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Old 01-02-2014, 12:10 AM   #1
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Registered: Jan 2014
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Unhappy Linux partition creating issue

Hi Guys,

We have RHEL 5.9 and NetApp 7 mode storage. I have problem in creating partition in those NetApp LUNs It is not allowing me to create partition "pvcreate command failed. Command attempted: "/usr/sbin/pvcreate -M 2 /dev/sde" -system error message: device /dev/sde not ound (or ignored by filtering)". We tried a lot of things, but didn't help. Currently we investigate multipath.conf file and lvm.conf file.
Does anyone have any idea what's wrong?

My multipath.conf file

defaults {
user_friendly_names no
queue_without_daemon no
flush_on_last_del yes
max_fds max
pg_prio_calc avg
blacklist {
devnode "^hd[a-z]"
devnode "^(ram|raw|loop|fd|md|dm-|sr|sdc|st)[0-9]*"
devnode "^cciss.*"
devices {
device {
vendor "NETAPP"
product "LUN"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_alua /dev/%n"
features "3 queue_if_no_path pg_init_retries 50"
hardware_handler "1 alua"
path_grouping_policy group_by_prio
failback immediate
rr_weight uniform
rr_min_io 128
path_checker tur
path_selector "round-robin 0"
flish_on_last_del yes
My lvm,conf file
preferred_names = [ "^/dev/cciss/", "^/dev/mpath", ]
filter = [ "a/sda[1-9]$/" "a/mpath.*/" "r/.*/" ]

And I have attached the error that which i got while creating partition, Thanks in advance by Magesh

Last edited by; 01-02-2014 at 12:14 AM. Reason: Added error message
Old 01-02-2014, 11:45 AM   #2
Registered: Aug 2010
Location: Beaverton, Oregon, USA
Distribution: Pfsense, Ubuntu, Centos, Fedora, Redhat, Scientfic, MacOS
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I don't have much experience with multi-path, or netapp. I assume you are using iscsi of some type that makes block-level access to the netapp LUNs, and sde is only ONE of the devices that your multipath-device will eventually refer to.

First, does /dev/sde exist? ie: does it appear in the system boot messages, or the output of dmesg? If it does not, there is some sort of issue at the kernel driver level.
If it does exist, can you run simpler programs like "fdisk /dev/sde" on it?

Second, does the netapp allow partition-table level access, or does it have some sort of security blockage that needs to be loosened when first creating partitions? For that matter, does your user "root" translate across to the netapp? (I am mixing my nfs knowledge: disregard as needed if it doesn't apply...)

Third (here is where my understanding gets fuzzy) if sde is the combined device, you may need to access the individual devices.

I hope that helps...

Old 01-02-2014, 01:36 PM   #3
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Normally, Netapp Ontap has its own OS and filesystem. It CAN provide direct lun access... but it is (as I recall) an added expense, where NFS was part of the base license.

The NetApp filesystem is more efficient on NetApp - it allows failover, checkpointing, and local recovery, as well as detecting pre-failure modes of its disks, and allows for replacement/updates on the fly...

Using NFS is faster and more efficient (if you have the right infrastructure you can backup an entire 16TB filesystem to another in about 9 hours).

I wouldn't use raw lun access - loss of redundancy, and recovery mostly. NFS allows the same filesystem to be shared...


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