, sector 8
Apr 24 14:12:35 kernel: Buffer I/O error on device sdn, logical block
1

Does this mean my disk is faulty? Apart from cable, scsi adapter is there anything else it could be? driver?

When I do fdisk -l /dev/hdn my term hangs and I can't get it back.... this happens for everything from hdn-hds...

Wells · 04-24-2006, 11:44 AM

It could be the disk. It could also be the cable or scsi adapter. For that matter, if this is an internal drive, it could also be a terminator, or the absense of one.

marozsas · 04-25-2006, 07:29 AM

You may check the disk with the command "fsck -cc /dev/sdnm".
You can use "badblock -sn -b block-size -o bad-blocks-file /dev/sdnm" too, in this case you just need to pay attention to the block-size parameter to match with the block-size used by the filesystem.

humbletech99 · 04-25-2006, 12:29 PM

it was the stupid disk, I have had to change at least a dozen scsi disks in the last 5 months (probably closer to 2 dozen). I hate scsi! gimme reliability!

at least it seems to be working now.

Wells · 04-26-2006, 09:47 AM

You know, if you are having that many problems with SCSI disks, you might want to start looking somewhere else for where the problem is. Mounting or bad power are possible causes for drives going bad like that.

If your drives are being powered off of a system power supply, you may want to take a look at the power rating for that power supply and see if it is rated for handling the load you are putting on it. I have seen all kinds of problems caused by bad power supplies. Also, if you are in an area that is prone to power surges or brownouts, you may want to think about putting the system on a UPS. Brownouts are even more devastating that power surges, because the lower voltage means that the system starts demanding more and more current to handle the load, which then tends to burn things up. Remember, it isn't usually voltage that burns out a system... it is a high current situation.

humbletech99 · 04-27-2006, 05:02 AM

thanks, I'll check it out, I've had problems before that were down to bad power supplies, but what I want to know is how to calculate the amount of watts i need in a power supply, i haven't seen anywhere telling me how many watts a hard drive uses etc...