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Questions tagged [raid1]

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

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RAID 5 to 2x RAID 1

Is it possible to convert RAID 5 to 2x RAID 1 without any data loss? Example: 3x 1TB HD in RAID 5 + 1x 1TB like Hot Spare convert to 2x 1TB RAID 1 + 2x 1TB RAID 1
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MegaCLI RAID1 - Can't Replace Missing Disk

I have a RAID1 where I've replaced a disk with errors, however it will not automatically or allow me to manually replace the "missing" disk with the new one. Here are the physical disks per my ...
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Got only half the space of RAID10 LV with 4 PVs (similar to RAID1 cause LV shows it has 4 'Mirrored volumes')

I'm trying to build an raid10 lv for root fs. I used these commands: lvcreate --type raid10 -m 1 -i 2 -l 24576 pve # created lvol1 lvcreate --type raid10 -m 1 -i 2 -l 8 pve # created lvol2 lvcreate --...
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Can I run Checkdisk on only one drive of RAID 1 array? [duplicate]

I have a server with several websites on it – some are Wordpress, others plain HTML. It runs Windows Server 2008 R2. Some time ago it caught a nasty virus. While it was infected, the websites still ...
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72 views

“Symbol 'grub_efi_secure_boot' not found” after disk replacement on boot (CentOS 7.5, RAID1)

Recently I had to replace a faulty HD at a Centos 7.5 server with RAID1 (2 x Samsung NVMe disks) After disk replacement, server booted using the other drive, I copied the same partitions at the new ...
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53 views

Persistent multiple medium errors on LSI RAID array

One of our SuperMicro servers with an onboard LSI 2308 RAID controller has been having issues with our main RAID10 array consisting of 4 Seagate 600 PRO SSD drives (in slots 0,1,2,3). It started with ...
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120 views

How to recover data - from Software RAID1 - MBR is lost on both drives

I'm trying to recover raid1 array, both disks are NVMe flash drives. I did really stupid thing in the end of long and bad day - erased first 512 bytes of each NVMe drive - the intention was to ...
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95 views

Recover RAID 1 after unclean unmount

I have two drives in my desktop in RAID 1. My computer locked up on me yesterday, so I used SysRq REISUB for a "safe" restart. When the machine booted back up, I realized there was no data on my RAID ...
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how to recreate a raid 1 array from a (failed) drive

A friend (yes, not me) had a RAID1 array where he didn't notice that both drives went massively bad (I suspect the computer was dropped or otherwise abused). I'm trying to recover what I can from the ...
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HP Proliant ML350 G5, raid 1 both disks failed, running on spare, rebuild?

I have a HP Proliant ML350 G5, Smart Array E200i controller, with the following configuration: SATA Array A: RAID 1 with 2 x 160GB disks + 1 x attached spare disk of the same size. SATA Array B: RAID ...
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32 views

One drive failed in my RAID 1 array, am I safe to replace it without losing data?

We have a server with three disks. Two of them are in RAID 1 defined in BIOS. One of these is showing an error at the bootup screen with the corresponding disk serial code in red. I intend to replace ...
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191 views

Replacing a drive in a mirrored set (RAID1), how does it know which is “primary”?

Let's say I have a RAID 1 array with two mirrored drives. One goes bad. If I order a spare online and just put it in, the hardware controller will rebuild the array, right? How does it know which ...
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39 views

need to migrate from single drive to raid 1 system

I own a server that only had 1 hard drive installed. I saved up and now purchased 5 large hard drives all are sas drives. My server is supermicro amd and has a built in raid controller. Here's the ...
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Any way to make an hex dump of a SAS drive behind a RAID1 (PERC H200) controller?

I have SAS drives in RAID1. The RAID1 is done by a PERC H200 card on a Dell PowerEdge T310. This card has four sockets: 0,1,2,3. The RAID1 uses slots 0 and 1. When inserting third disk in slot 2, ...
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How to create software raid on working ubuntu server with gpt?

i have this structure of hdd on my server: fdisk -l Disk /dev/sda: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / ...
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Do more mirrors in raid 1 reduce the likelihood of spit-brain failures?

