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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Partitioning EFI machine with two SSD disks in mirror

I have two SSD disks, I want to put them in a software mirror RAID. But whatever I do the OpenSuSe installation keeps telling me that due to the partitioning scheme he won't be able to install the ...
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794 views

How do I set up raid0 using extra two drives (not the install drive)?

I have been looking around online for a suitable tutorial to help me set up a raid0 across two (or more) drives, but not moving the actual installation of Mint onto that raid setup (I have that on a ...
2
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2answers
6k views

Change Partition Table with GParted

I have an Ubuntu 12.04 LTS server that has 6x600GB SAS drives in a RAID 5 configuration (Perc 6/i). The partition scheme looks like this: Partition File System Mount Point Size /dev/sda1 ...
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609 views

Installing 12.04LTS Server on a Fake RAID10

Scenario Install Ubuntu 12.04LTS Server on a RAID10 with boot on a RAID1. 4 - 2Tb SATA Hard Drives 3 Partitions (/boot, /, and swap) boot (256Mb from each disk) setup in RAID1 /dev/md0 partition ...
2
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454 views

Disable RAID auto detect at runtime

In Linux, I'm partitioning two disks for RAID1 with fdisk. The first disk partitioning succedes, but the second fail because the raid starts automatically and occupy also the second disk (why? it ...
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1answer
223 views

Fresh installation of debian and raid10 array with SSD and HDD

I have one 120Gb SDD and four 2Tb HDD at disposal. I would like to install Debian Squeeze on the SSD and create a software RAID10 array with the four HDD. According to your experience, how to ...
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3answers
810 views

Automatically run kpartx during boot

I'm running Debian Wheezy on an SSD, and in addition I have two 500GB hard disks in Intel software RAID 0 (fakeraid). Both the SSD and the RAID array have GPT partition layouts. I have set up my fstab ...
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1answer
718 views

RAID 1 + 0, Solaris 10

I create the meta devices: metainit d102 1 1 /dev/dsk/c1t2d0s6 metainit d103 1 1 /dev/dsk/c1t3d0s6 metainit d104 1 1 /dev/dsk/c1t4d0s6 metainit d105 1 1 /dev/dsk/c1t5d0s6 then I make the mirrors ...
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3answers
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Can I create a software RAID 1 with one device

I have a single disk that I want to create a Mirror of, Lets call this disk sda I have just bought another identicle size disk, which we can call sdb. sda and sdb have one partition called sda1 and ...
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2answers
664 views

Can disks be accessed independently in a RAID-1 volume?

I want to create a RAID-1 array with Debian 6. This array will contain 6 disks, 3 for the OS and 3 mirrors. I used this RAID before but on windows, and maybe I didn't do it good at all, because I ...
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2answers
150 views

Where did 47gigabytes of space go?

Clean installation od Debian squeeze 6.0.6 x64 on intel atom 230, with 3 HDDs, with 3x500GB. df -h shows : datastore size used free % mounted /dev/md0 917G 909M 870G ...
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3answers
611 views

Atom 230 + 2GB RAM datastore for small server = 64 bit or 32 bit debian

would you recommend me for small debian linux with small apache, small mysql and primary datastore with SW RAID 5 just 32bit debian or rather 64bit and why? I have only 2 GB of RAM, so could that be ...
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2answers
639 views

Can I mount a microsoft mirrored dynamic disk?

I'm testing out sw raid in windows 7, but I almost always use linux and I would like to know if it's possible to mount such a mirrored dynamic disk. I can already mount each members separatly but ...
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0answers
188 views

What chunk size for KVM under Debian linux is optimal with RAID 5?

I would like to know, how to set optimal chunk size for my debian squeeze in future. I Work with 3x WD RE4 500Gb 7200RPM in SW-RAID 5, under debian squeeze. (in the future maybe under wheezy) I Saw ...
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1answer
225 views

How to rebuild a two drive raid 1 array on Linux?

I need to rebuild a two drive (160x2) raid 1 (mirror) array. It was an Intel raid from a 7 year old Dell computer (Windows). Both drives are assumed to be functioning. The raid was created with an ...
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2answers
1k views

Very slow SW-RAID 5 in Debian Squeeze

I don't know why, but I have big trouble with speed of my raid. I have 4x WD RE4 7200RPM 500GB. Size of RAID 5 is 1000GB. 1 of HDDs is Spare. Problem is here: Every 1,0s: cat /proc/mdstat ...
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1answer
406 views

SW-RAID 5 - how much CPU time and performance can it take?

