Hi Martin, #mkfs.xfs /dev/vdb #mount /dev/vdb /mnt/ (default xfs options) #fio --filename=/mnt/test1 --rw=randwrite --bs=4k --iodepth=40 --size=10000M --groupe_reporting --name=file1 --ioengine=libaio
I take the iops result. (this is an average) I didn't have tested lvm, maybe it could be great to test it over local storage and over iscsi storage. Alexandre ----- Mail original ----- De: "Martin Maurer" <[email protected]> À: [email protected] Envoyé: Jeudi 8 Novembre 2012 21:05:23 Objet: Re: [pve-devel] new cache benchmark results Thx for testing! What command do you run exactly to get this benchmark number? I just want to make sure that I can compare your results with mine in the right way. Martin > -----Original Message----- > From: [email protected] [mailto:pve-devel- > [email protected]] On Behalf Of Alexandre DERUMIER > Sent: Donnerstag, 08. November 2012 17:09 > To: [email protected] > Subject: [pve-devel] new cache benchmark results > > netapp nfs: raw file > --------------- > > default(no drive cache option) : 8000 > none: 13000 > writeback = 8000 > > > > netapp nfs: qcow2 file > --------------- > > default(no drive cache option) : 5000 > none: 12000 > writeback = 5000 > > > local raid controller (512MB CACHE with battery): raw file > ------------------------------------------------- > default(no drive cache option): 10000 > cache=none : 4000 > cache=writeback : 10000 > > > local raid controller (512MB CACHE with battery): qcow2 file > ------------------------------------------------- > default(no drive cache option): 9000 > cache=none : 6000 > cache=writeback : 9000 > > > > > So writeback seem to be faster on local storage, but slower on network > storage. > > Note : with shared storage, with writeback, I generally see big spike (faster > than cache=none), but after big slowdown (near zero) during 5-10s. > So I think this is when the host need to flush the datas, it add more > overhead. (maybe network latency have an impact...) > > > _______________________________________________ > pve-devel mailing list > [email protected] > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
