[Lustre-discuss] howto make a lvm, or virtual lvm?
Eudes PHILIPPE
eudes at cisneo.fr
Wed Dec 15 11:14:03 PST 2010
Mhhh... it's strange, but it's done! Except... if each ost are on different servers... the creation of lvm you mean, is on one ost server. And on the client server which mount the mds partition, there is one or several ost on several servers.
I want to merge ALL ost on a "similar" lvm, or, a raid 5(?) over network
Are you sure it is the better way in a production environment ?
-----Message d'origine-----
De : Ben Evans [mailto:Ben.Evans at terascala.com]
Envoyé : mercredi 15 décembre 2010 19:55
À : Eudes PHILIPPE; lustre-discuss at lists.lustre.org
Objet : RE: [Lustre-discuss] howto make a lvm, or virtual lvm?
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
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