RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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85 views

Can I convert an existing LVM VG to a stripe (RAID0 eq)?

I have an existing LVM volume group of 3 disks (ext4), with 4 logical volumes. Not quite ready for the leap to a nextgen FS, I would like to balance the load on the disks. I have seen you can create ...
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37 views

Ubuntu raid dirty degraded

I have Linux version 3.5.0-17-generic (buildd@allspice) (gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) ) #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 (per /proc/version). There are two raid arrays ...
3
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1answer
599 views

Can't mount RAID after upgrade

I just upgraded my box to 14.04 and on bootup I got a message, that my RAID devices can't be mounted automatically so I chose to skip it and work through it after boot time. Now booted up, A mount -a ...
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1answer
943 views

How to detect RAID 0 from Ubuntu Live CD?

I have Ubuntu 10.04 installed on a server with RAID 0 configuration. The server has many user accounts and the users have a lot of data in the server. The server has been crashed due to removal of ...
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38 views

Proxmox storage question

I am designing a proxmox installation for use as a home server, I chose it for the inherent flexibility and ease of administration, this restricts me to debian based solutions. So after some ...
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257 views

Linux / Windows 8.1 : Installation on raid0

I need to install a linux distribution on my laptop (an Asus UX302LA). I tried again and again but I couldn't even begin the installation. To explain you my problem, I know that Windows 8 is installed ...
0
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1answer
32 views

software raid priority (systemtap)

I'd like to know on which priority software raid works (level 1 if it matters). So I wrote simple systemtap script to do the job, but I'm not sure if I have done it correctly. [root@asus-ux21e ~]# ...
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0answers
27 views

How is default readahead value determined

I have two different devices running XFS and the default readahead value set differs between the two disks. Why is that ? How is the default size computed ? Is it device dependent ? I might also add ...
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52 views

Change Initramfs script

I made RAID 0 by mdadm'ing partition located on dmraid VIA VT6421 and Western Digital hdd. Installed Ubuntu on that RAID. Now, when I boot, I get (initramfs) ash prompt. There, I have to write mdadm ...
2
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1answer
194 views

Why does fstrim trim all of the free space on my mdraid mirror after a reboot? [duplicate]

I have a server with 2 SSDs: Model Family: Intel 520 Series SSDs Device Model: INTEL SSDSC2BW240A3F Firmware Version: 400i User Capacity: 240,057,409,536 bytes [240 GB] Sector Size: ...
3
votes
3answers
112 views

Recovering data from a failing RAID 5 setup

I have a four disk RAID 5 array that is in the process of failing hard. One disk is completely dead and smartctl is telling me that a second disk is failing. All the data on the RAID is backed up, ...
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1answer
631 views

Terrible performance on linux mint 16

I am having difficulty with getting linux mint to cooperate with my desktop. Specs: Mobo: Maximux IV Extreme-z CPU: i7 2600k GPU: 2x R9 290x Storage: (240GB) 2x OCZ Vertex 3 on RAID0 (Currently ...
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1answer
93 views

Cannot get status of “Adaptec AAC-RAID (Rocket) (rev 02)” HW RAID card

SERVER:~ # lspci | grep -i raid 0000:04:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02) SERVER:~ # arcconf getconfig 1 pd and after the arcconf, the command just hangs.. the server ...
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3answers
65 views

Possible problems in moving linux disks from one hardware to another

I currently have a server collocated in a datacenter. The hardware is a HP dual quad core xeon with 16 Gb DDR2 and 2 1Gb disks in raid1. I want to order another similar server to have as a ...
4
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2answers
238 views

RAID setups questions

I have a RAID setup questions My mobo supports hardware RAID, my question is, should I use the board's RAID system or freeNAS/Ubuntu's software RAID system? I realize performance is better with h/w, ...
1
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1answer
620 views

Run smartctl on all disks of a server

My question is a quite simple , I want to run the command smartctl -i -A on all disks that the server have. Think that I've too much server with different number of disks and RAID Controllers, then I ...
0
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2answers
134 views

Two arrays have slightly different array size with same size disks/partitions, why?

