Volumes Question
Question
Currently I got 2 servers and connecto both 2 SAN storage (configure 4 volumes on each SAN storage).
And also I am going to build a cluster on the servers.
But before build the cluster I need to fix this problem. How can I make this duplicated volumes in to 2 single volume. Both servers has same problem.
[root@seerver1 ~]# cat /proc/partitions
major minor #blocks name
8 0 71652960 sda
8 1 512000 sda1
8 2 71139328 sda2
8 16 976560 sdb <=LUN
8 32 117187472 sdc <=Mysql
8 48 97656240 sdd <=FSMSC
8 64 48828112 sde <=Tomcat
8 80 976560 sdf <=LUN
8 96 117187472 sdg <=Mysql
8 112 97656240 sdh <=FSMSC
8 128 48828112 sdi <=Tomcat
253 0 52428800 dm-0
253 1 2064384 dm-1
Thanks
Danny
Responses
Hi Danny,
I do not see any problem here.
Are you talking about the two devices sdb and sdf seen for a single LUN. These are because there are two paths from the server to the storage. Could you please confirm this from your storage team as well ? In order to use this LUN, you will need some kind of multipathing solution. For example DM-Multipath in RHEL.
This will create a logical device mpathX that needs to be used.
For more details please see
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/DM_Multipath/index.html
https://access.redhat.com/knowledge/solutions/5549
- Nitin
Trying to parse what you're saying. Are you saying that each of the above /dev/sdX devices is a unique LUN and not two paths to the same LUN (e.g., sdc:Mysql and sdg:Mysql are actually two, discreetly-presented LUNs from your SAN)?
- If the pairs of /dev/sdX devices are actually pairs of discreet LUNs, you should be able to just mirror each pair in LVM
- If the pairs of /dev/sdX devices are actually path-pairs to a single LUN, then you need something like DM-multipath, Veritas Volume Manager, PowerPath, etc. to coalesce the paths into a single meta-device.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