I have Debian squeeze 6.0.4, 4x WD RE4 500Gb 7200RPM, Athlon II X4 600E and 24GB RAM DDR3. Since I work with SW raid 5, it takes much more CPU, than I think is enough. How can I get know, how much ...
2
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1answer
411 views

IO Error on RAID5 member. What to do about bad blocks?

I recently got an IO Error on one of my RAID5 members; on a 3 disk fakeRAID array. I didn't notice at the time - there was only a message in /var/log/kern.log - so I had continued running the machine ...
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1answer
593 views

Complete install on RAID1 + LVM

When doing a complete install of Linux is it possible to install everything including /boot on 2 software RAID 1s (4 hdds) + LVM? I haven't been able to figure out whether this is definitely ...
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2answers
453 views

Can't remount local file systems for read-write (RAID1)

I assembled a new machine on Asus P9X79 motherboard, using its RAID controller to create a RAID1 array of two 500Gb drives. When booting Arch from an external drive I am able to work fine with ...
4
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1answer
990 views

Unable to mount raid on my NAS, trying to rescue the data, how should I proceed?

A short backstory: something happened on my Synology NAS, apparently a buggy mailserver program that came with an update stopped the device from seeing the 2x3TB drives I have. After a lot of ...
2
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1answer
575 views

Ubuntu Software Raid5 - /dev devices changed, will mdadm raid break

I had a major server failure. The OS is fine and back up and running. Before I plug my raid drives back in and try and mount it I need to ask this simple question. The drives that originally mapped ...
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728 views

Bad superblock after server crash

My server (CentOS 6) crashed, and it now kernel panics on boot. It's currently using a mdadm RAID1 array with two 1TB drives. vg_server2422-LogVol01 is / vg_server2422-LogVol00 is Swap ...
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1answer
4k views

How to set up disk mirroring (RAID-1)

I have a computer with two WD 1TB drives and I want to configure disk mirroring on it. I tried setting up RAID during the installation by creating RAID partitions but that does not work for me. Is ...
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1answer
183 views

ServeRAID error in syslog, is it important?

I was checking the logs in server when i came across this message. Nov 4 12:52:05 SERVERNAME ServeRAID Manager Agent: [338] Periodic scan found one or more critical logical drives: controller 1. ...
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1answer
194 views

RAID disk lost in just one machine

I have a Blade Center H and a DS4700 SAN. Today we detected one problem in the mail service in one of the blades. It can't see a particular volume available in the SAN. All other blades can see SAN ...
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2answers
754 views

Linux software RAID-1 and device name

I want to set up software RAID-1 on my Ubuntu system, and found this example of an /etc/raidtab: raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 ...
5
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1answer
655 views

Alternatives to LVM

I was thinking about alternatives to combine several HDDs together. The only options I know so far are using LVM and/or RAID. The thing is, using LVM, I will most probably lose all data, if one ...
2
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1answer
5k views

Raid 0 Linux Installation fails to install grub

I have a Raid 0 setup (striping) via BIOS not through software raid. When I install linux mint or Ubuntu it fails to install the boot loader or set the boot loader to boot. I get an error stating ...
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What's the difference between mdadm state “active” and state “clean”

I have two different computers with different RAID5 arrays. When I run the command mdadm --detail /dev/md0 one drive reports "active" while the other reports "clean" for the "state" field. What ...
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1answer
517 views

Migrating from hardware to software RAID

I have an old PCI-X controller running 8 drives in RAID 5. I'd like to dump the controller and go to software RAID under Ubuntu. Is there a way to do this and retain the data from current array? ...
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2answers
154 views

RAID Lag-Behind Burst Write

I would like to setup RAID1 so that a ramdisk in the RAID configuration has occasional synchronisation with a physical disk (that is very battery intensive to run, so I hope to let it spinout). Is ...
4
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1answer
148 views

ext4 directory lists as a file

I'm working with a large (8TB) EXT4 filesystem in linux. After a power outage, the filesystem wouldn't mount. fsck is taking weeks to complete, but i ran testdisk and i'm able to see my partition ...
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221 views

Dual/Triple Booting with dmraid and non-raid disk

I currently have 3 hard drives in my computer The first two disks are in a RAID-1 array, using an Intel P55 chipset, and accessed through dmraid, with the third drive partitioned like so: Filesystem ...
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1answer
2k views

How do I know that a /dev/dm-XX device isn't used by anything on SLES 10.4 (64bit)?

