RAID solution handled by the operating system.

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Is it safe to disable write barriers for mdadm RAID?

When configuring RAID 1 or 10 with mdadm, is it safe to disable OS write barriers (with barrier=0 or nobarrier)? As there is no writeback cache memory on software RAID.
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8 views

How do mirrored virtual disks get distributed in a 4 disk storage pool?

I have a Windows 2012 R2 server with 4 3TB drives. I had to upgrade after one of my JBOD disks failed and luckily I had backups to recover from my storage pool of 2-3TB and 2-1.5TB drives with 4 ...
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15 views

Installing Ubuntu Server on Raid 1: FakeRAID [closed]

I am installing Ubuntu Server 14.04.2 - amd64 in RAID 1 on my system with the following specs. SPECIFICATIONS: ASUS H97M-E 4GB 1600MHz RAM i3-4160 2 x 3TB Toshiba However, I failed ...
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1answer
28 views

Drop in write performance when mirroring two RAID 0 arrays

On a CentOS 7 server with 4 SSDs, I created two RAID 0 arrays with mdadm. Both were formatted with ext4 and mounted on separate directories. I benchmarked them using fio and got the following results ...
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2answers
51 views

JBOD server for ZFS without dedicated boot drive

I am looking at buying a cost-effective machine for using openAttic, which is simply Ubuntu 14.04 64bit with ZFS. The server I am looking at gives me 8 bays of 3.5", where I plan to put SAS 7.2k ...
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30 views

mdadm scaling beyond 6 disks w/ ssd's

It seems Linux mdadm produces less writes & iops as more disks are added to an array. For example, I have tested the following configurations, with the defaults aside from changing the I/O ...
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2answers
32 views

Can the type of a previously created ZFS pool be changed?

I have a 2-drive zfs pool created in mirror mode. Now I've managed to get my hands on a third drive, and I was wondering if I could add the drive, and change the pool type to raidz, which is pretty ...
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27 views

Confusion on how to hotswap dm-x device in software raid

Below is the dump when I do lsblk cat /proc/mdstat lmsetup -ls. So sde is dying and I would like to replace it. What i'm confused is, in lsblk it shows sde is part of md3 (software raid). but when I ...
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1answer
24 views

Firmware RAID5 and SED on Linux

I have three HDD's (Seagate ST4000NM0053) in a RAID5 set-up using firmware RAID (RSTe 4.0, Intel® C612 chipset) on Debian 8.4. They are SED, so I would like to set the ATA password. Unfortunately, my ...
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25 views

How to backup and restore with tar in a software raid 10 configuration?

I've successfully backed up and restored using tar with VPS that were not raided. Now I have a setup at my residence that requires raid, specifically raid-10. If I attempt to restore the tar it fails, ...
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1answer
58 views

Converting to Hardware Raid from default Software Raid, backplane 1 connector A0 is not connected Issue.

I have a newer Dell R330 server that came with three 128GB SSD's as well as a software raid S130. After setting up a Raid 1 with single hot spare, I realized that ESXI is not fully compatible with ...
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22 views

Can I increase the read error threshold on Linux software raid?

I have a two RAID 10 volumes where only one partition on /dev/sda was kicked out of one of the two volumes. Here's /dev/mdstat (in the middle of recovery): md1 : active raid10 sda3[4] sdd3[3] ...
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0answers
15 views

Does mdstat showing very different block sizes for identical drives indicate a failing drive?

One of my servers has a RAID1 array composed of two 240GB SSDs. It is managed/controlled via Linux, not via a hardware card. Recently, for no apparent reason, the array needed rebuilding. I rebooted ...
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0answers
20 views

Linux softraid showing failed drive, but smartctl shows no errors

I have a RAID6 array that is offline (shows 3 bad drives): cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md2 : active raid6 sdh1[11] sdg1[10] sda1[0](F) sdm1[9] sdl1[8](F) ...
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1answer
70 views

Server 2012 R2 — Using Storage spaces with hardware RAID?

I'm studying for MCSA using Server 2012 R2. I'm running a Dell r610 rack server with a perc6/i controller for hardware raid. Hardware raid is set up with a virtual array in a RAID 10 configuration. ...
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2answers
54 views

Can I setup Raid 1 after the system is already running

I just finished installing owncloud server using centos 7. My data is located at /var/xxx and I dedicated the hard drive/dev/sdb just for this /var directory. After a while, I decided that I wanted to ...
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27 views

Does anyone have experience with XenServer 6.5 with software raid 1?

