On Mon, Feb 13, 2012 at 12:54 PM, David Brown <david@xxxxxxxxxxxxxxx> wrote: > On 12/02/2012 21:16, CoolCold wrote: >> >> First of all, Stan, thanks for such detailed answer, I greatly appreciate >> this! >> >> On Sat, Feb 11, 2012 at 8:05 AM, Stan Hoeppner<stan@xxxxxxxxxxxxxxxxx> >> wrote: >>> >>> On 2/10/2012 9:17 AM, CoolCold wrote: >>>> >>>> I've got server with 7 SATA drives ( Hetzner's XS13 to be precise ) >>>> and created mdadm's raid10 with two near copies, then put LVM on it. >>>> Now I'm planning to create xfs filesystem, but a bit confused about >>>> stripe width/stripe unit values. >>> >>> >>> Why use LVM at all? Snapshots? The XS13 has no option for more drives >>> so it can't be for expansion flexibility. If you don't 'need' LVM don't >>> use it. It unnecessarily complicates your setup and can degrade >>> performance. >> >> There are several reasons for this - 1) I've made decision to use LMV >> for all "data" volumes (those are except /, /boot, /home , etc) 2) >> there will be mysql database which will need backups with snapshots 3) >> I often have several ( 0-3 ) virtual environments (OpenVZ based) which >> are living on ext3/ext4 (because of extensive metadata updates on xfs >> makes it the whole machine slow) filesystem and different LV because >> of this. >> > > This is a bit off-topic, but do you know of any way to get OpenVZ running on > a kernel newer than 2.6.32? One important feature in 2.6.33 is mergeable > LVM snapshots, which would be particularly useful for OpenVZ, such as when > updating, upgrading or otherwise changing a virtual machine. With mergeable > snapshots you could take a snapshot, apply the changes to the snapshot, and > if it works you merge them back into the main logical partition. No, I do not know such solutions except _may be_ using RHEL (Centos/SL) kernels as OpenVZ team does patches for RHEL kernels as primary targets and RH may backport some features into their .32 kernel. So if RHEL will/does have mergable LVM snapshots, then you will need to wait some time and OpenVZ featured kernels will have this too. > > mvh., > > David > -- Best regards, [COOLCOLD-RIPN] -- 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
