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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How to find the device in a RAID1 under Linux?

besides: head -2 /dev/dm-16 | strings | grep ^id how can I find that which device belongs to a given MD RAID1 array?
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2answers
81 views

What is a good way of layering zfs filsystems to manage unpredictable future workload that doesn't severely compromise performance?

I've been playing around with ZFS and using sparse files as virtual devices to learn how to use the zfs tools. It seems that there isn't much of a hit in performance by creating a raid pool out of ...
2
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2answers
217 views

Can I create a 2 TB RAID-1 array out of one 2 TB disk and two 1 TB disks while preserving 1 TB of data?

I currently have 1 TB of data on a RAID-1 mdadm array. This array consists of one 1 TB disk and a 1 TB partition on a 2 TB disk. I have now bought a second 1 TB disk, and I would like to use this to ...
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1answer
88 views

Reusing older raid discs

I have a software RAID5 array (Linux md) on 4 disks; the OS is OpenSUSE 12.3. Recently I replaced a disc with a larger one (fail disc, remove it, add new disc). The capacity of the array has not yet ...
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2answers
164 views

Can one use a md-type raid-0 as a drive for zfs pool

I want to play with ZFS at my CentOS. At the moment I have two 750Gb drives and two 400Gb spare drives that I could use. Of course the simplest solution would be to take all of them and use only 400Gb ...
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2answers
313 views

erased md0, md1 and can't recreate them

I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1. I need to set them up again. When ...
2
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1answer
203 views

EBS Volumes Mounted On Wrong Directory After Reboot

I have three EBS RAID 10 volumes in my /etc/fstab on an Amazon AMI hosted with AWS/EC2... Everytime I reboot the instance, the volumes get mounted to the wrong mount points. Any ideas on how I can ...
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1answer
200 views

How do I increase my root volume

I have a server using software RAID (raid1) and I need to increase my volume on my root partition. I've been googling around with no luck of finding out how I can do this. I have 2x1TB RAID1. My df ...
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0answers
291 views

Linux won't install on RAID set: disks “contain BIOS RAID metadata, but [are] not part of any recognized BIOS RAID sets”

I plugged a Q-Tec 340R ATA-133 IDE RAID card, with two IDE connectors and support for up to four IDE drives, into an old P4 machine, attached two hard drives and managed to set up RAID0 and install ...
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2answers
118 views

RAID on USB stick

I have a USB stick that's showing some weird problems. I'd like to create a number of partitions (3?) and use RAID over those partitions to ensure resilience to failure. Is this a good idea? How do I ...
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1answer
118 views

Does CentOS 5.9 need Grub to run on hardware RAID?

I'm doing a fresh install of CentOS 5.9 x64 on a server with 8 disks in RAID5. At some point during the install, it gave me the option of configuring Grub, or not bothering. I chose not to bother, ...
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1answer
1k views

No /etc/mdadm.conf in centos 6

I have installed centos 6 and setup a new RAID array with two disks. every thing is ok and I have partitioned the array but I don't see any /etc/mdadm.conf or /etc/mdadm/mdadm.conf files. I have ...
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0answers
522 views

Install Kali Linux on RAID0 (as dual boot Windows 7 & Kali)

I’m currently trying to install Kali Linux on my laptop as described here. The problem is I’ve a laptop (MSI GT70) with a Raid 0 (2x 500Gb) and Windows 7 installed on it. At the point where I’ve to ...
7
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1answer
6k views

How to mount a disk from destroyed raid system?

I have a horrible situation where I have to restore data from damaged raid system in a rescue Debian Linux. I just want to mount them all to /mnt/rescue in read only modus to be able to copy VMWare ...
2
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1answer
187 views

Making two drives show as one on debian?

I rented a server from a provider and they won't install RAID0 without an additional fee. So I'm trying to figure out how to link these two drives so that my programs that are installed on the hard ...
3
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1answer
203 views

How to remove disk from RAID1 without knowing the /dev/XXX name?

BEFORE: SERVER:~ # mdadm --detail /dev/md5 /dev/md5: Version : 00.90.00 Creation Time : Fri Mar 18 14:53:33 2011 Raid Level : raid1 Array Size : 67103360 (63.99 GiB 68.71 GB) ...
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1answer
316 views

cleaning /dev/md0 filesystem ( raid)

I have a CentOS server using raid. The /proc/partitions contains: major minor #blocks name 8 0 976762584 sda 8 1 104391 sda1 8 2 921600855 sda2 8 3 55054755 ...
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1answer
52 views

Can I put 2 disks into a raid-0 array without reformating the FS?

We have an existing /dev/sda disk, we are adding an identical /dev/sdb I want to place these two disks in a raid-0 array. Can I do that without reformating /dev/sda?
0
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1answer
166 views

Can I configure software RAID on an existing server without losing the existing partition?

I've got an existing server with 1 disk and Ubuntu 12.10 installed and running. I want to add a 2nd disk and configure RAID 0 across the two disks using Ubuntu's software RAID. Can I do this ...
0
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1answer
199 views

USB Drive Software Disk Mirroring - Is this the right approach?

I have a 1TB NTFS USB Data Drive (no boot, etc...) that I would like to keep a mirror of as a backup in case of hardware failure. It is always connected to my raspberry pi running the raspbian ...
4
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3answers
1k views

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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0answers
501 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
3k 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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0answers
446 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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0answers
276 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 ...
0
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1answer
179 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 ...
0
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3answers
531 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
451 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 ...
2
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3answers
2k views

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 ...
0
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2answers
347 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 ...
4
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2answers
136 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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2answers
414 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
357 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 ...
1
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0answers
157 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 ...
1
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1answer
193 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 ...
2
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2answers
928 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 ...
0
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1answer
229 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
267 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 ...
1
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1answer
433 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 ...
1
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2answers
308 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
votes
1answer
631 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
327 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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0answers
457 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 ...
2
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1answer
3k 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 ...
1
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1answer
116 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. ...
0
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1answer
160 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 ...
3
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2answers
499 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 ...
4
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1answer
450 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 ...
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1answer
3k 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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2answers
5k views

Whats the difference between mdadm state “active” and state “clean”

I 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 is ...