I created a software RAID 5 array one year ago using mdadm v3.2.x which shipped from CentOS 6.3, after few months, I moved/assembled the array to/in Fedora 19 (now Fedora 20). It had three 3TB disks ...
2
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1answer
3k views

How to setup a RAID system using USB sticks as storage media

I want to create an inexpensive self-hosted private git server with redundant storage. To that end I have bought a Raspberry Pi and configured both git and ssh on the Pi. I can access the Pi both from ...
2
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1answer
404 views

Proper way to setup RAID in linux

I have installed Debian 7.4 on a server, and through the installer I setup both RAID and LVM for the drive that the OS is installed on. However, now I want to add two 4TB drives in a RAID-1 array to ...
3
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1answer
48 views

understanding the “chunk size” in context of RAID

Am I correct that chunk size in context of RAID is essentially the same thing as cluster in file-system context? In other words, chunk size is the smallest unit of data which can be written to a ...
1
vote
1answer
377 views

Debian Squeeze RAID 5 Install?

I have a box with four Hard Drives on it. I am going to install Debian Squeeze (I know it's old... I have to) on it. I want to be able to treat the the four Hard Drives as a single Harddrive. Durringt ...
4
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2answers
429 views

Grow LVM RAID10?

RHEL LVM has supported RAID4/5/6 as of 6.3 and RAID10 as of 6.4. It's well-known that mdadm won't let you --grow raid10, my question is whether this is a limitation of LVM RAID10 too? If it is ...
3
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1answer
522 views

Proxmox Master Node crashes

I've inadvertently discovered a Proxmox bug. I run a personal cluster of 4 nodes (a technology lab for giggles and gags). Each node has a Dell Perc 5i and 4 HDDs in RAID 10. The standard Proxmox ...
0
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1answer
135 views

mdadm large memory consumption [closed]

I am building a RAID 6 with mdadm (8 WD Red 3 Tb) on Ubuntu 13.10x64 server with ext4 filesystem. When I download torrent on the array, server RAM is filled for maximum cap (8 Gb) memory is free when ...
0
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1answer
647 views

Fdisk cannot read size of this disk is 4.0 TB under RAID-0 enviroment

I have server from OVH data center , I have Two SATA Hard Disk Drive , each Disk Size 2.0 T.B , I have RAID controller card but I convert the RAID-1 to RAID-0 through OVH Rescue mode and here is the ...
2
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1answer
845 views

mdadm - RAID5 array size vs. actual disk size mismatch

I have 4x 3TB WD RED disks that are in mdadm RAID5, which should total an array size of 9TB usable space, however I only have 6TB. I have confirmed all disks are in the array, the only strange thing ...
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0answers
179 views

Tuning a CentOS VM running on an MDRAID-based XenServer storage repository

I've run out of ideas for tuning disk write speeds on a handful of CentOS VMs running on a lab XenServer 6.2 host. Running under the free license (so vendor support not a concern), the lab host is a ...
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1answer
346 views

Why is my ext4 filesystem recognizable only on the machine it was formatted on?

Xubuntu liveCD 11.04 running on "bad machine" with mdadm RAID1 array with an unrecognizable ext4 filesystem: To rescue some files, I installed a new hard drive and formatted it to ext4. I copied ...
2
votes
1answer
823 views

Mount an existing RAID 1 Logical Volume after OS upgrade

I just upgraded from Ubuntu 10.04 to Mint 16. The installer did not detect my existing RAID 1 array, and I can't access it anymore. My drives are: SDA - First RAID Disk SDB - Second RAID Disk SDC - ...
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2answers
49 views

How to migrate the content of one disk on a Raid5?

I have one 1.5Tb HDD with Debian Wheezy. I have also four 2Tb empty HDDs. I want to configure the four 2Tb disks in Raid5 and install LVM. Then migrate the content of the 1.5Tb disk on the Raid5. ...
0
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1answer
229 views

raid1: how to synchronize harddisks (Debian 6)

My system is Linux/Debian 6, using GPT (GUID Partition Table). If I run the command cat /proc/mdstat I see the following situation: Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] ...
8
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1answer
2k views

bit rot detection and correction with mdadm

I'm about to re-organise all my HDDs in my linux box nas and would like to use mdadm raid for data protection and its flexibility for reshaping the arrays. However, before I use mdadm for this I'd ...
2
votes
2answers
2k views

Best way to create RAID on an existing system drive

I want to add another disk as RAID 1 to test my database performance. I am trying to not re-do the whole system, is it possible? Currently I have a single 1TB HDD with one 100GB system partition (and ...
0
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3answers
353 views

Software RAID 1 with dissimilar size and performance drives

Background I was experimenting with a home server setup in a small box I had that was supposed to be a media centre but never found much use. I installed CentOS 6.5 in a software RAID1 configuration ...
3
votes
2answers
3k views

Strange error message during CentOS 6.5 installation regarding disk containing BIOS RAID metadata?

