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

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Dell PowerEdge T520, PERC H310 RAID 1, can I hot swap a HDD without shutting down the server?

I have a Dell Poweredge T520 running Win Server 2008 Rc2 with a PERC H310 RAID Controller. Two 15000 rpm 600GB hard drives setup in RAID 1. One drive is rapid flashing orange indicating failure. Can I ...
5
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2answers
143 views

mdadm software RAID isn't assembled at boot during initramfs stage

First, I prefer to mention I've found and read this. I'm running Debian Jessie with a standard 3.16 kernel. I've manually defined a RAID1 array. But it is not assembled automatically at boot time. ...
1
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1answer
33 views

Replace failed RAID 1 Drive on Intel Platform

Good afternoon, I have a Intel Server running Windows 2008 R2 Standard. It has a RMS25PB080 Raid controller card in with. It has two logical drives, a RAID 1 and a RAID 5. The one harddrive on the ...
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22 views

Mount One drive part of a Raid 1 in another Linux system

my system does not have Raid setup and this is my first time that I need to mount a drive that was previously on a Raid system. I have both drives, and I do need to check the consistency of the ...
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0answers
13 views

Does mdstat showing very different block sizes for identical drives indicate a failing drive?

One of my servers has a RAID1 array composed of two 240GB SSDs. It is managed/controlled via Linux, not via a hardware card. Recently, for no apparent reason, the array needed rebuilding. I rebooted ...
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0answers
18 views

Recovering grub2 after raid1 disk change: stage1 not read correctly

After recovering from a raid1 disk change I cannot install grub2 any more. I think that I recovered from the disk change correctly (the raid array assembles, I can mount and access the data, etc.) but ...
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3answers
74 views

Can you recover files from an overwritten RAID 1? [on hold]

Edit: The array is actually RAID1, slight communication hiccup with the rest of my team. Following the decommissioning of one of our server, a manager just realised there was, after all, data that ...
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0answers
16 views

HP Proliant G6 - Smart Array p410i, RAID 1 Disk upgrade

We currently have 2 500Gb spinning disks in a RAID 1 configuration. Since we are hitting our storage capacity limit, we want to safely replace both disks with 2 larger SSD's. We have a Proliant G6, ...
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100 views

HP DL360 G6 ssd on raid 1 with smart array p410i write verry slow, how to fix it?

I just bought a HP DL360G6 server with a P410i RAID card with 256mb cache. I am using Windows server 2012 I use Intel 520 series 240GB SSDs in raid 1+0, but the speed is very slow. I checked the ...
2
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1answer
33 views

Should I expect both disks in my RAID1 array to fail at about the same time?

I have an Ubuntu server with two HDD drives in a software RAID1 array. These are identical drives, and I'm assuming they're seeing the same level of read/write activity over their lifetimes (correct ...
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1answer
56 views

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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67 views

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 ...
0
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2answers
146 views

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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2answers
71 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 ...
3
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2answers
168 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 ...
0
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1answer
26 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 ...
0
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1answer
182 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 ...
3
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2answers
82 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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0answers
16 views

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 ...
1
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1answer
112 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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1answer
27 views

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 ...
0
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1answer
572 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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0answers
16 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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0answers
96 views

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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0answers
180 views

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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2answers
33 views

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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1answer
48 views

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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0answers
79 views

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. ...
0
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1answer
194 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 ...
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3answers
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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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0answers
217 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 ...
0
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2answers
75 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 ...
1
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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 ...
0
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1answer
73 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 ...
0
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1answer
81 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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2answers
99 views

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 ...
0
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1answer
35 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
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1answer
170 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 ...
0
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2answers
632 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 ...
0
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1answer
86 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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2answers
1k 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 ...
0
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1answer
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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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25 views

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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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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517 views

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 ...
0
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1answer
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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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1answer
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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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1answer
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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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1answer
279 views

Disk errors Event ID 51 on LSI MegaRAID 9240-8i in RAID 1

I am working on a case of recurrent disk errors. Server is running Windows Server 2012 R2 Standard. There are two main disks on a mirrored RAID. There is also an additional drive that is used for ...