I have successfully installed software raid on Xen Server 6.5 and I'm about to move a VM from ESXi to Xen due to benefits of raid 1 for a development server. Does anyone have any kind of experience ...
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1answer
34 views

Can I move a software RAID5 array from one system to another system?

I am running Ubuntu 14.04 LTS on both systems. They reside on the same computer. Initially I had the system running with the OS and GRUB installed on the RAID volume (3 disks). Next I wanted to test ...
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1answer
30 views

Raid device on rename appended with _0

I am creating various raid configurations. When I create a raid device say 5 with 3 disks mdadm --create /dev/md/md5 --level=5 --raid-devices=3 /dev/sda /dev/sdb /dev/sdc It does create a device ...
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1answer
33 views

Should I expect both disks in my RAID1 array to fail at about the same time?

I have an Ubuntu server with two HDD drives in a software RAID1 array. These are identical drives, and I'm assuming they're seeing the same level of read/write activity over their lifetimes (correct ...
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1answer
45 views

raid0 (soft-RAID using Linux md drivers) hosting XFS: how to repair after replacing bad disk?

So the latest configuration of our Nova compute nodes are using raw /dev/sdX devices (no labels nor partitions) as components for an md0 (raid0) array on which they're hosting an XFS filesystem. When ...
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1answer
34 views

Is it a good a idea to create a fake raid 1 for guest on ESXi?

I have an old server with software raid and I would like to install ESXi with 2 hard disks. I have read that I can install a guest (i.e. Ubuntu Server) and add two hard disks in different datastores ...
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4answers
889 views

Why does a raid 10 device need to be initialized?

When creating a linux software raid device as a raid10 device, I am confused why it must be initialized. The same question applies for raid1 or raid0, really. Ultimately most people would put a file ...
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1answer
114 views

Poor performance with Linux software raid-10

I have a machine with an 8 channel LSI SAS3008 controller chip, and individual drive testing shows I can write to any disk or all disks at between 174 MB/sec and 193 MB/sec with a sustained write ...
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1answer
193 views

Is it possible and wise to put the grub bios partition on a software raid?

in a two disk setup /dev/sda /dev/sdb i created per disk 3 partitions bios_grub 1mb linux raid 512mb md0 (/boot - ext3) linux raid rest md1 (physical volume for lvm) the answer on ...
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1answer
48 views

Cannot mount partitions from LSI Software MegaRAID

I have a ThinkServer RD440 running RHEL 7.2 with a LSI MegaRAID which is configured as a RAID 10 over 4 disks. It is configured on a partition level, not the raw disks. The root partition is not part ...
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1answer
19 views

recover original file system from raid6 iso's

I started with 5 drives. 1 has failed (i.e. fails to communicate anything) and 2 more are returning read errors. My plan is to use ddrescue to store the 4 working drives to iso files. After this I ...
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1answer
38 views

linux software raid10, identical machines, wildly different results

I am having wildly different software raid10 performance and behavior on two otherwise identical machines. I have two machines which are hardware identical, bought at the same time, with the same ...
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0answers
38 views

rsync ionice softraid - limit io locally?

I know this seems to be a recurrent question but it's been troubling for a while now, so if anyone has a brilliant idea please let me know. My Setup OS Debian Wheezy HDDs 2 x 240GB SSD for ...
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6answers
4k views

Why is RAID 0 classed as RAID when it's not redundant?

I've worked in IT quite a number of years, so I know what a RAID array is, what RAID 0 is, RAID 1, 5, 6, 10, 50, 60, etc., but something sprung to mind in a recent conversation at work; if ...
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2answers
124 views

Debian software RAID1 is not working when I remove hard drive

I have been trying all weekend to get RAID working on an old server computer with the Intel ICH7 / ICH7-R SATA-II controller running dual hard-drive with RAID 1. After giving up in hardware raid, I ...
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1answer
116 views

Replaced SATA controller, software RAID (mdadm) stopped booting: grub rescue> no such disk

I have a relatively old server machine which has no SATA ports on the motherboard (Dell Precision Workstaion 650). Also have a cheap FakeRAID controller (VIA VT6421 Chipset) and two Seagate 3TB drives ...
2
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1answer
41 views

mdadm RAID 6 rebuild when remaining drive(s) have bad sectors

I'm setting up a system at work to store some critical data. I will be using 4 x 1TB drives to create RAID6 via mdadm. I did lots of reading and can't find a definite answer to my question: In a 4 ...
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1answer
58 views

mdadm: can I reconnect a USB disk as SATA without needing a rebuild?

