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

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How can I check if my server have RAID-1?

With lsblk command I get: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 232.9G 0 disk ├─sda1 8:1 0 32G 0 part │ └─md0 9:0 0 32G 0 raid1 [SWAP] ├─sda2 8:2 ...
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4k views

SBS 2003 boot stalls at acpitabl.dat

I have a SBS 2003 server running for 3 year without any problems, and few days ago it freezes during the boot. System is using two 500 Gb drives in RAID1 (Intel Matrix 7.5) After trying to load in ...
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Add a new disk to raid1 on LSI Logic SAS1064E B1 controller

I've a trouble with my (two disks) RAID1 array running on a LSI Logic SAS1064E B1 controller. The array is degraded and one disk isn't detected by the controller. I've tested both disks with a sata to ...
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1k 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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44 views

HP Smart Array P212 - rebuild Array 1 for OS without loosing Array 2 (Data)

Ok.. I'm fairly new to this, but I have a DL180 G6 running with following configuration an HP's P212 Controller: 01 Array: 2x 1TB for OS 02 Array: 12x 2TB for Data Now I would like to Change both ...
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83 views

LVM Raid 1 + SSD Caching

I have three disks: /dev/sda slow hdd /dev/sdb slow hdd /dev/sdc fast ssd /dev/vg0 volume group consisting /dev/sd{a,b,c} Each logical volume (lv) should be raid1 mirrored and ssd cached. With ...
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PERC H310 - Multiple RAID 1 Arrays

Currently, I have a RAID 1 (using two 1TB disks) configured on PERC H310 controller on a PowerEdge T420 Server. It currently contains Windows Server 2012, a Hyper-v role, applications and SQL Server ...
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418 views

Rebuilding RAID1 issues

My upgrade to Karmic went well, I even got a message from the utility Palimpsest saying that one of my drives in my RAID1 had many bad sectors. I purchased a same sized drive from Newegg and replaced ...
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133 views

Transfer from RAID-1 to RAID-0 — easy as cloning?

I have a RAID-1 of 1TB drives using on-board RAID. I have 2 new 240GB SSDs I want to place in RAID-0. This is Windows Server 2012. I know with disk cloning/transferring that it is important going ...
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24 views

mdadm RAID1 won't rebuild

A drive on one of my Hetzner servers failed yesterday. I've replaced it once before, but this time it just will not work. After I copy the GPT to the new disk, I add one of the partitions to the ...
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79 views

Uneven disc throughput in RAID1 configuration

I am having performance issue caused by slow IO in server which has two identical SSDs in RAID1 configuration. By using "atop" noticed that discs usage is no even: DD | md2 | busy 0% ...
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68 views

Linux- Convert 2 disk raid1 to raid0

I have a linux server (3.19.0) which has raid setup with md (v3.2.5). / is a raid1 device with 2 disks. There was a mistake when installing this machine, instead we need those 2 disks to be in raid0 ...
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Raid 1 and Raid 5 with Debian 8 Install [duplicate]

Ive been advised that i should install Debian 8 using the following raid configuration: Raid 1 (2 discs) - for OS Raid 5 (4 discs) for data. This way, i can have 2 disc failures and still have a ...
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1answer
591 views

mdadm: Convert RAID10 to RAID1

The machine in question is equipped with 4x ssd, and running Debian wheezy 7.8, linux kernel 3.2.0-4, mdadm v3.2.5. Currently I'm using a RAID10 consisting of all these ssd. I've to increase the ...
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2answers
865 views

Adding New Drives to Dell R720 in RAID 1 Configuration w/ Dell Lifecycle Controller

I have a Dell R720 with two 136GB drives set up on an existing virtual disc running RAID 1. I've run out of room, purchased two additional 600GB SAS 15K drives I'd like to set up for RAID 1 also to be ...
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1answer
90 views

Recover Data from RAID 1 : Array failed

I have a HP Proliant ML150 server with a scsi raid controller installed. Two disks are configured in RAID 1. My problem is when i start my computer, in the beginning, a message appears that the array ...
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350 views

Synology disk mirror SHR or RAID 1

I created a mirrored volume on my Synology DS415+ created with two equal disks. The default mode was Synology Hybrid RAID (SHR) but I see that I could also could have chosen for 'regular' RAID 1. As ...
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Are there any two-bay hardware bit/block level replication devices (perhaps RAID-1)? [closed]

Here's what I'm hoping to do: Have two drives in a hardware bay that can be pulled from the front without dissassembly Read and write to it as a single (NTFS) disk Be able to pull either drive and ...
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15 views

Reducing the Size of a Partition in RAID1 CentOS

I need to reduce the size of a partition in RAID1. The current configuration of the disks are shown below: (parted) select /dev/sda Using /dev/sda (parted) p Model: ATA ST1000NM0011 (scsi) Disk ...
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1answer
2k views

How can I coax RHEL / CentOS / SL 7 into booting normally with degraded software RAID 1

I set up a new server (my first with this version of Linux). I installed a pair of 160 GB blank SATA HDDs (one Seagate and one WDC, but with exactly the same number of LBA sectors) in an old machine, ...
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Bad sector on disk, part of a LVM over RAID1 array, which files are affected?

