0
votes
0answers
25 views

Optimizing disk performance on KVM VM configuration

I have a KVM host server running Ubuntu 12.04 LTS, bare bones installation with only KVM installed. The server has an 8 Core Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz CPU with 32GB of RAM and SATA ...
0
votes
1answer
40 views

size of extent on LVM2

in LVM1 there was a limit of 65k extends. So size of extent had to been chosen carefully between wasted space on partitions (to big extent) and maximal possible size of logical volume (too small ...
1
vote
0answers
55 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
2
votes
1answer
74 views

Creating “Odd” Size Disks in VmWare/Linux

I believe I suffer from "everything must be in powers of 2" syndrome. When asked to create a 30G disk in VmWare for a VM I want to create a 32G disk. If someone needs 256G of storage using LVM I ...
2
votes
1answer
52 views

Why the I/O rate difference between an LV and PV?

I have been doing some benchmarks reading with dd from both the LVM device and the PV device and I got some unexpected results: $ sync ; echo 3 > /proc/sys/vm/drop_caches; dd bs=1M count=1024 ...
1
vote
2answers
349 views

Are ext4 RAID5 tuning options useful under LVM?

I'm setting up a system with a system with a mdadm RAID5 which is the sole PV for a VG which hosts 4 LVs. When I make the filesystem, would the mkfs.ext4 -E option be useful? Or is its effect not ...
4
votes
2answers
1k views

Does Proxmox VE Support LVM as block storage for KVM guests?

Does Proxmox VE Support LVM as block storage for KVM guests to avoid the overhead of going through the filesystem layer on the host system ?
4
votes
2answers
81 views

LVM Configuration possible?

I have hard discs D1 and D2 which are 140GB each and D3,D4 which are 600GB. I've been reading about the benefits of using LVM and I was thinking about the following configurations. This one would ...
2
votes
2answers
213 views

16tb raid6 + lvm, to partition or not to partition?

So I have a 16tb raid6 on one of a new batch of machines I am setting up. I will be using LVM on top of this and am wondering if there are any compelling reasons to break the raid up into partitions ...
5
votes
1answer
4k views

HP DL380 G7 + Smart Array P410i + sysbench -> poor raid 10 performance

I have running system with low IO utilization: HP DL380G7 ( 24gb RAM ) Smart Array p410i with 512mb battary backed write cache 6x SAS 10k rpm 146gb drives in RAID10 Debian Squeze linux, ext4 + LVM, ...
5
votes
3answers
6k views

What KVM disk type to use?

I'm setting up a few KVM virtual guests and I'm debating which disk type to use. I haven't been able to find a good resource online that runs down the pros and cons of each. Can you help me create a ...
3
votes
1answer
1k views

Very slow write performance on Debian 6.0 (AMD64) with DMCRYPT/LVM/RAID1

I'm seeing very strange performance characteristics on one of my servers. This server is running a simple two-disk software-RAID1 setup with LVM spanning /dev/md0. One of the logical volumes ...
1
vote
2answers
2k views

How to interpret IOZone results?

Here are the resuts of running IOZone on an ext3 filesystem on an LVM volume residing on a SAN LUN (it was ran with 5 parallel processes). "Throughput report Y-axis is type of test X-axis is number ...
0
votes
2answers
288 views

Slow write to LVM with snapshot

I use Ubuntu 10.04 Server. Write very slow, when I use LVM snaphot. This is normal?
8
votes
3answers
4k views

LVM Performance overhead?

I would be thankfull if someone who understands how LVM works, could tell me a rough estimate, how much slower using LVM (with a Software RAID1) will be. (What I do not want to know how much slower ...
7
votes
5answers
7k views

Linux md vs. LVM performance

I am trying to tune my NAS, running openfiler, and wondering why I'm getting relatively poor read performance from 4 WD RE3 drives in RAID 5. EDIT: Please note I am talking about the buffered disk ...
4
votes
4answers
2k views

SSD drives and RAID configurations vs LVM

Background: I'm familiar with the basic RAID levels, and am curious to know if using SSD devices in a RAID0 or RAID5 would be a better deployment than adding them to a large LVM volume. ...
2
votes
9answers
2k views

For what sort of Linux desktop is LVM striping worthwhile?

I run several Linux machines at home and at work. Most of my computing is I/O-limited, e.g., large compiler regression suites and the like. At home I also have one machine that captures ...
8
votes
3answers
5k views

Xen image file vs partition/LVM volume performance

I read quite a lot of advice to switch from file-image VM storage, to partition/LVM volume based. The claim is that partition/LVM are much faster then image files. The downside in my opinion, is ...