I'm setting up a server, and my predecessor had a habit of setting up multiple RAID 1s with only 2 disks, which eventually resulted in split-brain situations which were difficult to recover from. ...
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Cloning multiple SATA drives using dd with the assistance of software RAID1

So, I clone lots of Windows-based NTFS drives from images each day and I'm halfway through a project that could potentially help me and others to speed up this process dramatically. I currently have ...
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Constant heavy led activity but no reported issues

On an IBM x3550 with two disks in hardware raid 1, have I heavy led activity on both drives, as soon as the raid controller is initialised at boot. It have been like this for more than a month, and ...
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1answer
380 views

TRIM issues with software RAID1 (mdadm) on two different SSDs (size and manufacturer)

I plan to do a server with 2 SSDs in RAID1 (for OS and boot) and 3 HDDs in RAID5 (for data). All Linux (CentOS7) with mdadm. We have in the office 2 leftover SSDs, but they are from different ...
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553 views

Does RAID 1 have a stripe size?

I'm trying to understand RAID levels. I wonder if the notion of a stripe size would make sense for a RAID 1. The drives are more or less byte for byte mirrors of each other. Therefore, the RAID ...
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55 views

Windows Server 2012 Raid 1

I have a question that might seem like a very basic or noob question but here it goes. Quick back story: Our company has an HP server that holds the databases etc for our POS PC / Cash Registers. The ...
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137 views

grub2 RAID1 disk failure - unable to boot

Background I am setting up a server with software RAID1. This includes the /boot partition being mirrored (mapped to md0). My aim is that if one of the two hard drives containing the OS (sdc and sdd) ...
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1answer
461 views

Trouble Installing Ubuntu Server on PowerEdge R330 (Hardware RAID1)

I'm having trouble installing Ubuntu Server 16.04 LTS on a hardware RAID-1 setup on a new Dell PowerEdge R330 Server. I'm using a bootable USB made by Rufus-2.18. (I'm a newb to server setups, so ...
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111 views

2 x RAID1 vs. RAID10 with four disks

I have a QNAP TS-412 NAS and used two disks so far. I decided to upgrade to four disks and now have options with respect to RAID. I am looking for maximum security against failure of disks (preferably ...
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RAID 1 Rebuild - Old OS and new OS

My task is to do a Windows Server 2008 R2 Standard re-installation on a DELL Server. All data will be migrated to the new Installation. The server has only two HDD's in RAID 1. To have a backup ...
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505 views

How to recover from a RAID 1 Disk Failure on HP Proliant Gen8 v2

I just had a disk failure on one of my physical drives of a RAID 1 logical drives, on a HP Proliant Gen8 v2 Server running Windows 2012 R2. The problem is that the original drive is 500GB and I only ...
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3answers
85 views

What if I don't replace failing disk in Raid1

I have a home server on Synology DS716+ running Raid1. Currently Disk1 S.M.A.R.T. status is Failing and also Bad Sector Count displays 2. So obviously I should replace this hard drive, but I am ...
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2answers
60 views

Raid 1 from already initialized disk

I have 4TB disk (A) with data in it. Now I've bought a new 4TB disk (B), and I want to start a RAID1 so that B becomes the mirror of A, without loosing data on A. I'm under linux with mdadm tool. The ...
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1answer
85 views

3-drive RAID-1 on pfSense box

I have a pfSense box with a 2-drive RAID-1 using gmirror. Recently, a drive failed, and I replaced the drive, and the RAID-1 is now back to normal. But this incident also made me interested in ...
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How to set up system-drive RAID1 on Server 2016 with two HDD larger than 2TB?

Foreword: As much as I tried to search the internet, most of the tutorials are for regular smaller than 2TB drives. And there are tons of forum posts that say "use hwraid". And I found a method that ...
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2answers
68 views

How portable are drives configured in hardware RAID 1?

I have two HP DL380 Gen9 Servers with H240ar RAID controllers. One is for production and the other is for dev/staging. I'd like to build up two physical drives in RAID 1 on the dev server then put ...
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3answers
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How do I know if I run hw raid 1?

I created a hw raid 1 using efi. Server Dell PowerEdge T20 with Proxmox The raid controller is 00:1f.2 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 04) root@pve:~# lsblk ...
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287 views

Raid 1 backup or backup of backup [closed]

I recently upgraded(because of fear of failure) my back up drive from a 750GB Toshiba Canvio USB3 drive(couple of years old) to a WD My Book Duo 6TB USB3 drive. I configured WD My Book Duo as Raid 1 ...
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112 views

GParted shows Raid1 partition as Ext4, how can I correct that?