While attempting to use an old 40GB HDD to setup a kind of junky though usable Athon 1GHz system I ran into the following error during the HDD identification/partitioning phase of the installation: ...
4
votes
2answers
541 views

Is a ZFS storage array portable across operating systems & CPU Architectures?

I know that ZFS is available on variety of operating systems Solaris, Illumos, Linux, BSD etc. Suppose I have a bunch of disks that are part of ZFS raid file system that was created on Linux, could ...
6
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1answer
5k views

New md array is auto-read-only and has resync=PENDING

I've created a new md array with the following command: mdadm --create /dev/md1 -l 1 -n 2 /dev/sd[ed]1 But now /proc/mdstat shows the array as "auto-read-only" with resync=PENDING: ~ # cat ...
3
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0answers
255 views

What happens if I delete dmraid?

I am new to Linux and am trying to install Ubuntu 12.04.3 LTS from a live-USB and have it run alongside my Windows 7 installation. On the installation screen for Ubuntu, at the partition page, I get ...
2
votes
1answer
78 views

RAID mount not happening automatically

I've configured RAID array in my SUSE machine. Everything works just fine as expected. However, I need to mount the RAID array automatically when I boot my system. For this I added the mount point in ...
1
vote
1answer
451 views

RAID configuration disappears after reboot

I am using SUSE to install Hana in my system. I have 2 298 GB HDDs which I am going to configure as RAID 0. I am using mdadm to create a RAID array. I use the below command to create the RAID array. ...
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vote
1answer
108 views

raid array not mounted

I have configured RAID array in my SUSE machine using mdadm command. The /etc/mdadm.conf is fine and cat /proc/mdstat shows up the array and it is also fine. However, if I run the df -h command, it is ...
1
vote
1answer
40 views

RAID configuration file not present

I am trying to configure RAID disks in my SUSE machine. I have 2 disks currently. I am trying to configure them as RAID using the below command. mdadm --create --verbose /dev/md0 --level=stripe ...
2
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1answer
57 views

Linux installation in RAID

I am a fairly new systems administrator and I have to configure the RAID on a Linux machine. From my understanding so far, RAID is an array of multiple disks. I have some questions though. Question ...
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2answers
156 views

Are disks interchangeable in a mirrored RAID setup?

It is often written that disks in a mirrored RAID (like RAID 1) are an exact mirror copy one of another. So can I turn the machine off and simply swap the two harddisks cables? And if one of the two ...
3
votes
1answer
342 views

mdadm; previously working; after “failure”, cannot join array due to disk size

Abstract I had a functional Raid 5 array, I rebooted the box, and then mdadm couldn't re-assamble one part. Seeing that it was only one part, I thought it would be easy to just re-sync. But that ...
3
votes
1answer
2k views

recovery data from RAID and disk failure (Linux)

Some background A friend of mine was using in his office a NAS Buffalo-LS-WVL with two disks of 1TB each. It seems that the two disks were mounted as raid 1, but, as you will read, probably they have ...
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1answer
617 views

bootloader configuration with GPT, RAID1, and LVM

Using the GUID Partition Table and RAID 1, the bootloader (syslinux or GRUB) is not able to boot into the machine, which was installed with Arch Linux. First off, there are two drives identical ...
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1answer
55 views

Restored VG has shifted volumes

I'm recovering a PV on a mdadm RAID 1 with a single VG containing several LVs. The underlying devices have several bad sectors (one just a few, the other really much) and a silly typo made it ...
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0answers
93 views

error running raidctl on Solaris 10

I am trying set up a disk mirror on a Solaris 10 system. The two disks are identically formatted and not mounted. Neither is a boot disk. I ran the following: # raidctl -c c1t2d0 c1t3d0 ...
5
votes
2answers
476 views

RAID 5 with 4 disks fails to operate with one failed disk?

I found a question about mdadm spare disks which almost answers my question, but it isn't clear to me what is happening. We have a RAID5 set up with 4 disks - and all are labeled in normal operation ...