RAID solution handled by the operating system.

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How to install FlexRAID on Ubuntu Server 14.04.02 LTS (command line) [on hold]

There seems to be no documentation of how to install FlexRAID on Ubuntu Servers... Can someone please give me a link to a guide or at least a Linux storage pooling application?
4
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1answer
70 views

Can I stripe 2 volumes on the operating system drive?

I'm new to system administration and I'm not really sure if this is possible. Our server supports up to 4 x 2 TB drives. We need a drive larger than 2TB for a particular use. We also need redundancy ...
0
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1answer
21 views

Software RAID 1 does not extend on two new additional drives

I added two new devices two my software RAID 1 system. They are recognized by mdadm but I can't use the addition space. Here is how I proceed: I added the two new disk to my PC and created on each ...
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2answers
36 views

How to run fsck on software raid's real hard disks?

When and how should this be run? Is it better to boot from a DVD-ROM and run fsck on each real hard drive? Or can this be done automatically after X number of mounts?
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1answer
36 views

Remove a drive from a 2-drive RAID 5 array using version 1.2 metadata?

My situation is nearly identical to "How to remove a drive from a non-standard 2-drive RAID 5 array?", except my 2 TB RAID5 is using mdadm super block version 1.2. According to the best answer, ...
1
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1answer
25 views

Soft raid 1 slow (disk fail?)

I am running a server with Software Raid 1 and it is used solely for backup purposes using Idera/R1Soft. The last few days, the backups have been generated extremely slowly, so I am starting to wonder ...
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0answers
14 views

Data rescue for lvm-raid

i've had to change mainboard and CPU of my storage server consisting out of 6x1Tb devices. As it was operated by a Software RAID (dm-raid) i've thought plug and play. But then no bootsector was ...
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1answer
29 views

How to add a harddisk back in raid10 array?

I have a harddisk that is out of raid array. I wanted to create the partition table on sda basesd on the sdb table and I issued this command: sfdisk -d /dev/sda | sfdisk /dev/sdb --force I know ...
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0answers
19 views

One drive in Centos software raid 1 array keeps disappearing

I have a pair of HP DL320e servers identically configured with 2 x WD Red 6TB drives in a software raid 1 array. # cat /proc/mdstat Personalities : [raid1] md126 : active raid1 sda3[2] sdb3[1] ...
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1answer
35 views

How do I prevent Windows from presenting software RAID discs as a single volume?

Here's my issue: I had a server's software RAID fail. I don't believe it's the hard drives, as they are brand new RE drives from Western Digital and the RAID software said that 2 dives had failed. ...
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0answers
32 views

Software Raid: Array inconsistent state

I'm running software raid 1 with md on debian distro. One of the disks has failed, but not all of the raid arrays were at that time in a "fail" state. In order to bring them also in a fail state (in ...
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0answers
57 views

Unable to install grub to software Raid array in Ubuntu

How do you ensure Grub is properly installed on a software RAID array in Ubuntu? I have a failed RAID array on an Ubuntu 14.04 server. When I first tried booting it, the Grub screen came up, but ...
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1answer
96 views

CoreOS on software RAID with EXT4 filesystem

I'm currently thinking about installing the CoreOS on a bare-metal server with two disks I want to put in a software RAID1. The latest CoreOS is now using EXT4 as their default filesystem and I'm ...
0
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0answers
18 views

How to diagnose RAID drive showing incorrect size

I have a software RAID1 array on Ubuntu 14.04. Each drive has 1TB, for a logical size of 500GB. Suddenly, one drive started reporting it only had 4.1GB and I can no longer run any SMART self tests on ...
0
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1answer
44 views

How to fix destroyed software RAID after Ubuntu upgrade

I upgraded a headless server from Ubuntu 12 to 14 following the built-in do-release-upgrade script. It seemed to run fine until I rebooted, and was left with an unusable machine. After the grub ...
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4answers
137 views

mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?

Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...
0
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1answer
101 views

What are the Pros & Cons of Software RAID vs Hardware RAID of 4xSSD(512Gig) in RAID10?

I'm getting this server: Supermicro SuperServer 6018R-TDW It comes with this motherboard: Supermicro X10DDW-i I've decided going with 4xSSD(512Gb) in a RAID10. My server is busy with a demanding ...
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0answers
61 views

mdadm: activating spare and removing 'removed' disks

I added 1 disk to my raid array, started reshaping, and then remembered that I forgot to partition the drive. So I partitioned and readded the disk. I'd like to get rid of that 'removed' and activate ...
4
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1answer
76 views

Are my disks failing and causing high load on linux?

