RAID1 or mirrored RAID uses two disk that have the same data.

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Is it reasonable to make a RAID-1 array with a ram disk and a physical disk to maximize read performance and protect data?

In one of the answers on SO (I forgot which one) I've seen a suggestion to make a RAID-1 array composed of a RAM disk and a physical partition. By adding the physical partition with --write-mostly and ...
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2answers
294 views

RAID 1 after install and two controllers

I have question regarding RAID 1. Can I setup software RAID 1 after having installed the first drive and setup ubuntu 12? I know that during server install and partitioning I can select RAID and setup ...
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288 views

Restoring data from a failed and possibly partly overwritten mdadm raid1

I have a failing hard disk (let's call it sda) which contains, among other things, a 1.5 TB partition (let's call it sda3). There is another disk (sdb), which has a 1.5 TB partition (sdb1) as well. ...
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102 views

Replace RAID1 Disc - things to consider

One of my RAID controllers is complaining about a harddrive failure: -- Controller informations -- -- ID | Model c0 | PERC 5/i Adapter -- Arrays informations -- -- ID | Type | Size | Status | ...
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2answers
305 views

How do I find out which disk in a multi-disk mdadm RAID1 triggered a rebuild?

I'm using mdadm for several RAID1 mirrors. md7 is an N-way mirror consisting of 3 spinning disks (all flagged write-mostly) and an SSD: md7 : active raid1 sdd1[0] sde5[3](W) sdf5[4](W) sdc1[1](W) ...
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Configure raid for IBM x3200 M2

I have a x3200 server and I have planing to use raid 1 for mirroring Sata Hardisk . I am searching on google to find raid server manager for x3200 , but no luck . Is there another way to configure ...
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237 views

Ubuntu Server - RAID1: Operating System not found

I'm trying a RAID1 on Ubuntu Server 12.04 in virtual machine and I followed the post: RAID1: How do I "Fail" a drive that's marked as "removed"? I added two disks and created ...
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2answers
435 views

From which plex am I booted from on raid?

I have a server with mirrored boot volume. It is software raid 1 in Windows Server 2008 R2. I do not have physical access to the server. I am looking for a way to check which disk is a boot drive. I ...
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678 views

Linux Software RAID1 Rebuild Completes, but after reboot, its degraded again

I have been beating my head with an issue here, and I'm now turning to the internet for help. I have a system running Mandrake Linux, with the following configuration: /dev/hda - This is a IDE ...
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2answers
1k views

NAS device claims drive in a RAID is degraded but S.M.A.R.T. says it is fine

I have a Synology DS213 with two 600GB drives in RAID 1. Last night the device reported that my second drive had become degraded and that I should replace it. When I ran a extensive S.M.A.R.T. test ...
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475 views

How to Detect Hard Disk Failure

I have a software RAID 1 setup in my CentOS 6.2 and set to be bootable in any of the HDDs in case one of them fails. Questions: How can I recognize if one of the HDDs fail? or early signs of ...
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154 views

Hardware RAID in CentOS 6.2

I have a ServeRAID-BR10il SAS/SATA PCIe Controller RAID O and 1 Standard. Do you have any suggestions how to install it in CentOS 6.2? All the tutorials I found are only software RAID. Hope you guys ...
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84 views

Installing MySQL in CentOS 6.2 with RAID 1

Is the installation of MySQL in CentOS with RAID1 the same as that of none? If not, what are the changes in the process of installation?
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541 views

Why did my zpool replace never finish and what should I do now?

I have a ZFS zpool with two disks in a mirror configuration, da0 and da1. da1 failed, and so I replaced it with da2 using zpool replace BearCow da1 da2 This ran for a few hours, during which zpool ...
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2answers
330 views

RAID1: Which disk will be mirrored?

How does a RAID1 system determine which disk to use as the source and which disk to use as the destination when mirroring? Assume for instance the following scenario: A RAID1 array is created with ...
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1answer
3k views

Dell Open Manage message in Windows Event Log, should I be worried?

I have a Dell T110 server with a SAS 6i/R controller and two hard disks in RAID 1. Ocasionally a warning appears in the Windows Event Log with the following message: SAS port report: SAS wide port ...
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1answer
180 views

Best practice for replacing failing drive in a TWO Domain Controller domain

Hi I have a two domain controller domain and i will refer to them as DC1 and DC2, here is some info on them. DC1 is or has all FMSO roles DC2 serves as another Domain Controller for replication DC1 ...
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1answer
117 views

Dead Linux server - need help and options

I have a Dell PE 1950 with 2 SATA drives in a software RAID1. OS is CentOS 5.5 (2.6.18.x). Starting this afternoon we received HW errors (something on the bus is bad, E171F) and the machine became ...
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1answer
378 views

install boot with raid 1 in 3 TB disks

I'm trying to install /boot in a RAID 1 using 3 TB disks. As the RAID partition do not let you manage partitions than more than 2 TB, CentOS automatically configures the partitions using GPT. My ...
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1answer
156 views

Storage setup on Ubuntu Server used for running virtual machines with software redundancy

I have a server I would like to use explicitly for running virtual machines under Ubuntu Server 12.04. It has plenty of RAM, 64GB and three large identical HDD´s. I would like redundancy through ...
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89 views

Linux Software RAID 1 issue

I recently had a HDD failure on a SW RAID1 system (Debian 6.0) and what happened was that the active HDD looked like it had some badblocks which somehow propagated to the HDD that was still OK but it ...
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1answer
126 views

grub2 failing to detect md0 for /

I recently set up a raid 1 array. Both / and /boot are on md0 (sda, sdb). everything was working when it was in degraded mode before I synced the two disks together. It was booting from grub2 on ...
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467 views

Ubuntu server boot degraded raid

I've installed Ubuntu 12.04.1 in a new server and set up the 4 hard drives with 3 RAID 1 devices, the configuration is such that the first two drives have md0 (swap space) and md1 (/) with the third ...
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Ubuntu 12.04 Server Software RAID1 - Faulty Spare - Smart Output Passed - Confused

I think I'm having an issue with one of the hard drives on my array and I'm just trying to troubleshoot what's happening. Its saying Faulty Spare and then after reboot it just says removed: ...
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1answer
801 views

mdadm and blkid give different uuid

We recently replaced a hard disk in a server and reinstalled the operating system (Centos 6) The raid rebuilds itself every boot; /dev/md2 is losing a disk each time apparently. Always the same ...
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926 views

Where is my new hard disk Citrix Xen Center

I'm trying to create a new storage repository on a server that already has 2 old hard disks, set up with hardware RAID 1. It's my first time doing this in Xen Server environment so I wanna be extra ...
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1answer
325 views

Is there a way to prevent a SW RAID 1 from degrading?

I have a number of Debian servers in a datacenter and from time to time I notice that the software RAID 1 was degraded. While the re-sync process starts automatically and I don't lose any data I find ...
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7answers
741 views

Which RAID/LVM configuration for new 2x8TB file server is safest?

I just built a totally new PC to be a fileserver. It has one 60gb SSD for OS (ubuntu 12.04), and 8 2tb data drives in it. I am looking for the safest, most stable way to set up a single giant ...
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1answer
107 views

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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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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/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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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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3answers
253 views

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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1answer
875 views

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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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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346 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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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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3answers
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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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74 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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311 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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1answer
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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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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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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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785 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
125 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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431 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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2answers
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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 ...