Iscsi

From FoppaWiki

Jump to: navigation, search

The following is a short copy/paste + description from the experince I've had with isci. This was done on Centos 5.4 and opensolaris 10.x, but it should be fairly similar on other distributions. Check stuff like label and fstab for your chosen OS.

CENTOS

  • Install on Centos 5.x 
yum -y install iscsi-initiator-utils.i386
  • When you have to find available targets on iscsi device, you use discovery 
iscsiadm -m discovery -t sendtargets -p 192.168.1.5
  • List discovered iscsi target nodes and sessions 
iscsiadm -m node
iscsiadm -m session
  • Login and logout iscsi node and check your new mount. The -T is the unique target id, and --portal is the iscsi device 
iscsiadm -m node -T iqn.2004-04.com:iSCSI.slice01.BA9B62 --portal "192.168.1.5:3260" --login
fdisk -l
iscsiadm -m node -T iqn.2004-04.com:iSCSI.slice02.BA9B62 --portal "192.168.1.5:3260" --logout
  • Make partitions and filesystem, again this is for Centos 5.x 
fdisk /dev/sdb
n for new
p for primary
1 for first partition
default cylinders for full use
w for write
mkfs -t ext3 /dev/sdb1
  • Remove the default ext3 disk space reservation 
tune2fs -m 0 /mount/point
  • In order to be able to manage the iscsi targets in a sane way, I use label to keep track of the mounted iscsi targets, and obviously put them in fstab. This is for ext3 filesystem, and it will be different for different filesystem 
e2label /dev/sdd1 /data7
"LABEL=/data7            /data7                  ext3    defaults        0 0" >> /etc/fstab
  • On Centos 5.x I found out that the /dev/disk/by-path dir was the best place to find the relationship between the target and what device number it got, and next line is to print it out nicer 
(cd /dev/disk/by-path; ls -l | awk '{FS=" "; print $9 " " $10 " " $11}')

OPENSOLARIS

  • Install 
root@server# pkg install SUNWiscsi
  • Configure the Solaris client to see the target
  • You get the static IQN name from the iscsi host/server. Syntax is IQN,PORTAL(:PORT) 
root@server# iscsiadm modify discovery --static enable
root@server# iscsiadm add static-config iqn.2004-04.com.qnap:ts-809u:iscsi.122testdata.8d508d,192.168.110.122:3260
root@server# iscsiadm list static-config
Static Configuration Target: iqn.2004-04.com.qnap:ts-809u:iscsi.122testdata.8d508d,192.168.110.122:3260
root@server# iscsiadm list target
Target: iqn.2004-04.com.qnap:ts-809u:iscsi.122testdata.8d508d
        Target Portal Group Tag: default
        Connections: 0
  • Info on the iscsi targets. 
iscsiadm list target
iscsiadm list target -v iqn.2004-05.com.abcStorage:Tgt-1
iscsiadm list target -S iqn.2004-05.com.abcStorage:Tgt-1
  • Create the iSCSI device links for the Solaris IO subsystem. 
root@server# devfsadm -i iscsi
root@server# format
root@bfzfs1-1:~# format
Searching for disks...

c0t600140501E2A26ED1855D40B7D87B7DFd0: configured with capacity of 2047.89GB

AVAILABLE DISK SELECTIONS:
       0. c0t600140501E2A26ED1855D40B7D87B7DFd0 <QNAP-iSCSIStorage-3.1 cyl 53467 alt 2 hd 255 sec 315>
          /scsi_vhci/disk@g600140501e2a26ed1855d40b7d87b7df
       1. c7t0d0 <DEFAULT cyl 19454 alt 2 hd 255 sec 63>
          /pci@0,0/pci8086,340e@7/pci1000,3140@0/sd@0,0
       2. c7t1d0 <DEFAULT cyl 19454 alt 2 hd 255 sec 63>
<snip>
  • If this is a new "disk" you should create filesystem. If this is old data from ext3 or else look below for FSWpart. 
root@server# newfs /dev/rdsk/c0t600140501E2A26ED1855D40B7D87B7DFd0s2
newfs: construct a new file system /dev/rdsk/c6t7d0s2: (y/n)? y
Warning: 11340 sector(s) in last cylinder unallocated
/dev/rdsk/c6t7d0s2:     83859300 sectors in 5547 cylinders of 240 tracks, 63 sectors
        40946.9MB in 793 cyl groups (7 c/g, 51.68MB/g, 6272 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
 32, 105936, 211840, 317744, 423648, 529552, 635456, 741360, 847264, 953168,
Initializing cylinder groups:
...............
super-block backups for last 10 cylinder groups at:
 82873712, 82979616, 83085520, 83191424, 83297328, 83403232, 83509136,
 83615040, 83720944, 83826848,

root@server# mkdir /iscsi
root@server# mount /dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0s2 /iscsi
  • "Uninstall" 
iscsiadm remove static-config iqn.2004-04.com.qnap:ts-809u:iscsi.122testdata.8d508d,192.168.110.122:3260
iscsiadm modify discovery --static disable
  • FSWpart for ntfs and ext support 
HOW TO Install 
--------------
1) Install the FSWpart package

Download http://www.belenix.org/binfiles/FSWpart.tar.gz
Uncompress: gunzip -c FSWpart.tar.gz | tar xvf -
Install: pkgadd -d . FSWpart

2) Install the FSWfsmisc package

Download http://www.belenix.org/binfiles/FSWfsmisc.tar.gz
Uncompress: gunzip -c FSWfsmisc.tar.gz | tar xvf -
Install: pkgadd -d . FSWfsmisc

root@server# prtpart
Available disk devices:

/dev/rdsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p0
/dev/rdsk/c7t0d0p0
/dev/rdsk/c7t1d0p0
/dev/rdsk/c9t0d0p0
/dev/rdsk/c9t1d0p0
/dev/rdsk/c9t2d0p0
/dev/rdsk/c9t3d0p0
/dev/rdsk/c9t4d0p0
/dev/rdsk/c9t5d0p0
/dev/rdsk/c9t6d0p0
/dev/rdsk/c9t7d0p0

Use /usr/bin/prtpart <disk device> to get partition details
Use /usr/bin/prtpart -help for usage help
root@server# prtpart /dev/rdsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p0 -ldevs

Fdisk information for device /dev/rdsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p0

** NOTE **
/dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p0      - Physical device referring to entire physical disk
/dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p1 - p4 - Physical devices referring to the 4 primary partitions
/dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p5 ...  - Virtual devices referring to logical partitions

Virtual device names can be used to access EXT2 and NTFS on logical partitions

/dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p1        Linux native
root@bfzfs1-1:~# mount -F ext2fs /dev/dsk/c0t600140501E2A26ED1855D40B7D87B7DFd0p1 /mnt/qnapmount/
Retrieved from "http://wiki.foppa.dk/index.php/Iscsi"
Personal tools
menu