PNFS Block Server Setup Instructions

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Line 71: Line 71:
  yum install libnfsidmap-devel
  yum install libnfsidmap-devel
  yum install nfs-utils-lib-devel
  yum install nfs-utils-lib-devel
 +
yum install openldap-devel
  yum install libgssglue-devel
  yum install libgssglue-devel

Revision as of 21:03, 10 October 2010

How to guide to setup the pNFS Block Layout server based on sPNFS

This page describes the setup of the pNFS Block Layout Server. This is based on the Rick McNeal's how to guide. Please note that Fedora 11 was used to setup the server, some of the content you see might be specific to Fedora ( for e.g yum).


Contents

Building the code


1) Building the kernel source

Obtain the code from Linux pNFS git. pNFS Block Layout server is currently a part of the pNFS git. 

    git clone git://linux-nfs.org/~bhalevy/linux-pnfs.git

CONFIG_SPNFS_BLOCK should be enabled before the compilation of the code.

This page doesn't discuss anything about kernel compilation.

2) Building the usespace daemon

There is a userspace daemon and this is required to be started before client access the block network. Source code an be obtained from the following git. 

    git clone git://git.linux-nfs.org/projects/rmcneal/ctl.git

To compile this code , parted, parted-devel and libevent packages should be installed on the machine. 

yum install parted
yum install parted-devel
yum install libevent
yum install libevent-devel

You might see couple or compilattion errors. Please note that below mentioned is just a temporary work around.

In file included from ctl.c:12: /usr/include/parted/device.h:140: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token In file included from /usr/include/asm/types.h:4, from efi.h:26, from ctl.c:16: <ROOT_OF_SRC>/include/asm-generic/int-ll64.h:11:29: error: asm/bitsperlong.h: No such file or directory make: *** [ctl.o] Error 1


1) To get past the first error , the work around is I have updated the "/usr/include/parted/device.h" file , I have add an ifdef like the following.

Line 140 in device.h.

#ifdef notdef extern PedConstraint* ped_device_get_constraint (PedDevice* dev); #endif

2) I have created a symbolic link to <ROOT_OF_SRC>/include/asm-generic/bitsperlong.h in <ROOT_OF_SRC>/include/asm-generic.



3) Building the nfsutils

Obtain the "nfs-utils" source code. 

    git clone  git://linux-nfs.org/~bhalevy/pnfs-nfs-utils

Run the autogen.sh to generate the "configure" file. If you are trying to build the code first time several pacakages are required. I have either installed or updated the following packages. 

yum install libtirpc-devel
yum install tcp_wrappers-devel
yum install libevent-devel
yum install libnfsidmap-devel
yum install nfs-utils-lib-devel
yum install openldap-devel
yum install libgssglue-devel

# Fedora 12 requires also:
yum install libblkid-devel
yum install device-mapper-devel

# Fedora 13 requires also:
yum install krb5-devel

Exporting the filesystem

For the block access to work properly the disks must have a signature. Partetioned the disks using "parted". Disks partetioned with "fdisk" doesn't have the signatures.

I have followed the below mentioned steps.

  1. parted /dev/sdb 
(parted) mklabel gpt
(parted) mkpart 1 <Provide start and end of the partetions>
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number  Start   End     Size    File system  Name  Flags
1      17.4kB  53.7GB  53.7GB  ext3         1     msftres

I have tested with ext4 filesystem, create ext4 filesystem with 4K block size. 


 # mkfs.ext4 -b 4096 /dev/sdb1


Setting up the BLOCK storage / SAN

I haven't setup the block storage and metadata server on the same machine. You may setup them on two different machines , but client and metadata sever should see the same disks.


I have used ISCSI to setup the block storage , "scsi-target-utils" is required to setup the iscsi target. One key thing is when adding a LUN to the target , don't add the disk partettion (/dev/sdb1) , instead add the entire disk(/dev/sdb).

The disk signatures are not visible when if you add the disk partetion to the target.

Export Options

/mnt *(rw,sync,fsid=0,insecure,no_subtree_check,no_root_squash,pnfs)

How to Start the server

I have used the following scrpit to start the server 

#/bin/bash 
# UMOUNT /mnt
umount /mnt
#start the service
service tgtd restart
sleep 8
# Create iSCSI target
tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.1992-05.com.emc:openblock
# Expose LUN as iSCSI target
tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --backing-store /dev/sdb
# Allow acces of all initiator
tgtadm --lld iscsi --mode target --op bind --tid 1 --initiator-address ALL
# show all the details
tgtadm --lld iscsi --op show --mode target
# mount the partetion
mount /dev/sdb1 /mnt
sleep 3
# start the nfs server
service nfs restart
sleep 3
# start the deamon
cd <CTL_SRC>/ctl/
./ctl -u &

Mount from the client

mount -t nfs4 -o minorversion=1 SN:/ /mnt/ob

How to verify 

 - tcpdump/wireshark  is the best way to see what is happening.
 - The other way is after mounting the export,on the client check /proc/self/mountstats.
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