RAID solution handled by the operating system.

learn more… | top users | synonyms

4
votes
0answers
7k views

How to recover an mdadm array on Synology NAS with drive in “E” state?

Synology has a customized version the md driver and mdadm toolsets that adds a 'DriveError' flag to the rdev->flags structure in the kernel. Net effect - if you are unfortunate enough to get a array ...
2
votes
0answers
24 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] ...
2
votes
0answers
41 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 ...
2
votes
0answers
24 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 ...
2
votes
0answers
77 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 stopped....
2
votes
0answers
25 views

Disk Management showing all disks failed and extra spots after replacing a disk

Hello I work for a small company and one of our departments backs up all of their data onto a HP NAS with 4 x 3TB HDDS in a software RAID5 configuration running windows 7 64bit. We recently had one of ...
2
votes
0answers
442 views

Windows software RAID 1 with EFI bootloader on both disks

I have a Windows Server 2008r2 with two HDDs installed. The main partition, which has Windows installation on it, is mirrored between the two disks. The problem is, this is a UEFI machine, and EFI ...
2
votes
0answers
587 views

Restore LVM if VG is not consistent (XenServer 5.6.1)

i have a VG that uses the PVs /dev/md1 and /dev/md2. Now one hdd failed in /dev/md1: [root@xenserver1 ~]# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda3[0] 382320128 blocks [2/...
2
votes
0answers
365 views

MD Raid can't be assembled

I was running a Raid5 with 3 disks at on my homeserver. But had some problems with the back-plane for the disks. The disks weren't detected reliable. So I replaced the back plane and the disks are now ...
2
votes
0answers
451 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
1
vote
0answers
24 views

Recovering a RAID5

Hoping somebody here can help, as I'm a bit stuck on what to try next. Essentially, I had a RAID5 of 4 disks in mdadm. One of the disks started failing, not enough to have mdadm eject it, but enough ...
1
vote
0answers
32 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 ...
1
vote
0answers
29 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, ...
1
vote
0answers
16 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 ...
1
vote
0answers
52 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 ...
1
vote
0answers
165 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 ...
1
vote
0answers
129 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 /dev/sdc)...
1
vote
0answers
480 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 ...
1
vote
0answers
211 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] ...
1
vote
0answers
472 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 ...
1
vote
0answers
1k views

Ubuntu 14.04 mdadm issues on boot

I have a 14.04 Ubuntu machine which has: 2 x SSD in RAID 1 (md0) 3 x Sata HDD in RAID 5 (md1) The machine is set to boot from the md0 device. This machine has been running fine for a month or so, ...
1
vote
0answers
140 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
1
vote
0answers
207 views

RAID6 Ubuntu rebuild - how to calculate best parameters for fastest rebuild

I am doing a resync on a RAID6 array and I am looking at some 2 days to complete. I looked here for hints on how to speed it up, but I have, instead, managed to slow it down! HW details are: 10x 4TB ...
1
vote
0answers
1k views

calculating optimal chunk size for Linux software-RAID

Am I correct that optimal chunk size is average file read/written to disk divided by number of block devices in RAID array storing the data? For example if the average file size is 1024KiB and I have ...
1
vote
0answers
241 views

Why was the replacement drive for failed drive in RAID 1 (linux software raid) was added as a spare?

I have a two drive linux software raid 1 for a server. There are two raid devices. (Boot (md0) & OS (md1)) Last week one of the drives failed so i ordered a new one. Today i shutdown the server, ...
1
vote
0answers
79 views

What is the issue with the boot setup on this raid array?

