RAID 1 or Mirrored RAID uses two or more disks that store the same data.

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RAID1 disks on new windows 7 installation

I have a PC with Windows 7 on one disk A. Two other disks B and C are software (Windows 7 disk management) RAID1 mirrored. I want to reinstall Windows 7 on the first disk A. Will the new Windows 7 ...
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RAID 10 vs RAID 1 SSDs [closed]

I'm considering moving a large database from mechanical disks to SSDs. My initial instinct was to go for RAID 10, but further research suggests that this configuration can significantly reduce the ...
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948 views

IBM ServeRAID 8k level 1 critical

This is my setup: Lenovo ThinkServer RD140 IBM ServeRAID 8k controller Four Seagate Barracuda 1TB hard discs, organised in two RAID-1 arrays Now the third disk is defunct (orange light flashing). ...
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444 views

/boot on separate disk or on the raid array

I have 3 ssd disks (59 GB) each. I want to use them as sofware raid5 with fedora 15. I read that it is recommended to have /boot on a separate disk. 2 questions: 1) is it possible and advisable to ...
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691 views

Rebuild doesn't finish after raid1 disk replacement

In one of our servers one of the disk failed, no worries it happens all the time, we replaced the bad disk following the usual procedure but then ... 'the horror', after adding a new disk one of the ...
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File corruption when copying different file on raid 1

I have a RAID 1 configuration of 2 1TB drives on a Fedora 12 box. Most of what is stored there are video files that are numerical labeled. The problem I'm having is that I had one of the video files ...
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Can I move an entire software RAID1 array containing Linux to another machine?

I want to move an entire array of drives from old server hardware to new server hardware. There are 3 SATA drives with two partitions each; a small boot partition and a data partition. There are two ...
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216 views

Linux software Raid LVM restore volume group

first of all: excuse my bad english :) We use a Archlinux server with 3 HDD in software raid 1 mode. There should be two lvm extended partition from which i think they should be work in volume ...
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443 views

How to replace my Unix( SUSE Linux 10.1) raid drive

Im new to this server stuff and , i have a server with SUSE Linux 10.1 on it with Raid 1 hard drives , i want to replace one of the raid drives but don't really know if i remove the drive and attach ...
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204 views

sda1 (?) raid failed on debian - what to do now?

ispconfig says that my server has raid problems. The server is not mine, it is rented from a hosting company. The OS installation was not my business: the hosting firm did it. cat /proc/mdstat ...
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mount: unknown filesystem type 'linux_raid_member'

I have Suse Linux 12.1 and i am trying to mount a single RAID 1 disk, to explore the files in it. However when mounting it: # mount /dev/sdc1 /mnt/test mount: unknown filesystem type ...
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What would happen if I did a raid on a SSD and an HDD?

I am building another server (cheap) and would like to go with a 256GB SSD drive for my boot and data. This will be enough for my needs, but just having one SSD scares me for a couple of reasons. If ...
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79 views

Does the order of SAS drive matter when installing old drives?

I have an old IBM server with 12 hard drive bays, 4 of which are used (SAS 72GB drives), and configured in a RAID 1 array. The server will be sent away for repairs, when it comes back, do I need to ...
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1answer
404 views

Sync SSD to spindle drive using RAID or DRBD

I'm setting up a server with and SSD as the primary drive, and would like to duplicate the data onto a cheaper drive as a block-level backup (à la RAID1). Since I don't want to hobble the performance ...
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What's the difference between “mirror” and “raid1” in LVM?

