> -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of hank peng > Sent: Sunday, January 04, 2009 7:08 PM > To: linux-raid > Subject: Are there some alignment settings when creating filesystem on > RAID5 array which can improve performance? > > Hi, everybody: > I have a machine and centos 5.2 installed on it. I have created a > RAID5 array with five SATA disks, then I create LVM on this array. > #pvcreate /dev/md0 > #vgcreate myvg /dev/md0 > #lvcreate -n mylv myvg > As you see, I want to use XFS or ReiserFS on "mylv" volume. I wonder > if there are some alignment settings when creating such file systems > so that a better R/W performance can be achieved. Thx in advance. > > > -- > The simplest is not all best but the best is surely the simplest! > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" > in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Yes, but be specific. How do you use the volume? Do you want to optimize for IOPs or raw file transfer? What is mix of random vs sequential for both reads and writes. What is block/chunk size of volume, raidset, filesystem? Reveal your journaling settings. What are you getting now, and how did you measure it? Are things like NCQ/TCQ/read-write cache enabled or disabled? How are the disks physically attached? PCI(-X) or PCIe, how many channels are you using, or are the disks attached via USB ports. Need more info. ��.n��������+%������w��{.n�����{����w��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