Today I did apt-get update && apt-get upgrade on Linux Ubuntu 12.04.5 LTS server. Everything went fine. Four hours later monitoring tools alerted me that disk I/O is overloaded. I/O wait has ...
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1answer
47 views

mdadm: drive replacement shows up as spare and refuses to sync

Prelude I had the following devices in my /dev/md0 RAID 6: /dev/sd[abcdef] The following drives were also present, unrelated to the RAID: /dev/sd[gh] The following drives were part of a card reader ...
0
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3answers
42 views

In a software RAID1, why does tune2fs -c 0 /dev/sda1 not throw an error but change is not seen in tune2fs -l /dev/sda1?

The Title pretty much says it all. Turn off mount count fsck seems to succeed: tune2fs -c 0 /dev/sda1 tune2fs -c 1 /dev/md0 But listing out via tune2fs -l /dev/sda1 shows mount count is set back ...
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1answer
52 views

Recover data from OpenBSD softraid down to a single disk

I'm currently very desperate: I have a 3TB WD Red disk that I need to extract data from. This was part of a softraid on an OpenBSD 5.6 machine. I was in the process of migrating to a zfs on linux ...
0
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1answer
53 views

How to fsck a partition that is part of a software Raid that again is part of a LVM volume group?

The faulty partition is /dev/sdb3. from /proc/mdstat: md2 : active raid1 sda3[2] 2896184639 blocks super 1.2 [2/1] [U_] says /etc/fstab: # /dev/md/2 belongs to LVM volume group 'vg0' ...
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1answer
1k views

XenServer 6.5 Software Raid

I try to install XenServer 6.5 with Software-RAID 1 at my home lab. With XenServer 6.2 this setup ran stable for a few months (at the same hardware). XenServer 6.5 installation went smoothly and ...
0
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1answer
57 views

Disk I/O at limit with software raid

whenever I use rm or cp on a bigger file structure the disk i/o is going up to the top, but not with the focus on cp or rm, it is the software raid sync. My knowledge in this area is limited. The ...
0
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1answer
69 views

Repairing RAID6 with two drive issues mdadm

I have had two disk failures on my RAID6 array. I have added two new disks and did the following: I ran mdadm /dev/md1 --remove on the two disks I set up my RAID on the 1st partition of each disk ...
3
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1answer
113 views

Best way to RAID 4 x Intel SSD 910 for PostgreSQL

I have a Linux (debian/ubuntu) server with 4 x Intel SSD 910 800GB pcie that I need to RAID together. The biggest problem with these card is that they give you 4x200GB drives that you cant ...
0
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0answers
32 views

Migrating linux (madm) RAID1 (mirror) to something else?

I have 2x 3TB in a mirrored RAID 1 volume. I would like to extend this to a 4x drive volume. I'd like to have 1 disk for redundancy. I'm no IO/RAID expert, or madm come to that, but know enough to ...
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1answer
64 views

How to migrate RAID-6 from 5 disks to 4 disks while increasing disk sizes

I am having a quite complex problem and while I found solutions to individual steps (and already applied some of them in different contexts), I am not quite sure on how to do the whole procedure ...
1
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1answer
31 views

Is it possible to update stripe-width on an existing, and used, ext4 fs?

I have a RAID 5 with 5 3TB drives (8 in few weeks), on a Debian. There is only one ext4 partition on it, using all the space available. Actually, due to origins of the RAID (4 drives), the ext4 fs ...
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1answer
52 views

Linux soft RAID6 how to identify last failing drive [duplicate]

I have a RAID6 array that had been neglected, and just had the third drive fail. I want to do a ddrescue of the last drive to fail to try to recover the RAID, however I don't know how to identify ...
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1answer
34 views

Raid-5 Linux Software array, 3 drives “removed”

I have a raid array with several drives marked as removed. I want to add them back in, but am not sure how to do so. [root@tera2 ~]# mdadm --detail /dev/md3 /dev/md3: Version : 1.2 ...
3
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1answer
63 views

One disk of a software RAID10 was repartitioned. What to do?

