Hi,

Having some problems with one of our production systems,
sadly i was around when this system was installed in 2005 and i havent figured out the complete setup, but this is what problems i get.

[root@app1 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
df: `DEVNO="0x0801"': No such file or directory
df: `DEVNO="0x0811"': No such file or directory
df: `DEVNO="0x0812"': No such file or directory
df: `DEVNO="0x0900"': No such file or directory
/dev/shm 1037348 0 1037348 0% /dev/shm
[root@app1 ~]#

This dosnt look very good, i then look in the /etc/mtab file
in this is what it shows.

[root@app1 ~]# cat /etc/mtab
<device DEVNO="0x0801" TIME="1123068626" UUID="54dd4b36-cb5e-411a-aced-ad16b056a62e" SEC_TYPE="ext2" TYPE="ext3">/dev/sda1</device>
<device DEVNO="0x0811" TIME="1123068626" UUID="54dd4b36-cb5e-411a-aced-ad16b056a62e" SEC_TYPE="ext2" TYPE="ext3">/dev/sdb1</device>
<device DEVNO="0x0812" TIME="1185408985" TYPE="swap" LABEL="SWAP-sdb2" UUID="0f564e5e-ca16-4b55-ac08-90b5956d94d6">/dev/sdb2</device>
<device DEVNO="0x0900" TIME="1123068626" PRI="10" UUID="54dd4b36-cb5e-411a-aced-ad16b056a62e" SEC_TYPE="ext2" TYPE="ext3">/dev/md0</device>
/dev/shm /dev/shm tmpfs rw 0 0
[root@app1 ~]#

I have no idea why its looking like that, but it havent always that im sure of.

and just running "mount" gives me this.

[root@app1 ~]# mount
[mntent]: line 1 in /etc/mtab is bad
[mntent]: line 2 in /etc/mtab is bad
[mntent]: line 3 in /etc/mtab is bad
[mntent]: line 4 in /etc/mtab is bad
/dev/shm on /dev/shm type tmpfs (rw)
[root@app1 ~]#

I think the server is running a raid1 with the help of mdadm

/dev/md0 is mounted as / . that i know

running mdadm --details /dev/md0 gives me this

[root@app1 ~]# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Wed Aug 3 12:55:39 2005
Raid Level : raid1
Array Size : 155195776 (148.01 GiB 158.92 GB)
Device Size : 155195776 (148.01 GiB 158.92 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Mon Nov 19 21:39:15 2007
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

UUID : 85381074:35361abd:4a206657:2bc85785
Events : 0.37174389

Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 - removed
[root@app1 ~]#

One of the discs is broken that i know, and it has been removed from the raidsetup as you can see above until i can replace it, though should this have any affect that i cant do a "df" on the system ?

I appreciate any intell on this,

Kind regards, Jonas

Do you know what raid level it is set at or did I miss it in the test above?

Hi,
as --details output from above its raidlevel 1, though i fixed this by rebooting the system. But i have still no idea what caused the problem,
but after the reboot it worked, the mtab file was looking good and df was working without a problem. But it was a nervous couple of mins when i rebooted the system remote. Still would be nice if some1 actually knew why or how this was caused.

I have worked with production raid systems and they have done some strange things as in not being found upon boot up and having to power down the system to 'reseat' a drive and it worked just fine.


I would do the mdadm --display command and verify everything is working ok, and physically check out the machine maybe one of the drives is not seated correctly or loose. Just a starting point to rule out a lot of variables, otherwise it is a needle in a haystack type of deal.