As I've recently bought some extra disks to store my VM disks redundantly, hoping for some increased read performance and redundancy in case drives fail, I started building a RAID array. I've ...
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109 views

IBM ServeRAID 8k-l controller issues during “Rebuild” operation

I have a server with IBM ServeRAID 8k-l RAID controller. It has two HDDs in RAID 1 array. After the server reload, IBM ServeRAID 8k-l RAID controller started the rebuild operation for physical drive #...
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Mirror Disk failed when one disk failed

On Windows Server 2008, I create a mirror disk (RAID 1) (note: the screen shot was taken after system recovered from this problem): Today, I face a situation that, after a power outage, Windows ...
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1answer
120 views

linux mdraid: sfdisk partition table copy fails

One of the disks in my MD RAID 1 failed, and I had it replaced. Now the system runs on /dev/sdb, /dev/sda is blank. Although the disks are not identical (SAMSUNG HD753LJ vs. SAMSUNG HD754JJ), I made ...
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432 views

Migrate 2-disks LVM to RAID1

I've got a machine with two physical identical hard drives which are currently set up with LVM as one logical volume. The original idea was to make use of as much "contiguous" space as possible in ...
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1answer
776 views

How to Resize RAID partitions on Ubuntu Server 16.04

Recently we configured an Ubuntu 16.04 on Server. We have two 256 GBs SSDs. After a while we recognised that our main RAID partition has only 20GBs while other partition has more than 200GBs. Here's ...
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2answers
292 views

Add raid 1 from an existing drive without losing data

I recently added a new hard disk on my server and wanted to add it on my existing hard drive forming a RAID 1. I wanted to use Disk Management as it will be the easiest way to mirror the existing one. ...
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20 views

Is it safe to test and erase a drive after removing it from a RAID1 array with mdadm?

I have a faulty drive in my RAID1 array (SMART errors, data corruption). I have marked it as failed and removed it from the array with mdadm: # mdadm --manage /dev/md0 --fail /dev/sdb1 # mdadm --...
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215 views

Megacli, Recreate Virtual drive from existing Drive and new Drive

I have a hosted Drive (Ovh), configured with Raid 1 (LSI) The system request me to change a faulty drive, so i asked ovh to change the drive. Once Done, the server was rebooted on rescue Mode (WinPe), ...
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1answer
520 views

Getting files out of XFS with 64kb block size

I've been on a mission to recover files from one of my 2 perfectly working, non-corrupted, non-encrypted NAS drives that used to be in RAID 1. The NAS was Patriot Javelin S4, which (as I found from my ...
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1answer
392 views

smart long test - what is the performance impact on busy server?

I have a busy server with a RAID 1 setup. The application (runs in PHP) is very read/write intensive to the database (MariaDB). A cronjob runs smartctl short test every day and checks the output of ...
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534 views

How RAID 1 and RAID 10 become different when there are 8 logical disk?

RAID level 01 is the hybrid version of RAID 1 and 0 and this is illustrated below. Source: Wikipedia.org In COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE (NINTH EDITION), by ...
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Cloning SAS RAID1 array with OS partition to a new SATA array?

I have two RAID1 arrays, first one is made of SAS disks and that's where the OS (Win Server 2k8 r2) is, the second RAID1 array contains SATA SSDs (and hold the database). Server is IBM's System x3650 ...
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1answer
79 views

How should I increase the size of a raided server?

We have a server that was set up with an ubuntu software raid setup in raid 1 with 2 6TB hard drives so that we have 6TB of storage available and backed up so we are safe if one of the hard drives ...
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55 views

LVM: unable to add pv to vg in CentOS 7.3

I have a server with 6 disks, each pair are in raid1, and are presented to Centos as /dev/{sda,sdb,sdc} When installing CentOS, I set the root LVM VG on sdb as I planned to add sdc and sda as extra ...
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converting from raid 10 to raid 1 on windows server 2012 r2

My current setup is that my OS and other important installed files are all installed in my raid 10 array, however, I need the 2 drives (ssd) in the array for something else, is there a way to convert ...
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250 views

Data scrubbing and repairing a RAID1 mirror?

In Linux, if I have a software RAID1 mirror /dev/md1 with N ≥ 1 active devices, what are the semantics of the repair command? echo "repair" >/sys/block/md1/md/sync_action Am I correct to ...