new /dev/sd* device gets created at startup

msound · 09-08-2008, 03:07 PM

We have a server running CentOS 4.6 with an internal raid array, the hard drives of that array are /dev/sda and /dev/sdb. We also have a pci fiber channel card which hooks up to a SAN. The san partition is /dev/sdc

Here is the output from fdisk:

Code:

fdisk -l

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       30401   244091610   83  Linux

Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1         254     2040223+  82  Linux swap

Disk /dev/sdc: 1610.6 GB, 1610612736000 bytes
255 heads, 63 sectors/track, 195812 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1      195812  1572859858+  83  Linux

My issue is I keep getting disk I/O errors for disk /dev/sdd
Here are a few lines from dmesg:

Code:

SCSI device sdd: 3145728000 512-byte hdwr sectors (1610613 MB)
sdd: asking for cache data failed
sdd: assuming drive cache: write through
SCSI device sdd: 3145728000 512-byte hdwr sectors (1610613 MB)
sdd: asking for cache data failed
sdd: assuming drive cache: write through
 sdd:<6>Device sdd not ready.
end_request: I/O error, dev sdd, sector 0
Buffer I/O error on device sdd, logical block 0

My /etc/fstab does not list a /dev/sdd... but if I do an ls on /dev there is a single /dev/sdd device. If I rm /dev/sdd it'll re-appear after a reboot. If a try to fdisk /dev/sdd I get the following message:

Code:

fdisk /dev/sdd 

Unable to read /dev/sdd

I have no idea what's going on. Somewhere there's gotta be a line that says /dev/sdd is a valid partition but I have no idea where to look. Any help/ideas would be much appreciated.

Thanks!

CRC123 · 09-08-2008, 03:57 PM

Any tape devices, cdrom's, etc connected through scsi or sata? lots of times cdrom or dvd show up as hd.. or sd.. etc.

msound · 09-08-2008, 04:11 PM

The cdrom is connected via IDE and is assigned /dev/hda. Here's my /etc/fstab:

Code:

# This file is edited by fstab-sync - see 'man fstab-sync' for details
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /dev/shm                tmpfs   defaults        0 0
none                    /proc                   proc    defaults        0 0
none                    /sys                    sysfs   defaults        0 0
LABEL=SWAP-sdb1         swap                    swap    defaults        0 0
/dev/sdc1               /exports/mounts/archive ext3    defaults        1 1
/dev/hda                /media/cdrom            auto    pamconsole,fscontext=system_u:object_r:removable_t,exec,noauto,managed 0 0

farslayer · 09-09-2008, 09:25 AM

anything in the dmesg log after booting that would indicate what is being detected as sdd ?

cat /var/log/dmesg | grep sdd