My RAID1 array /dev/md1 is rebuilding after one of the disks has been replaced. Problem : the source disk has Unrecoverable Errors, and my only choice if I do not want to lose the whole data set (no ...
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How to auto-start Degraded Software RAID1 under Debian 8.0.0 on boot?

If you remove a component HDD from an array, it drops into a "busy box" shell under "(initramfs)" saying something similar to "cannot mount root device" as the RAID1 array becomes "inactive". It is ...
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How to solve intermittent server hangs? Write to (and read from) a disk stops completely

We have a LAMP server for about 6 months. CentOS 7.0 It ran non stop without a restart for the first 3 months then it hang. Then it run for the next 2 months (also non stop without a restart) then ...
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Recover files from a failed RAID 1 - How do I rsync if source file size is bigger

I have 2 drives that were on a mirrored RAID. The server crashed (failed array) and there are no backups. The client was setup with Carbonite, but failed to renew their plan, which expired this past ...
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Handling the potential risk of writing random bits to storage during power loss with RAID [closed]

Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device? Someone proposed the following idea to address such a risk: create multiple ...
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IBM MegaRAID Storage Manager, Build RAID1 from existing disk

Recently my RAID Controller went FUBARBUNDY and decided to drop my RAID1. The server would not boot since then. According IBM support expert, rebuilding that RAID array would wipe data on both disks. ...
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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 ...
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138 views

Hardware RAID1 configuration - Possibly failed sectors on one physical disk. Does the OS automatically read from the other disk?

I'm not a professional sysadmin but since I couldn't find answers to my specific case after researching for a while I was hoping I could get some help here. Our server uses P222 - a HP Smart ...
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142 views

HP Array Utility, Remove a spare drive from a Raid 1 Array

I have a DL380 with 2 Raid 1 arrays with spares. As the server is a part of a cluster I want to remove the spares and create a new logical drive with them. The problem is that HP Array Configuration ...
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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 ...
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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 ...
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1answer
64 views

How to add more RAID 1 storage on Server after the fact?

I have set up a Lenovo TS440 Server (LSI 9240-8i, MegaRaid)) with Windows Server 2012 R2 Essentials and (2) RAID 1 mirror arrays. After noticing that the DATA array (2TB) is actually quite small ...
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814 views

RAID controller won't rebuild RAID-1 array

I have a RAID-1 array on a desktop computer. The RAID controller is a 3ware 7006-2. Recently the controller has been reporting ECC errors from one of the drives. It was able to correct all of those ...
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911 views

System does not boot from root LVM RAID1 partition when any of the underlying PV is missing

I have LVM RAID 1 (not mdadm RAID 1, but exactly LVM2 RAID 1) for my root partition. I would like to make my system boot without either of the HDDs where the underlying PVs of the root LVM partition ...
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79 views

Best RAID level for NAS [closed]

I just bought my first computer that I'm going to run as a NAS with OpenMediaVault as OS. I bought two HDD (WD red 5400 rpm) with the capacity of 3TB each (and one 120GB SSD that I'm going to run the ...
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RAID 6 - any write amplification in 4-drive RAID?

We're planning to move from a 4-drive RAID6 to a SSD RAID 1, and I was analyzing smartctl data to see how many GB we've writen to the drives over the past year so I can estimate the lifetime of the ...
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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 ...
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452 views

How does Rebuild in host-raid RAID-1 works?

I am testing a Non-Hardware Raid with 3 1TB Disks. I create a RAID-1 Array with my first 2 Disks and installed Windows 7 on the Raid disk that i'd created. I unplugged the first disk SATA cable in ...
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123 views

Adding additional hot swap drive to HP ProLiant DL360 in RAID1 config

I have a HP ProLiant DL360p Gen8 server. It has 8 drive bays with only 6 being used in a RAID1 config. Can I add an additional 2 drives to the empty bays hot and the HP Smart Array Controller will ...
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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 ...
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1answer
20 views

Splitting RAID drives from ReadyNas Duo

I have an old ReadyNas Duo that is on its last legs and starting to play up. It currently has 2x 1TB drives inside, configured in a mirrored RAID 1. I've just purchased an external caddy, and ...
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CentOS Raid 1 drive fails on raid-check

I have a pair of HP DL320e servers configured identically with two WD Red 6TB drives in a software raid 1 array. The DL320e has an on board raid controller which is disabled in favour of linux ...
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Proactively hot-swap a suspect drive

For one drive in a hardware RAID 1 mirror set (Areca ARC-1200 under Linux), smartmontools is beginning to report read errors with the short selftest every other week. The long selftest still completes ...
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Ubuntu RAID1: How to boot after (physically) removing /dev/sda? (mdadm, Grub2)

Several months ago I installed Ubuntu 14.04.2 Server (x64) with RAID 1 using the following instructions: https://help.ubuntu.com/lts/serverguide/advanced-installation.html I followed the ...
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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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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 ...
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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 ...
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133 views

Is it better to store the MySQL database directory on a separate RAID 1 device?

We have a Linux server with a RAID 1 using two HDDs on which runs a Apache server managing multiple sites and some other services that interact intensively with the databases and produce massive ...
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mdadm Software RAID1 with GPT on Debian 8.0 amd64 - Does not boot on disk removal [closed]

INTRO: I have spent countless days attaching/detaching MOLEX->SATA power cables, rebooting machines and trying hundreds of edits and commands. I am on the verge of desperation and desperately in need ...
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4answers
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mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?

Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...