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

[Ben Evans]

Phillipe,

One way to circumvent this would be to create one file on each OST, loop mount them on the client and use pvcreate on each to size them at ~950 MB.  Once you've done that create a VG (striped, stripe size should be exactly 1M (lustre's preferred I/O size), and you should be good to go.

It's been awhile since I've played around with doing this, but it's the basic idea.

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Eudes PHILIPPE
Sent: Wednesday, December 15, 2010 12:06 PM
To: lustre-discuss at lists.lustre.org
Subject: [Lustre-discuss] howto make a lvm, or virtual lvm?

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


_______________________________________________
Lustre-discuss mailing list
Lustre-discuss at lists.lustre.org
http://lists.lustre.org/mailman/listinfo/lustre-discuss