1
vote
1answer
65 views

Linux Server OS on LVM on Software RAID: Best Practices and Considerations

I am preparing for a minimal Ubuntu Server 12.04 LTS that will simply run libvirt/KVM to host a handful of Ubuntu Server 12.04 LTS guests. On my KVM host I created a RAID 1 comprised of two physical ...
1
vote
4answers
97 views

Best Linux Partitioning for Multiple Resizeable HDD

My ISP has a machine with 6 HDDs (3TB+3TB+3TB+2TB+2TB+1TB) which we want to turn into a FTP/Download server for local users. I am planning to install CentOS 6.5 on one 2TB, rest of all space shall ...
2
votes
0answers
109 views

Restore LVM if VG is not consistent (XenServer 5.6.1)

i have a VG that uses the PVs /dev/md1 and /dev/md2. Now one hdd failed in /dev/md1: [root@xenserver1 ~]# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda3[0] 382320128 blocks ...
0
votes
0answers
311 views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
0
votes
1answer
317 views

Creating raid1 array with mdadm cuts space

I'm trying to create RAID1 mirrored disks on already deployed system (CentOS 6.4). I have two disks: source /dev/sda with the OS and /dev/sdb which will be the mirror. The disks are connected from ...
0
votes
1answer
324 views

Grub can't find Xen multiboot file

I am running Debian Wheezy on a software RAID 0 with LVM. I'm trying to get Xen to work but grub refuses to boot in it. I installed Xen by following the instructions here: http://wiki.debian.org/Xen ...
1
vote
1answer
104 views

Does Ubuntu 12.04 LTS support booting from RAID 6?

I'm setting up a new Ubuntu server using 12.04.2 LTS. I have five drives that I am setting up in a RAID 6 with LVM. Can I use this for bootup? Or should I make a separate RAID 1 partition for bootup ...
1
vote
0answers
76 views

Single drive LVM to RAID6 LVM

I cloned my entire LVM volume group from a single drive to a RAID5 array with 3 disks. The VG is formed by these logical volumes: root swap home ... and other volumes of some XEN virtual machines. ...
4
votes
1answer
720 views

mdadm+zfs vs mdadm+lvm

This may be a naive question since I'm new to this and I cannot find any results about mdadm+zfs, but after some testing it seems it might work: The use case is a server with RAID6 for some data that ...
18
votes
2answers
3k views

Readahead Settings for LVM, Device-Mapper, Software Raid and Block Devices - what wins?

I've been trying to find a straight answer on this one, and it has proved elusive. This question and its answer is close, but does not really give me the specifics I would like. Let's start with ...
0
votes
1answer
283 views

How do I recover from boot error when my root is on RAID and LVM? [closed]

When a (Archlinux) system that has its root on RAID and LVM is misconfigured and does not boot, what steps are needed to recover it?
4
votes
1answer
346 views

3 drives fell out of Raid6 mdadm - rebuilding?

i had an mdadm raid6 array with 13x1TB drives. Within 10 minutes 3 of these drives fell out of the array... we assume bad cable to the controller card and replaced, however now we need to get the ...
2
votes
0answers
422 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
1
vote
0answers
249 views

After upgrade to SLES11 SP1 - LVM on top of software RAID5 not working anymore

On a system where I have been running OpenSuSE11.1 for some time I performed a fresh installation of SLES11 SP1. The system used a software RAID5 system on top of which an LVM was setup with a single ...
0
votes
1answer
199 views

Allignment of ext3 partition on LVM RAID volume group

I'm trying to add a partition on a LVM that resides on a RAID6 volume group and fdisk is complaining about the partition not residing on a physical sector boundry. My question is, how do you ...
0
votes
4answers
318 views

What RAID Level Should Be Used

I am working on a server build project for work and have inherited the following items that I need to figure out the best way to handle and configure. 2 of these: I/O Crest SY-PEX40008 PCI-e SATA ...
3
votes
2answers
1k views

e2fsck / resize2fs problems

I've got 6 drives (each 1.5T, all same model and firmware revision) that are part of a RAID5 array. The RAID5 makes a LVM volume group and a logical group. The latter contains only one ext3 partition. ...
2
votes
1answer
1k views

LVM-on-RAID vs RAID10 vs RAID6

In the spirit of the question LVM mirroring VS RAID1 I thought I'd push a bit further. Suppose I have 4 identical hard drives (e.g. 1TB) that I want in a RAID setup for a backup/media server. LVM ...
1
vote
1answer
2k views

Rescuing grub on RAID+LVM

I have a dual SATA drive setup for a file storage/general purpose box, which is arranged thus: /dev/sda1 + /dev/sda1 = /dev/md0 RAID1 --> /boot /dev/sda2 + /dev/sdb2 = /dev/md1 RAID1 --> LVM with ...
6
votes
2answers
3k views

How to do the equivalent of Synology Hybrid Raid on Linux myself?

http://forum.synology.com/wiki/index.php/What_is_Synology_Hybrid_RAID%3F Synology is just Linux and uses LVM. How do their tools automate LVM to achieve what they call their Hybrid Raid?
1
vote
2answers
990 views

Software RAID, LVM, and Encryption Setup Questions

I have 4 hard drives, each with two partitions on them 10.1GB for swap and 990.1GB for the rest. I took this and set up two MD devices with RAID10, one for the set of 4 swap partitions and one for ...
2
votes
2answers
335 views

Partions, RAID, LVMs, and Encryption

I have an existing production server that is running 4 drives each 750 GB in size in two software RAID levels. RAID 1 for the /boot partition and RAID 5 for the rest of the partitions including the ...
1
vote
1answer
398 views

LVM over Raid 1 with different size disks in Ubuntu

I'm currently building a backup server for a few of the machines in the office. I plan to run ubuntu 10.04 LTS on it. My current setup is: 2 x 1TB disks in software RAID 1 configuration 2 x 2TB ...
1
vote
1answer
646 views

Clone and Restore CentOS Server. Raid/LVM

I have a CentOS server, and I want to create an exact copy of it. The device has a single 128MB drive mounted as /boot. I then have a 4 drive Software Raid 5 array, with 2 Logical Volumes on it. ...
5
votes
1answer
351 views

Where is the best place for LUKS to sit in a RAID/LVM/LUKS stack?

I am implementing a server storage setup making use of software RAID, LVM and LUKS. I can think of three combinations this configuration could take: RAID, LVM, LUKS RAID, LUKS, LVM LUKS, RAID, LVM ...
8
votes
1answer
2k views

Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?

On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on ...
19
votes
5answers
7k views

What is better LVM on RAID or RAID on LVM?

I currently have LVM on software RAID, but I'd like to ask you what you think it is better solution, maybe some pros and cons? Edit: It is about software raid on lvm or lvm on software raid. I know ...
8
votes
3answers
5k views

LVM volume group shared between KVM/libvirt host and guests: is this a bad idea?

I have just built a shiny new KVM/libvirt-based virtual machine host, containing 4 SATA II hard drives, and running CentOS 5.5 x86_64. I have decided to create virtual machine disks as logical ...
1
vote
2answers
995 views

How do I mount one half of a software Raid-1?

I have one disk out of a system which used LVM on top of software RAID-1. I can't seem to mount the partition. Here is the output of mdadm --examine mdadm --examine /dev/sdd3 /dev/sdd3: ...
1
vote
1answer
578 views

Assembling Software RAID in Live CD for data recovery

I need help recovering some data that's on my RAID which is on a LVM on my server running Ubuntu. What happened was I deleted the logical volume that controlled my swap space which was on a partition ...