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1
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1answer
19 views

Clone installed system by using the hardware RAID 0+1 synchronization

Alright, following setup: 2 identical machines (DELL Power Edge T320) with a hardware raid. one machine is running for a while now, one machine hasn't even been set up at all The running machine ...
0
votes
1answer
35 views

RAID Level 5 versus Level 1

Is it slower to write one block in RAID Level 5 with 5 disks than RAID 1 with two disks (mirroring only)? I think No since with Level 5 you are writing the data and the parity (two writes). With Level ...
3
votes
1answer
38 views

Recover data from raid 1 when both drives are faulty

I had a RAID 1 on my server, and apparently both of hard drives have failed at the same time. Server support did a quick check to confirm that HDDTEST-W1F21M6K ERROR Finished (Selftest, Device: ...
2
votes
2answers
209 views

Rebuild RAID1 from existing disk, and add another

This question is a problem derived from solving another problem that you can see on this thread. To make it short, my dedicated server has a RAID1 array with 2x3TB HDD. A week ago, one of them ...
1
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1answer
141 views

Removing failed disk from raid 1

my server (Debian Wheezy) has a failed disk. I have sda and sdb and according to the support of my hoster, sdb needs a replacement. I send them this information with the mdstat: ...
2
votes
1answer
552 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 - ...
3
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0answers
89 views

LVM RAID 1 for root [closed]

I have LVM RAID 1 (not mdadm RAID 1, but exactly LVM2 RAID 1) for my root partition. I would like to make my system boot without either of the HDDs where the underlying PVs of the root LVM partition ...
1
vote
1answer
286 views

Performance of RAID 1 with 3 Disks under Linux

The standard way to setup a RAID 1 under Linux is to use two disks of the same size. The write performance is almost as good as with a single disk drive. The read performance can be up to twice the ...
6
votes
1answer
244 views

md raid1 ext3 and 4k sectors slow with directory operations

I recently moved from a hardware RAID1 enclosure to using two eSATA drives with md. Everything seems to be working fine, except for the fact that directory traversals/listings sometimes crawl (on the ...
2
votes
2answers
141 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 ...
2
votes
1answer
374 views

Kernel failure with software RAID-1 due to single drive read errors

I am running Fedora 19 (kernel 3.11.3-201.fc19.x86_64) with a software RAID-1 (mdadm) setup on two identical Seagate 1GB drives: # cat /proc/mdstat Personalities : [raid1] md1 : active raid1 ...
1
vote
1answer
240 views

Ubuntu Server - OS on single HDD, file server on software RAID 1

I run a Windows Server 2008 machine. It is used as a file server (File Services feature), in addition to local shares I use CrushFTP for SFTP and HTTP access to my files. I would like to convert to ...
4
votes
4answers
1k views

Monitor disk health using smartd (in smartmontools) on a high availability software RAID 1 server

I have a server with three identical SATA/600 3TB drives: /dev/sda, /dev/sdb, /dev/sdc. The drives are partitioned, using GPT with three partitions each: 1 MB: Reserved partition for boot loader 1 ...
1
vote
1answer
64 views

Can't swap between two bootable drives

I'm attempting to setup a 2-drive (sda, sdb) RAID 1 in my PC, using Raider to convert from my old single drive (sda) system to the new RAID 1. From sda, on sdb I ran: # raider -R1 # raider --run ...
1
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2answers
253 views

Setting up a RAID 1 in Funtoo [closed]

In short Following the guide How to Set Up a RAID 1 Under GNU/Linux, I have setup a RAID 1. Checking the RAID Array for validity in various ways, appeared to be normal. However, after rebooting the ...
3
votes
1answer
860 views

mdadm - Accidentally ran “mdadm --create” on an existing raid-1. The superblock is now corrupt and I am unable to recover data. Did I bork my data?

I have /dev/sdb1 and /dev/sdc2 that were previously setup into a RAID-1 with mdadm, but then I reinstalled and lost the old configuration. Out of idiocy, I ran sudo mdadm --create /dev/md0 --level=1 ...
0
votes
2answers
318 views

Need to Break RAID 1 on Linux Server

On one of our server Hardware RAID1(mirroring) is configured. Now we need to break the RAID1 and simply use the other Hard disk separated from RAID to extend the LVM on that server. Can some one tell ...
0
votes
2answers
419 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 ...
1
vote
1answer
205 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
votes
1answer
704 views

convert /dev/md0 to /dev/sda1

I used a Software-RAID I and want to access the data without RAID now. After mdadm --fail /dev/md0 /dev/sda1 mdadm --remove /dev/md0 /dev/sda1 I tried mount -t ext4 /dev/sda1 /mnt but dmesg ...
1
vote
2answers
348 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 ...
2
votes
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 ...
2
votes
0answers
86 views

Ubuntu 10.04 LTS hangs at 43% of preparing to partition raid 1drives

I have set up hardware raid 1 with two SAS drives using the Adptec 6405E controller. I am having a problem when installing Ubuntu 10.04 LTS as it hangs at 43 % when partitioning disk drives. So far ...
3
votes
2answers
139 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 ...
2
votes
1answer
373 views

“error: no such device” at boot in Ubuntu Server 11.10 with Raid1

I have a configuration of 4 HDD's as Raid1 2 pairs of 2 HDD's. First Raid1 pair is for system, so I just made an 40GB space for swap, and the rest of it for the root, the second pair of Raid1 is for ...
4
votes
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 ...
3
votes
1answer
515 views

What are the advantages of swap on a raid-1 (mirror) device?

What are the advantages of swap on a raid-1 (mirror) device? (in a server environment running linux) I mean, you can just use multiple disk devices in linux for swap. And with swap devices that have ...
6
votes
1answer
10k views

mdadm raid1 and what chunksize (or blocksize) on 4k drives?

I want to use two 3 TB drives in a mdadm raid1 setup (using Debian Sequeeze). The drives use 4k hardware sectors instead of the traditional 512 byte ones. I am a bit confused because on the one hand ...
6
votes
5answers
5k views

Backup whole hard disk Linux

I am looking for a method to backup a whole disk in case something is screwed up... I don't even know what to install on some special devices of the server, and every time it is not the same. ...