RAID solution handled by the operating system.

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4
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3answers
246 views

Linux MD RAID resilience in situations with unpredictable power

If you were given a situation where you MUST use RAID for reasons outside of your control and the server with the RAID may not be on a battery backup and the building is prone to power loss, what are ...
1
vote
1answer
184 views

retrieve software RAID information using WMI [duplicate]

I need to get software RAID configuration info from a remote windows server (2003, 2008, 2012) on a local linux system. I have searched and searched, but have been unsuccessful at finding a solution, ...
-2
votes
1answer
91 views

What are the pros/cons of software raid made up disk connected over SATA and others over USB? [closed]

I would like to use RAID1 with 1 SATA disk and 2 USB disks PS: This is an ARM board (cubietruck) with only 1 SATA port and 2 USB ports. PS2: The OS boots from a SD card :) PS3: The setup does not ...
2
votes
1answer
46 views

Mirroring System Drive On Server 2008

I have server 2008 installed on a hard drive that disc management calls a "basic volume." On this hard drive I have partitions configured for certain sets of data. I want to buy a second hard drive ...
3
votes
1answer
234 views

RAID-5 array being split on reboot (ubuntu)

I've set up a RAID-5 array on Ubuntu 13.04 (kernel 3.8.0-27-generic) using mdadm - v3.2.5 - 18th May 2012. It appears to work fine and be in high spirits: $ cat /proc/mdstat Personalities : ...
2
votes
0answers
540 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 ...
0
votes
1answer
646 views

Can I use a RAID card with chipset SIL3124 with no driver?

I have a software RAID card with a SIL3124 chipset. (This one). As you configure the RAID via BIOS, is it possible to use this card with 3 disks (RAID 5) with any OS without installing any driver on ...
1
vote
0answers
61 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> ...
0
votes
0answers
3k views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
0
votes
1answer
42 views

mdadm grow operation giving nonstop libata errors

Running Debian 7, mdadm 3.2.5. I issued a command to grow a 5 disk, 3 spare raid 5 array to an 8 disk, 0 spare raid 6 array: mdadm --grow /dev/md0 --level=6 --raid-devices=8 ...
4
votes
2answers
66 views

hba for software raid

In a software raid environment, is HBA failure the same as a hardware RAID controller failure? Do you still have to find the same model HBA to put into a different server in order for the drives to ...
-1
votes
1answer
1k views

RAID1 on existing CentOS6 Install

I have two 500GB hard drives in my server. Currently, there is no RAID configured, but CentOS6 is installed (as a bare install for now). Is it possible to set up a software RAID-1 so that both drives ...
1
vote
2answers
574 views

Path of md device wrong after reboot

I have to set up a software raid (level1) on a Ubuntu server 12.04. It should serve files in the network via Samba. The server has the following disks: 250gb Sata hdd (Ubuntu is installed on that ...
0
votes
2answers
237 views

Linux: How to restore data from failed disk from software raid

I have a disk failure in software RAID (1) and marked a broken disk as fault (mdadm --manage /dev/md0 --fail /dev/sda1). Unfortunately I destroyed data on the second disk after that. Is it possible to ...
3
votes
1answer
219 views

ZRAID1 pool size bigger than expected

I have 3x 4TB drives for a ZRAID1 config (single parity drive) After running zpool create data zraid1 sdb sdc sdd I have a volume that's 10.9T in size, which is what I would expect from a stripe ...
0
votes
0answers
98 views

Replace a slowly dying drive in Linux software raid5

I have the same problem as in Can I "atomically" swap a raid5 drive in Linux software raid? i.e. a Linux software raid with 3 RAID5 disks where one disk is showing smart errors but isn't ...
1
vote
1answer
487 views

Recoving from a software RAID 5 disk failure

I'm putting together a cheap NAS box and I've read some articles about raid5 not being as robust as I'd imagined. I wanted to get some answers to the following questions before I proceed. I'm ...
1
vote
1answer
665 views

Various problems with software raid1 array built with Samsung 840 Pro SSDs

I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: ...
-1
votes
2answers
85 views

What is the correct way to create new raid5 in Linux?

