Playing with an Equallogic storage
Last week, I received a Dell Equallogic storage in SAP’s lab to experiment how it works with SAP. This is how I set it up with a SUSE Linux Enterprise 10 as initiator. The good news is that you almost cannot do anything that is wrong or takes you too much time. You get a big poster that describes every step. Anyway, here are all the steps, including those that you will find on the poster.
Set up the storage as described in the paper “PS Series Storage Arrays”:
PS5000 Hardware Installation
Unpack it from the box
Install it into a rack
Connect the array power cables
Connected the array to the network
Turn on power
Gather SAN information. In this example I assume our IP addresses will be 10.20.90.38 and 10.20.90.113
Install the Host Integration Tools CD to my Windows-Laptop
Carry your laptop to the datacenter and launched the Remote Setup Wizard
Discover the array using the tool
Initialized the array: IP is 10.20.90.38. Remember the passwords you set.
Configure a new group, e.g. group01 with IP 10.20.90.113
Use a web browser to surf to http://10.20.90.113
Log in as “grpadmin”, using the password you set.
You see a web interface. I clicked on “Create volume” and created an 150GB volume.
Now I wanted to know if the storage already provides an iscsi target, so I went to wikipedia and found out the default port for iscsi is 3260. With this information, I went back to my Linux server in the network and took a look if the storage allows for iscsi connections:
tstaerk@ls3122:~> nmap -p 3260 10.20.90.38
Starting Nmap 4.00 ( http://www.insecure.org/nmap/ ) at 2009-02-09 14:06 CET
Interesting ports on ls3073.wdf.sap.corp (10.20.90.38):
PORT STATE SERVICE
3260/tcp open unknown
I was pleasantly surprised – the iscsi port is already open.
To get access to this volume from SUSE Linux, I do the following:
yast2 -> Network Services -> iscsi Initiator -> Discovered Targets -> Discovery -> (select your volume) -> log in -> Connected Targets -> Toggle Status (to automatic) -> Finish
This looks like this:
Now I see the volumes have appeared in my system:
ls3206:/slcs # hwinfo --block --short
/dev/sda DELL PERC 6/i
/dev/sdb DELL PERC 6/i
/dev/sdc Dell Virtual Floppy
/dev/sdd EQLOGIC 100E-00
/dev/sde EQLOGIC 100E-00
Linux gurus know it already, now you have to “format” the volumes. Technically, formatting is to make a filesystem, erasing all data. I decide for Linux’ ext3 file system:
ls3206:/slcs # mkfs.ext3 /dev/sde
Then I can mount the volume to /usr/sap and use it for an SAP installation:
ls3206:/slcs # mount /dev/sde /usr/sap
ls3206:/slcs # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 275G 36G 225G 14% /
udev 32G 228K 32G 1% /dev
ls3001:/export/suse 250G 198G 53G 80% /mnt/suse
nsl01a:/vol/linuxlab 1.0T 844G 181G 83% /mnt/filer
/dev/sdd 50G 180M 47G 1% /mnt/sdd
/dev/sde 148G 99G 42G 71% /usr/sap
Now the next step is to measure performance – this will be the topic of my next blog.