After a secure erase of /dev/sda (Samsung 840 Pro) I had to setup grub on /dev/sda2 (for some unknown reason the /boot partition is the second one). So I ran something like this: grub<br> root(...
1
vote
0answers
215 views

Safe filesystem encryption using mdadm and cryptsetup in EC2

I need to safely store some encrypted information in EC2. For this purpose, I'd like to encrypt a filesystem on my EBS drives to ensure that third-parties won't be able to poke around in my data. ...
1
vote
0answers
100 views

Fresh debian squeeze software raid install wont boot

I am following these instructions: http://www.iprobot.net/linux-tutorial/how-to-setup-software-raid-in-debian-ubuntu/ (I used debian-live-6.0.6-amd64-gnome-desktop.iso and DD'd that onto a usb key, ...
1
vote
0answers
282 views

mdadm drive UUIDs chanaged, can they be changed back?

So I ran into this trouble and I believe I lost all my data..However I found an old mdadm --examine --scan file I made a month ago and an old mdadm.conf....Is it possible to use these two items to fix ...
1
vote
0answers
87 views

Single drive LVM to RAID6 LVM

I cloned my entire LVM volume group from a single drive to a RAID5 array with 3 disks. The VG is formed by these logical volumes: root swap home ... and other volumes of some XEN virtual machines. ...
1
vote
0answers
457 views

Reusing slot numbers in Linux software RAID arrays

When a hard disk drive in one of my Linux machines failed, I took the opportunity to migrate from RAID5 to a 6-disk software RAID6 array. At the time of the migration I did not have all 6 drives - ...
1
vote
0answers
2k views

Best way to change disks with Intel Rapid Storage Technology 10.8.0.1068; only one disk in current array

I have a raid 1 array which is currently missing one disk. I want to change the system over to two completely new disks. I currently have Intel Rapid Storage Technology 10.8.0.1068 installed. What is ...
1
vote
0answers
325 views

After upgrade to SLES11 SP1 - LVM on top of software RAID5 not working anymore

On a system where I have been running OpenSuSE11.1 for some time I performed a fresh installation of SLES11 SP1. The system used a software RAID5 system on top of which an LVM was setup with a single ...
1
vote
0answers
409 views

Windows Server 2008 - RAID 5 Fails on Reboot

I've got an install of Windows Server 2008 Enterprise. It's running software RAID-5 with five disks. The disks were originally formatted under Windows Server 2003, but came up fine once I installed ...
0
votes
0answers
15 views

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.
0
votes
0answers
18 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 ...
0
votes
0answers
30 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 ...
0
votes
0answers
24 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) sdf1[7]...
0
votes
0answers
29 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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
71 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 ...
0
votes
0answers
200 views

Windows Server 2012 Software RAID 1 with dynamic disks; mirror two drives to one larger

Lets say I have 3 SSDs: 1.) 120 GB, 1 Partition 2.) 128 GB, 1 Partition 3.) 250 GB, Mirror Is it possible to mirror both the partition from SSD 1 and SSD 2 to the large third SSD? Such that the ...
0
votes
0answers
433 views

Mount a NTFS Raid0 disk under linux debian

In my new laptop I have a a RAID 0 configuration with a normal disk and a smaller SSD drive. I have removed the dvd bay and replaced the dvd player with a 256 GB SSD drive where I run linux debian. I ...
0
votes
0answers
105 views

MD RAID Array Often Starts Without All Drives

I find that, when I start/restart my system, my MD array often doesn't start with all of the drives even though the device-names haven't changed at all. I'll have to stop the array and reassemble it, ...
0
votes
0answers
57 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
votes
0answers
878 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 ...
0
votes
0answers
43 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 ...
0
votes
0answers
299 views

Can Windows Storage Spaces Mirror use 5 HDD in JBOD?

I have a 5 disk USB 3.0 enclosure (JBOD configuration, Windows see's 5 physical disks) with a max of 4TB per disk. I want to make a Windows Storage Spaces in mirrored mode (all data written to 2 ...
0
votes
0answers
604 views

mdadm: All RAID disks look good, but can't access devices

Now, granted, issues with RAID rarely come up (at least with the one that I have to deal with in my life), so I'm not the most experienced person in the world. However, I'm not seeing any issues with ...