I added some new disks, and tried to create new array, using: mdadm --create /dev/md/2 --level=5 -x 0 --raid-devices=4/dev/sd{a,b,c,g}2 It creates the array, but after reboot - it's gone. What ...
3
votes
1answer
1k views

Server 2012 (R2) - mirroring the boot drive… what is the state?

I struggle to find modern documentation here. So far we have been booting our servers from the main RAID controllers. Worked nice, but not we get the first of a new generation that hs in the back 2 ...
0
votes
1answer
259 views

Raid0 assemble disk again?

Our server recently suffered a disk failure, so our hosting provider put a new Disk in with CentOS so we can login and see if we can recover the data. We had 2 x 120 GB SSD drives in software RAID0 ...
1
vote
1answer
283 views

Sharing an EC2/EBS RAID10 Array using NFS

I created a 10 disks RAID10 using EBS on AWS EC2 using mdadm on a ubuntu 12.04.2 LTS instance. Let's call this instance A. It works fine and I can create files and folders perfectly in the volume. I ...
1
vote
3answers
1k views

Slow software raid with SSDs

We have moved a web application with an Oracle database to a new server because the old one was dying. The old server had two mirrored hard discs plus a separate non-mirrored SSD for the Oracle ...
0
votes
2answers
430 views

Convert Raid 1 to Raid 10 with no new disks

I just got a new remote root-access server with 2 1TB disks in a Raid 1 configuration, running Debian (squeeze). Before installing my stuff on it, I'd like to switch to Raid 10 if I can. All the ...
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votes
1answer
536 views

How to increase disk write-speed for SSD RAID10 array?

I've had no luck searching how to setup writeback cache on a RAID10 setup using mdadm software RAID. I'm trying to set this up for a 4x256Gb Samsung 830 SSD setup which only has 400Mb/s write speed... ...
0
votes
1answer
122 views

Does the built-in CentOS software RAID distribute writes?

Will I see a write performance increase going from single disk to CentOS Software RAID10? Any industry estimates on the % increase?
5
votes
1answer
3k views

How to get email alert if one of raid 1 disks fails?

I need to know how can I get email alert if one of raid 1 disks fail to work/crashes. I have CentOS 6.4 64bits, software raid. I did some mistake folowing this tutorial, because it was a bottom note ...
0
votes
1answer
174 views

Installing Raid 1 on Ubuntu 13.04

I am trying to install raid 1 on my new ubuntu server using software raid. My drives are 2 x 3TB I have set the format of the drives to gpt. Created 3 partitions (1mb - grub) (2gb swap) and the ...
0
votes
2answers
5k views

Dell T110 II Server 2008 R2 Installation

I have a Dell T110 II with 2 1TB drives in raid 1 using the S100 on board raid. When I load Server 2008 R2 it says, "No device drivers were found. Make sure that the installation media contains the ...
0
votes
1answer
72 views

How to mount Soft RAID in centOS

My dedicated server crashes. I've rebooted it in rescue mode and want to mount to see the log and/or fix the boot file. I've CentOS and soft RAID. How do I mount soft RAID? Following are the details: ...
2
votes
2answers
798 views

Remake SW RAID1 from a new HDD and an old HDD with bad blocks

I have a SW RAID1 and I just replaced /dev/sda with a new HDD as the old one failed. Now, upon trying to recreate the RAID array I discovered that the "good" HDD (/dev/sdb) has bad blocks with prevent ...
0
votes
1answer
325 views

Saving data on a failing software RAID 1 setup

My CentOS 6 server is running a software RAID 1 configuration with two 1 TB disks. Yesterday trouble started happening when the server was very irresponsive. I checked the logs and noticed a whole ...
0
votes
1answer
301 views

Software RAID for a petabyte storage array [closed]

I'm trying to build my first personal storage area network (flexible downtime, speed is not a priority) to hit 1 petabyte on a budget, and am considering a modification of the Backblaze pod as the ...
2
votes
2answers
87 views

erased md0, md1 and can't recreate them

I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1. I need to set them up again. When ...
2
votes
1answer
2k views

How to boot after RAID failure (software RAID)?

