end_request I/O error

Harald_Jensas at Dell.com Harald_Jensas at Dell.com
Sat Dec 15 07:58:52 CST 2007 

Hi,

 

I am sure the devices logging the errors are the device for a path to the SAN SP that currently is not owning the LUN. E.g you have the errors for sdb, then sdc and sdd is ok, then you have the errors for sde again. Since the SAN is active/passive only 2 paths can be used, the other two paths are in standby mode. E.g These messages logged at boot up may be ignored.

 

 

I see you also found that LVM is confused because you have 4 paths to the same LUN, thus it reports 4 duplicates for each LUN.

 

You should look at the PowerPath Installation Guide, specifically the “configuring LVM2 support” section.

 

You want to configure LVM not to scan, filter out, the sd devices that is a path to the SAN LUN. 

You must modify the /etc/lvm/lvm.conf file so that LVM2 recognizes a PowerPath pseudo device as the single path to LUN.

 

Example for RHEL 4 U4 and RHEL 5 if / (root) file system not mounted on a LVM volume. 

filter = [ "r/sd.*/", "r/disk.*/", "a/.*/" ]

 

If / (root) file system is mounted on a LVM volume you need to allow LVM to scan the devices with /, swap and /boot if applicable. If that is the case and / (root) etc. is on sda you have to add something like ‘ "a/sda[1-9]$/", "r/emcpowera2/", ‘ to the beginning of the filter. 

 

Read the PowerPath Installation Guide for version 5.0 rev A02 for further instructions.

 

Once the fileter has been configured correctly you need to run the following commands:

$ vgscan –v          (Rebuilds the LVM Cache)

$ lvmdiskscan        (Verify that the devices you expect to be filtered are not listed)

$ mkinitrd           (Update initrd to reflect the config changes)

 

 

---

Harald Jensås

 

 

From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Mad Unix
Sent: 13 December 2007 16:51
To: linux-poweredge-Lists
Subject: end_request I/O error

 

My server is attached to SAN
I have the following notes inside my dmesg

SCSI device sdb: 10485760 512-byte hdwr sectors (5369 MB)
sdb: test WP failed, assume Write Enabled
sdb: asking for cache data failed
sdb: assuming drive cache: write through
SCSI device sdb: 10485760 512-byte hdwr sectors (5369 MB)
sdb: test WP failed, assume Write Enabled
sdb: asking for cache data failed
sdb: assuming drive cache: write through 
 sdb:<6>sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0 
Dev sdb: unable to read RDB block 0
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0 
Buffer I/O error on device sdb, logical block 0
sd 1:0:0:0: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sdb, sector 0 
Buffer I/O error on device sdb, logical block 0
 unable to read partition table
sd 1:0:0:0: Attached scsi disk sdb
  Vendor: DGC       Model: RAID 5            Rev: 0324
  Type:   Direct-Access                      ANSI SCSI revision: 04 
SCSI device sdc: 20971520 512-byte hdwr sectors (10737 MB)
sdc: Write Protect is off
sdc: Mode Sense: 87 00 00 08
SCSI device sdc: drive cache: write through
SCSI device sdc: 20971520 512-byte hdwr sectors (10737 MB) 
sdc: Write Protect is off
sdc: Mode Sense: 87 00 00 08
SCSI device sdc: drive cache: write through
 sdc: sdc1
sd 1:0:0:1: Attached scsi disk sdc
  Vendor: DGC       Model: RAID 5            Rev: 0324
  Type:   Direct-Access                      ANSI SCSI revision: 04
SCSI device sdd: 10485760 512-byte hdwr sectors (5369 MB)
sdd: Write Protect is off
sdd: Mode Sense: 87 00 00 08
SCSI device sdd: drive cache: write through 
SCSI device sdd: 10485760 512-byte hdwr sectors (5369 MB)
sdd: Write Protect is off
sdd: Mode Sense: 87 00 00 08
SCSI device sdd: drive cache: write through
 sdd: unknown partition table
sd 1:0:1:0: Attached scsi disk sdd 
usb 2-1: new low speed USB device using uhci_hcd and address 2
  Vendor: DGC       Model: RAID 5            Rev: 0324
  Type:   Direct-Access                      ANSI SCSI revision: 04
SCSI device sde: 20971520 512-byte hdwr sectors (10737 MB) 
sde: test WP failed, assume Write Enabled
sde: asking for cache data failed
sde: assuming drive cache: write through
SCSI device sde: 20971520 512-byte hdwr sectors (10737 MB)
sde: test WP failed, assume Write Enabled 
sde: asking for cache data failed
sde: assuming drive cache: write through
 sde:<6>sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required 

end_request: I/O error, dev sde, sector 0
Buffer I/O error on device sde, logical block 0
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required 

end_request: I/O error, dev sde, sector 0
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sde, sector 0 
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sde, sector 0
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready 
    Add. Sense: Logical unit not ready, manual intervention required

end_request: I/O error, dev sde, sector 0
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required 

end_request: I/O error, dev sde, sector 0
sd 1:0:1:1: Device not ready: <6>: Current: sense key: Not Ready
    Add. Sense: Logical unit not ready, manual intervention required


[root at linux4 ~]# pvs
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/emcpowerb not /dev/sdb
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdd not /dev/emcpowerb
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdf not /dev/sdd 
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdh not /dev/sdf
  PV         VG         Fmt  Attr PSize  PFree
  /dev/sda2  VolGroup00 lvm2 a-   67.62G    0 
  /dev/sdh   emc4_vg1   lvm2 a-    5.00G 4.00M
[root at linux4 ~]# vgs
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/emcpowerb not /dev/sdb
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdd not /dev/emcpowerb
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdf not /dev/sdd
  Found duplicate PV bh1L5cO1rWjVfKUc8RRNfmvaLxhgNgga: using /dev/sdh not /dev/sdf
  VG         #PV #LV #SN Attr   VSize  VFree
  VolGroup00   1   2   0 wz--n- 67.62G    0 
  emc4_vg1     1   1   0 wz--n-  5.00G 4.00M


-- 
madunix 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.us.dell.com/pipermail/linux-poweredge/attachments/20071215/798a1347/attachment-0001.htm

More information about the Linux-PowerEdge mailing list