On the lvconvert(8) man page it says: --type SegmentType Used to convert a logical volume to another segment type or to explicitly state the desired RAID1 segment type ("mirror" ...
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575 views

RAID 1 Failover

Given two disks in a (hardware) RAID 1 configuration, what exactly happens to a production system when one drive fails? Is there any noticeable service interruption, or will the system continue ...
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736 views

large RAID 10 vs small RAID1

The machine will store and serve millions of small files (<15Kb each), and all those files require a total storage space of 400G Considering the exact same SATA hard drives maker and models, on the ...
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998 views

Backup data from RAID 1 disk out of its server

I'm facing with a pretty easy problem in my opinion. I've extracted a working disk from a RAID1 and I'm looking to copy only data (FS and RAID configuration doesn't matter) into another location ...
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1answer
179 views

Moving hdd with ESXi to another computer

I have ESXi with multiple virtual machines on it. My disks are configured as RAID1. I'd like to move these disks to another computer, and I'd like to know if ESXi and the virtual machines would be ...
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mdadm raid1, [1/2] disks failed, safe to reboot?

I am seeing the following under /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0](F) sdb2[1] 976554876 blocks super 1.1 [2/1] [_U] bitmap: 4/8 pages [16KB], 65536KB chunk md0 : active ...
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1answer
588 views

3ware Raid Migration 9650SE

I'm trying to migrate a single disk on a 9650SE 4LPML to a RAID 1. I'm trying to use 3dm2 to accomplish this, but the only options it will allow me to migrate to is either RAID 0 or RAID 10. I only ...
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242 views

RAID for load balancer needed?

We have two load balancers, one used as hot-standby. Would you recommend me using a RAID1 setup in case of a harddisk failure? Or is RAID1 not needed as in case of a failure the hot-standby server ...
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178 views

Create a RAID1 Mirror After OS and apps have been installed

We are building a server but one of the new disks is dead on arrival. If we put the os and apps etc on the first disk, when we get the bad disk replaced can any one see any reason we shouldn't be able ...
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mdadm: hot remove failed for…

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
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266 views

Delete RAID 1 from Debian

i've Debian installed RAID 1 2x 160GB HD, i want to delete it but i'm totally noob in linux, i don't want to install fresh image and start from scratch again, i cannot do backup because i've nearly ...
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Adding disk to RAID 1

I have a HP DL120 server running under co-location with a 2 disk RAID 1. Now i want to gain DB read speed by adding two more disks. My question is if the two disks automaticly will be included in the ...
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229 views

RAID1 with non-empty HDDs on a NAS

On one hand I have 2 HDDs with data, which are clones of one another I made using Cavalry Retriever duplicator. On another hand I have a brand new Patriot Javelin S4 NAS unit. I'm new to both RAID and ...
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721 views

RAID 10 or RAID 1 x 2 for Hyper-V with AD, EXCHANGE on Windows 2008 R2

We have 2 servers which have 6 SATA 7200 disks inside (each). We want to configure both servers so that they will have Window Server 2008 R2 Enterprise installed and on top of it Exchange 2010 x2 (for ...
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432 views

Installing VMware vsphere 5 on multi raid array server

We recently bought a new server that came with 2 600GB disks in a Raid 1 and 5 2TB disks in a raid 5. Initially this was going run Windows Server 2008 R2, however, it was decided to now run VMware ...
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542 views

3ware 9650SE-2LP “sync” after a drive failure

I have a 3ware 9650SE-2LP card that was set up to mirror two 1 TB disks (let's call them Disk A and Disk B). A couple of months or so ago the array stopped working (gave me an error at boot-up saying ...
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174 views

lvm over two raid1's - one slow, one fast. What will happen?

Two software RAID1's, 0: 2x 15K SAS drives, 73GB 1: 2x WD Caviar Green, 3TB So the first RAID is a faster one, the second a slower data grave. What happens when I add both to a LVM logical volume ...
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Forgot to create a second RAID for swap partitions in Software RAID 1. Will it work?

I have a Ubuntu 11.10 headless machine setup with Software RAID 1. It has two drives, each drive has a main boot partition (sda1 & sdb1) and a small swap partition. I created a raid for the boot ...
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raid boot error

in boot.log /dev/md1: clean, 320806/58155008 files, 91390310/232603728 blocks /dev/md0 was not cleanly unmounted, check forced. /dev/md0: 32/24384 files (9.4% non-contiguous), 19957/97536 blocks ...
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Raid1 degraded after every reboot

After setup, cat /proc/mdstat output looks like this: proxmox:~# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc2[1] sdb2[0] ...
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RAID 1+0 redundancy and data-loss recovery capability against RAID 1

I have a HP ProLiant server with two SCSI drives. I wanted to set up a RAID 1 array but the RAID configurator only allowed me a RAID 0 or a RAID 1+0 array. When either of my drive fails can I recover ...
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808 views

How to rebuild RAID1 with missing drive on CERC?