Previously I had a software raid set up using (mdadm) of drives sda and sdb. sdb failed and the only way to reboot the system was by unplugging the second hard drive. Now I've added fresh sdb and sdc ...
-1
votes
1answer
243 views

Restructuring RAID Array (Windows Storage Spaces)

Our current production server has 6 hd's in a RAID 10 array. Technically it's not RAID, but the new Windows Storage Spaces feature in Windows Server 2012 (think software-RAID). These six are used for ...
0
votes
1answer
689 views

Creating raid1 array with mdadm cuts space

I'm trying to create RAID1 mirrored disks on already deployed system (CentOS 6.4). I have two disks: source /dev/sda with the OS and /dev/sdb which will be the mirror. The disks are connected from ...
0
votes
2answers
392 views

HDD in RAID failure?

I received some alerts from mdadm. Further checking seem to indicate that some HDD's may be damaged. Could you please verify that? There is two SCSI drives which should work in RAID1 This is an ...
3
votes
2answers
5k views

Using software-RAID vs “firmware”-RAID (a.k.a. FakeRAID) [closed]

We recently bought a tower server on which I want to install Debian. I thought the device had hardware RAID, as I could see a BIOS screen. As it turns out, it's still a software RAID. When I configure ...
2
votes
1answer
3k views

Linux RAID5 Optimal Chunk Size

I bring up, yet again, the ever-present question of how to best optimize disk structures. In my organization, we have a 14TB Linux software RAID array dedicated to storing backups made using Symantec ...
0
votes
3answers
245 views

RAID 5 with two failed devices

I have a software RAID 5 with 6 devices and one of them needs to be rebuilt. Until now, everything is OK. But, while the disk is rebuilt, it was found bad sectors on another disk and is being marked ...
2
votes
1answer
665 views

How to grow mdadm RAID5 into degraded state?

mdadm - v3.2.5 - 18th May 2012 Currently have: Version : 1.2 Creation Time : Tue Jun 25 19:03:31 2013 Raid Level : raid5 Array Size : 2930135040 (2794.39 GiB 3000.46 GB) Used ...
7
votes
2answers
306 views

Linux software raid fails to include one device for one RAID1 array

One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64. Every time I ...
1
vote
0answers
212 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. ...
4
votes
2answers
3k views

Major issues with fsck of 10TB ext3 RAID 6 (memory allocation failed, etc.)

I recently added a 7th 2TB drive to a linux md software RAID 6 setup. After md finished reshaping the array from 6 to 7 drives (from 8 to 10TB), I was still able to mount the file system without ...
4
votes
2answers
1k views

What happens to missed writes after a zpool clear?

I am trying to understand ZFS' behaviour under a specific condition, but the documentation is not very explicit about this so I'm left guessing. Suppose we have a zpool with redundancy. Take the ...
3
votes
1answer
345 views

Performance of Linux software raid-1 across SSD and HDD (partitions)

How does Linux software raid-1 work across disks of dissimilar performance. Would a raid-1 across ssd and hdd partitions give me a mirror of the ssd contents while not impacting the read speed? I ...
5
votes
1answer
946 views

100% packets dropped on first RX queue on 3/5 raid6 iSCSI NAS devices using intel igb (resolved)

Edit : The issue is resolved. The Queues in question have been used for Flow Control Packets. Why the igb driver propagated FC packets up to have them dropped (and counted) is another question. But ...
1
vote
1answer
156 views

RAID1: Can I do 'write-mostly' in hardware (LSI type cards) so Drive A: 100% READ and WRITE and Drive B: ONLY WRITE?

The Google hammer has failed me, so I turn to this august body for help :-) I'm interested in doing SSD/HDD RAID1 pairs using the principle of 'write-mostly' as available in Linux's software RAID ...
2
votes
1answer
1k views

Attempt recovery of MDADM RAID, on images created with dd

I have a software RAID5 array with 4 + 1 disks in which 2 of the disks have failed. I'm hoping that with some percussive maintenance, I might get one of the failed disks working again long enough to ...