PNFS Block Server Setup Instructions
From Linux NFS
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).
Note that this is an early development prototype, and recently has not been actively maintained; thus this is recommended for developers only.
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.
- 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.