I have a CERC/4i on a Dell 750 with two SATA drives. Due to a failing cooling system one of the disks stopped working. This has occurred twice before, so I am fairly confident the disk is not ...
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SSD redundancy via HDD

Is there a way to guarantee redundancy to an SSD using an HDD? Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to ...
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CentOS - hardware raid 1 of two drives not being treated as single drive by fdisk

I am a bit new to hardware configuration in general, much less with linux, so please give me a little slack :) I have the following setup: 1 320GB Drive that contains the OS (centOS) and 2 250GB ...
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936 views

RAID 1 disk is marked as Spare after replacement

one of two disks in my RAID 1 died so I replaced it. When new disk has been added to array the sync process started and few minutes later it has become a Spare. How can I "force" the disk to be a ...
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RAID 1 with motherboard software or SiI hardware?

I have to setup 2 servers with RAID 1 and the company cannot provide funds for the hardware needed until december, here is the hardware available: Computer A OS: CentOS 6.0 MB: EP41-UD3L RAM: 4GB ...
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910 views

How to remove swap partitions from RAID 1 Array on Ubuntu?

Can anyone point in the right direction on how to remove SWAP out of a RAID1 configuration on Ubuntu 10.04 server? According to the Ubuntu Advanced installation guide, here, it said to add swap to the ...
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How to resize RAID1 array with mdadm?

I've running Ubuntu 11.04 (kernel 2.6.38-11). I replaced 2x160GB with 2x500GB drives. They are configured as RAID1. The partition tables show the right sizes. Here's sfdisk: # sfdisk -d /dev/sdb # ...
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282 views

booting a system with failed devices in a RAID1 array

I have a Linux system set up with 3 software RAID1 devices, each of which comprises two identical partitions on two identical disks. Recently, one of the non-root partitions on one disk began ...
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Harddrive / Raid1 issues

I'm having problems with the hard-drives in my root-server. It's running with 2 hdds in a software Raid1. After having performance issues with a large MySQL DB, that writes via O_DIRECT and ...
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Motherboard fried on Windows RAID 1 System, do I have to reformat?

A faulty power supply fried my motherboard and I need some help. I had a spare motherboard lying around and hooked it up to one of the hard drives to see if I could just continue chugging along. ...
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1answer
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grub2 does not find /boot on RAID1 md0 device

I have RAID1 md0 for /boot consisting of 4 partitions (sda2, sdb2, sdc2, sdd2). I'm using GPT on 2TB HDDs, so first partitions on each disk (sda1, ...) are 1-megabyte bios_grub partitions. I also ...
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SCSI error: return code = 0x08000002, sense key: Aborted Command

The kernel logs: ata2.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action 0x0 ata2.00: irq_stat 0x40000008 ata2.00: cmd 61/08:f0:6f:5b:97/00:00:00:00:00/40 tag 30 ncq 4096 out res ...
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902 views

Hot swap failed software RAID drive with Windows Server 2008

Does Win2k8 natively handle hot-swapping of a hard drive? I have an existing server with 2 hard drives in it that are currently setup in a hardware RAID-1 configuration; they are each hot-swappable. ...
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255 views

Converting system disk to raid 1 on win server 2003

I have a domain controller running windows server 2003. Its running on a basic entry level server. I would like to improve redundancy by converting the disk to software raid 1. I'm looking for any ...
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Clarifications on encrypted LVM in Ubuntu, RAID1, and headless server

I’ve pondered about encrypting my hard disk on my laptop and server for quite some time, but never got around to it since I don’t think I understand how encryption affects my day to day usage and the ...