[CentOS] udev works ok in CentOS 6.x??

C. L. Martinez carlopmart at gmail.com
Tue Mar 13 07:30:17 UTC 2012

Hi all,

 I have strange problem with my persistent names applied to iscsi
disks. I have configured an udev rule to assign static iscsi disk

KERNEL=="sd[a-z]", SUBSYSTEM=="block", PROGRAM="/sbin/scsi_id
--whitelisted --replace-whitespace --device=/dev/$name",
RESULT=="1iTGTDSK9a2c73ce654d0ca6", NAME="iscsi/sda"
KERNEL=="sd[a-z][0-9]*", SUBSYSTEM=="block", PROGRAM="/sbin/scsi_id
--whitelisted --replace-whitespace --device=/dev/$name",
RESULT=="1iTGTDSK9a2c73ce654d0ca6", NAME="iscsi/sda%n"

 When udev starts, it seems it works:

[root at cossrv01 rules.d]# ls -la /dev/iscsi/sda
brw-rw---- 1 root disk 8, 16 Mar 12 11:42 /dev/iscsi/sda

After this, I try to create a lvm volume:

[root at cossrv01 rules.d]# pvcreate /dev/iscsi/sda

 ... and works. But:

[root at cossrv01 rules.d]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               cmdata
  PV Size               64.00 GiB / not usable 4.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              16382
  Free PE               12542
  Allocated PE          3840
  PV UUID               rSuu5T-VtRl-ffDd-5Vtm-CBhS-UffO-sFgCRX

Why? Why pvdisplay doesn't shows /dev/iscsi/sda instead of /dev/sdb??
It is a big problem when multiple iscsi disks are assigned in aleatory
form ... and with CentOS 5.x this procedure works out of the box ...
(with RHEL6.x doesn't works neither, but it works with RHEL5.x).


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