RAID solution handled by the operating system.

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1answer
26 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 ...
7
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4answers
755 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 ...
2
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1answer
58 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 ...
1
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0answers
35 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 ...
1
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1answer
12 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 ...
0
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1answer
13 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 ...
4
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1answer
37 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 ...
2
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0answers
28 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 ...
31
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6answers
3k 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 ...
2
votes
2answers
68 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 ...
2
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1answer
68 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
31 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 ...
0
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1answer
39 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. ...
1
vote
0answers
32 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 ...
0
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2answers
22 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 ...
2
votes
0answers
18 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 ...
0
votes
0answers
23 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 ...
2
votes
2answers
38 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 ...
0
votes
1answer
168 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 ...
0
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0answers
79 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
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0answers
47 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 ...
1
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0answers
113 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
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0answers
97 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 ...
1
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1answer
112 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 ...
1
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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 ...
0
votes
1answer
98 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 ...
2
votes
0answers
67 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 ...
1
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0answers
319 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
1answer
360 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 ...
0
votes
2answers
64 views

mdadm - RAIDs of partitions or partitions of RAID?

If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to: 1) Configure the RAID out of partitions that encompass the whole drive (like ...
2
votes
1answer
130 views

RAID1 - mdadm mirror - not performing parallel reads as expected?

We have a three-way RAID 1 mirror which is powered by mdadm. I think I read that mdadm is supposed to take multiple simultaneous read requests and distribute them across different drives in the ...
1
vote
1answer
41 views

RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
1
vote
2answers
84 views

How to tell mdadm to use a partition as/instead of a block-device?

I have four 500GB disks which were set up as a Linux Software-RAID 5 volume during the Debian install (next to the system drive which is a SSD). One of the drives (sda) went bad and now I am trying to ...
1
vote
1answer
58 views

How/When to physically remove a failing harddrive after replacing it in a Linux RAID?

I have a Linux software RAID-1 with mdadm. Similar to this question ("How to safely replace a not-yet-failed disk in a Linux RAID5 array?"), I want to replace a disk in a the raid. My question might ...
0
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0answers
160 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 ...
1
vote
1answer
46 views

postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks

I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
0
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1answer
34 views

Is a partition necessary when using RAID?

I have configured raid1 on two of my disks. I am not using a partition, because I want to use the entire disk. Is this correct? The command lsblk produces the following output for my disks: sdc ...
0
votes
1answer
85 views

RAID1: approx performance difference of 3 active vs. 2 + spare?

My question concerns only Linux software RAID ("md"). I'm going to set up a RAID1 array with three devices. I need to choose between using the third disk as a spare or as an active member of the ...
1
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2answers
121 views

Diagnose RAID utilisation on a failed drive

I am facing a problem on a server I didn't install, the former guy isn't here anymore to explain me anything. Some processes crashed due to what seems to be a disk failure, so I searched in the logs ...
2
votes
1answer
93 views

Mounting degraded RAID

I've finally managed to assemble my RAID10 array again. I'm hoping there might now be a way through this. (There is history, if anyone is interested). I'm now getting: # cat /proc/mdstat ...
0
votes
2answers
579 views

mdadm, RAID5 all disks marked as spare, won't start

RAID5 config with mdadm and 4 disks After some incidents, eg one of the drives was lost, had to reboot the server and rebuild the array, my raid is in a funny situation cat /proc/mdstat ...
0
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0answers
336 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
17 views

Disk goes read-only after disabling RAID 1

I am not so expert in Linux. We have a computer (working as server) with Ubuntu 10.10. It has 2 RAID 1+0 hard disks. Today one of the hard disks failed, so we removed it, and disabled it by mdadm ...
0
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0answers
80 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, ...
4
votes
1answer
103 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
votes
1answer
51 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 ...
1
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2answers
106 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?
1
vote
1answer
73 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
77 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 ...
1
vote
1answer
67 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 ...