[Lustre-discuss] howto make a lvm, or virtual lvm?

Eudes PHILIPPE eudes at cisneo.fr
Wed Dec 15 09:06:17 PST 2010


Hello

I’m newbie on lustre ☺

Currently, i make some test on virtual machines.

I’ve:
- Server mds1 for mdt mgs
- Server ost1 for data, with 2 drives 1Go (for test, it's some virtual machines)
- Server client to mount mds

On server mds1
/dev/sda3              93G  461M   87G   1% /mds

On server ost1
/dev/sdc             1008M  64M  967M  2% /home/ost2
/dev/sdb             1008M  957M   68K 100% /home/ost1

(
Or 
On server ost1
/dev/sdb             1008M  957M   68K 100% /home/ost1

On server ost2
/dev/sdb             1008M  64M  967M  2% /home/ost2
}


On client
192.168.45.20 at tcp0:/large-fs        2,0G  1,3G  629M  68% /home

At the end, I want (if it's possible), a raid 5 over Ethernet, or, 1 physical raid 5 on each ostX and a big lvm I can extend as I want....

For my first test, I upload on client a file (1.8 Go) (each ost have 1 Go)
The problem, is, when sdb is full, he stop the copy, and don't continue on ost2

Maybe I must create a lvm, but I don't found howto to (maybe it's possible to create lvm without format when I add others ost later..)

Questions:
- it's the good way?
- How I can write a 1.8Go (one file) on the 2 os, one part on ost1, one and final part on ost2

Regards





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