I have a device that I can see in the output of fdisk -l: /dev/dm-XX (XX is a number.) How do I know that I can use this /dev/dm-XX to add it to a RAID1 array? How can I be 100% sure that nothing ...
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1answer
2k views

RAID 10 can not be started

I have a RAID 10 array managed with mdadm which has failed . The symptom was that X has crashed and I was unable to logon from the terminal. I have restarted the computer and /dev/md1 did not start. ...
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326 views

Media server RAID difficulties (on FreeNAS)

Disclaimer: I've never used FreeNAS or any type of RAID before, so this is a first. I've decided to build a media server in my new apartment. I'm going to be going with a total 10TB of space (6x2TB ...
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0answers
338 views

Software raid checksumming slow

On my new 24 disk array I get 900 MB/s of raw read or write using dd to all the disks. When I set the disks up as a 24 disk RAID6 I get 400 MB/s write and 600 MB/s read. It seems to be due to ...
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3answers
5k views

Mounting multiple devices at a single mount point on Linux

Is there a way to mount multiple hard drives to a single mount point? Let's say I run out of space on /home and decide to add an extra hard drive to the computer. How do I scale the space on a mount ...
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1answer
3k views

Linux: LUKS and multiple hard drives

I have a Debian Linux system (amd64) installed on a RAID-1 system encrypted device (LVM on LUKS) and will have a RAID-6 of >=4 disks where I'll put my data (LUKS and maybe LVM). I think the basic ...
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2answers
669 views

Software raid + separate partitions?

I have setup software RAID1-arrays using two 250GB harddrives. There's two arrays - one named md0 in which the system is kept and the other, md1 works as swap: # cat /proc/mdstat md0 : active raid1 ...
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3answers
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How to check mdadm raids while running?

I'm starting to get a collection of computers at home and to support them I have my "server" linux box running a raid array. Its currently mdadm raid1, going to raid5 once I have more drives (and ...
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1answer
2k views

Why does btrfs allow to create a raid1 with mismatched drives?

I'm creating a btrfs using sudo mkfs.btrfs -m raid1 -d raid1 <small-disk> <large-disk> or sudo mkfs.btrfs -m raid1 -d raid1 <large-disk> <small-disk> it creates the fs with ...
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1answer
1k views

Interpreting tiobench results

I'm running tiobench on my raid1 and it gives me the following results. Why is there ##### shown instead of throughput? Why does seq.reading with 8 threads use 2836% CPU? My results: $tiobench No ...
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1answer
280 views

Raid5, what could happen? Partition corruption, now what do I do?

First, I probably deserve this for not having a backup. My system was installed with Debian and Mint11. I recently installed Mint12 to play with. I expected all three to continue to work. I can no ...
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2answers
141 views

View Files from mirrored RAID outside the device

The Product I have is a Western Digital My Book The device has stopped working but there is nothing wrong with either of the two mirrored drives. I would like to take out the two mirrored hard ...
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3answers
1k views

Is creating a sparse image using dd appropriate for backup/restore from a RAID?

I have two non-networked servers, each with 1.2TB of storage in a RAID5 config on an LSI MegaRaid 9240-8i controller. I have been trying without success to get Symantec Ghost to image one machine to ...
3
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3answers
1k views

Avoid pause during dm-raid initialization

On my CentOS 5 workstation I get a few seconds wait after dm-raid45 has been loaded ("Initializing Driver" or something like that). This seems to be part of the initrd. After that the system boots ...
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3answers
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Using mdam --examine to write mdadm.conf

I'm trying to script the RAID setup for a (growing) number of identical servers. The advice I've seen for using mdadm suggests that once the RAID array has been created you can run mdadm --examine ...
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1answer
333 views

is it possible to recover a raid 5 array by using usb enclosures?

I had a RAID 5 (Linux software RAID) server which recently decided not to boot anymore. It seems to be a motherboard problem possibly due to not being protected by a UPS during a power failure. It ...