In my server there's an mdadm RAID-1 array consisting of two SATA disks, named sdb and sdc. The sdb disk might fail soon (according to SMART data), and I want to replace it with a newly bought disk. ...
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50 views

Cloudlinux, GRUB 0.97, software RAID, won't automatically boot

My server is running Cloudlinux as has a software RAID mirror (/dev/md2 made from /dev/sda and /dev/sdb) mounted on / It's been running fine, but after simulating a raid failure and rebuilding the ...
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2answers
24 views

Can I convert a single-disk system to software RAID1 without double-copying?

I have read this question: Can I create a "soft" RAID1 array without nuking data? as well as many other tutorials that layout this general process: Create degraded RAID1 array on new drive ...
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0answers
22 views

mdadm raid1 back to single drive

I have a raid1 install of debian 7 with software mdadm on 2 disks. What I want here is to split this to 2 separate systems and be able to multiboot them. I guess while I have the system running ...
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29 views

What are these raid errors?

I installed a new server with two sets of mirrored RAID 1 drives. The system sees 2 1TB drives, each of which is a mirrored set. This is a software raid (no hardware controller) done at BIOS level. I ...
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2answers
51 views

LVM Reduce a RAID6 array

I made the mistake of setting up RAID6 using LVM directly. For better flexibility, I need to switch to managing RAID through MDRAID. Is there a way I can reduce the size of the array (freeing up ...
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1answer
414 views

How is LSI FastPath different from Software RAID?

This question pertains to SSDs on RAID levels without parity (like RAID 0, 1, 10). The recommended settings for FastPath are to set the Write Policy to Write Through, Read Policy to No Read Ahead and ...
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84 views

RAID 5 keeps failing after recovery

I have configured a raid 5 with 6x2TB devices with mdadm (I shrinked it from 9 devices to 6): /dev/md0: Version : 1.2 Creation Time : Mon Sep 23 17:54:25 2013 Raid Level : raid5 Array ...
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67 views

Error reading boot configuration data on primary hard drive Windows Web Server 2008 R2

I have a root server on Hetzner which is running Windows Web Server 2008 R2. I am facing an issue with boot up. The server hangs up for some reason and when I issue an automated restart from Hetzner's ...
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154 views

Tuning mdadm RAID 5 performance?

I have a system with dual Intel E5-2620 v3 @ 2.40GHz, 64 GB ram, an LSI 3008 HBA, 8x 1.6 TB Intel S3510 SSDs. I've been playing benchmarking it in different configurations using fio and I've gotten ...
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127 views

How to recover an Intel RAID 0 on a Rocks cluster distribution

We had a Rocks 5.5 distribution on our cluster and wanted to upgrade to 6.2. The "/export" partition was mounted on a Intel software RAID 0 array of 2 identical hard drives (HD) (/dev/sdb and ...
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1answer
382 views

Linux Software RAID10: Mysterious renaming /dev/md0 to /dev/md127: Why?

During the last two nights we had mysterious events on a server running Ubuntu Linux 12.04 LTS with a Linux mdadm software RAID10: DeviceDisappeared /dev/md0 NewArray /dev/md127 Both messages ...
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1answer
38 views

RAID 5 failure Ubutnu 12.04 not rebooting

I have Ubuntu 12.04 setup with software RAID 5. Dmesg started to show I/O errors continuously. I thought to reboot the system and lo and behold, it got stuck on GRUB ERROR Loading 21 I then used ...
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1answer
226 views

mdadm set the mode before a second device raid1?

i have a problem. server use two disk softraid1. disk sda is die, and replaced disk. and reboot now, copy partition table sdb to sda ok. next step copy boot record sdb to sda ok. finaliy add sda in ...
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76 views

CentOS 6.6 - reshape of RAID 6 stopped

I have a CentOS 6.6 Server with 13 disks in a RAID 6. Some weeks ago, i upgraded it to 17 disks, two of them configured as spare. The reshape worked like normal in the beginning. But at 69% it ...
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462 views

DRBD server not starting - error in creating netlink socket

I have a newly configured DRBD-Cluster 8.4.5 on 2 VM running ubuntu 14.04, following this example: http://geekpeek.net/configure-drbd-ubuntu/ Unfortunatelly I can not start the service. It seems to ...
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698 views

Remove Failed Drive in Windows Storage Pools

I am currently using Windows Server 2012 R2 with Windows Storage Pools I have a virtual disk called "2T RAID" that is in Parity mode. There are 8 - 2T hard drives in this virtual disk. Today one of ...