I have a software array in one machine root@c ~# mdadm --query --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Mon Mar 17 10:22:38 2014 Raid Level : raid10 Array Size : ...
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2answers
181 views

SW ZFS vs. HW RAID controller

I run a FreeBSD 10.1-RELEASE webserver, and I have 2 sata HDD on a HW RAID1 controller, but when I installed the OS, it won't do it on a ZFS filesystem (for mirroring as I intended to) but I was ...
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0answers
26 views

Not sure how to change primary partition size and add a new partition on a software RAID1 using mdadm, as well as parted or fdisk?

I'm trying to create a /data partition to run drbd. However the drbd guide only shows steps for an fdisk on a normal disk, and not mdadm software raid. So I have sda3/sdb3, which are holding ...
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1answer
107 views

LSI MegaRAID 9240-4i & RAID1 (mirroring) on ZFS filesystem

Exist any incompatibility between an existing virtual drive created on LSI MegaRAID 9240-4i SAS/SATA Controller with RAID1 and the ZFS filesystem? I tried to make mirror(2xSATA HDD 300Gb) on freebsd ...
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votes
2answers
79 views

3disk in raid 1 using half/half

Im using a mdadm software raid system on my new server which runs 3x120GB ssd drives. Currently, this is the preinstalled configuration that came with the server cat /proc/mdstat Personalities : ...
0
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1answer
106 views

Ubuntu Software RAID 1 with NTFS weird volumes on RAID Array

I'm trying to mirror two secondary 2TB HDDs with RAID 1 with 1 big NTFS partition and am coming cross something that looks weird to me, although it could just be my complete ignorance because this is ...
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1answer
245 views

Recovering a RAID5 with 2 disks out of the array

I don't want to approach this in a trial-and-error manner as I know this is the best thing to do if I want to loose my data. I have a server with 4*2TB disks in RAID5 (yes I know it's not wise) on a ...
0
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2answers
103 views

How can I force soft raid to read only from one disk?

I have quite a large IO wait showing in top. I suspect this is fault of SDA drive (on of 2 disks in RAID array), which was replaced about week ago. There are no errors visible, smart showing nothing, ...
0
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2answers
28 views

How do I list which drives are part of each RAID array?

I have a linux software RAID using md. I want to list all of my RAID arrays and each hard drive attached to them. Is there an easy way to do that?
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0answers
38 views

Software RAID0 on ephemeral storage for Server 2008 on boot

I have a c3.large instance which I would like to run the two ephemeral drives in a striped raid configuration. I am able to do this via command line and the disk management msc, but I have not been ...
3
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2answers
299 views

Software RAID 10 not any faster than s/w RAID 5 on Ubuntu 14.04 box, why?

We are doing some tests on a new database server with 4 x 240 GB SSD disks. From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy. However when ...
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0answers
26 views

Improve read performance on ext4 on Centos with software raid1? [duplicate]

I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions: # df -h Filesystem Size Used Avail Use% ...
0
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0answers
65 views

Windows Server 2008 R2 - Problems after degraded software-raid

After a harddisk-crash the server will start from "secondary-plex" - but becomes unusable: -> Boot -> Login as Administrator -> Desktop is ready -> Try something to open: nothing will work and the ...
3
votes
1answer
60 views

When does a Raid restore redundancy after a broken sector is flagged as defective?

What happens when I flag a sector on a hdd in a RAID setup as `defective (GLIST) ? Will the data be written to the replacement sector right away or does this depend on the actual setup/settings ...
2
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2answers
393 views

Is there a way to force a TRIM in a Windows 2012 Software RAID array?

I have a Windows 2012 server configured with two SSD under a Software RAID 1 (controlled by Windows), under that configuration the optimization tool is not supported. Is the TRIM still ...
2
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1answer
1k views

How can I coax RHEL / CentOS / SL 7 into booting normally with degraded software RAID 1

I set up a new server (my first with this version of Linux). I installed a pair of 160 GB blank SATA HDDs (one Seagate and one WDC, but with exactly the same number of LBA sectors) in an old machine, ...
0
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1answer
77 views

Reconfigure (software-RAID) array for more space

I have: Windows Server 2012 with Hyper-V and 2 VMs x6 hard drives 500 GB capacity in software-RAID array (Window's Storage Spaces) for VM storage, x1 SSD boot drive for server host OS (and VM page ...
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1answer
55 views

Filesystem (or another use) for totally unreliable, old hard disks on a Linux system [closed]

I've got a couple of disks lying around which are small in capacity and old enough to be considered spinning spinning rust, my gut instinct is to not trust them, but the damn things still work. ...