Questions tagged [raid1]

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

RAID Level 1 or mirrored RAID uses two or more disks that store the same data. One disk is mirrored to the other. Write speeds are the same as using one disk, and read speeds are twice as much.

RAID 1 is used when reliability needs to be higher than normal.

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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 8:32 0 1.8T 0 disk └─md4 9:4 0 …
Zweedeend
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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 configure them automatically into the RAID and…
medina
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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 available to the operating system. How do I go…
gh0st
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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 ideally I would like to pull one hard drive out, and…
terrorfall
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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 amounts of logs. Because the drives are not SSD but…
Victor Dodon
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Disk I/O at limit with software raid

whenever I use rm or cp on a bigger file structure the disk i/o is going up to the top, but not with the focus on cp or rm, it is the software raid sync. My knowledge in this area is limited. The topics I found were about finding the source of it…
user2693017
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Windows Server 2012 doesn't find RAID array during setup

I'm trying to install Windows Server 2012 to a HP ProLiant 140 DL G3. I've attached two Toshiba SSD drives with 256GB capacity each. I've enabled RAID in the BIOS and, using the built-in Disk Manager (pressing F8 during Boot), created a new RAID 1…
doque
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I mixed the arguments of sgdisk -R /dev/sdY /dev/sdX

I have two raid1 arrays and an LVM partition across both raid arrays. A disk died and I tried to copy back the partition table of the other member to it using sgdisk -R But I mixed the arguments, so after a reboot, the good disk seems as unusable…
Laurent
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The partitioning of a big disk is necessary for LVM's vg space expansion

I am maintaining a LVM's vg as users' /home directory's storage space. But now I need to add a new 2T sized disk for extending the /home space. I wonder if the partitioning is necessary or not and then I use the several partitions as physical…
Bill Zhao
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3TB RAID1 not detected in Hyper-V Core 2012

I'm creating a small server, but I have issues with one RAID config (RAID1-HOST-DATA). As you can see in the image below, everything seems fine. My four physical disk are detected, and two RAID1 are created as expected. I installed a Hyper-V Server…
esylvestre
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Order of execution: First file system, then array vs. first array, then file system

Suppose I have two HDDs, same manufacturer, same model, same attributes (volume, speed, cache, ...). Both are equally partitioned. I want to have a level one array of two disks with one ext4 partition. Tool of choice: mdadm. Which one is better? a)…
user2964971
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Windows 2012 r2 mirroring is not available

I have two disks that are a little bit larger than 2TB. During Windows installation i selected the whole unpartitioned disk to install Windows to. After the setup realized that installer created one 2TB partition and left some unpartitioned…
Glueon
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Converting Non-Raid to Raid

I have a server that currently has one 1TB drive in it. I just bought a 1TB drive to put in Raid-1 with it. The server already has data on it, so my question is what do I have to do to make it a raid array? Do I have to clone the hard drive before I…
Osmium USA
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Use old raid drive as boot device without data loss

There were two disks in sw-raid. There were /dev/md1 as swap, /dev/md2 as boot and a /dev/md3 with ext4. The sw-raid was disabled by stopping and removing mdadm and then zeroing the superblock on each /dev/mdX partition with: sudo mdadm…
Gabriel
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Debian server does not get to grub on boot (possible raid issue)

First a bit of backstory. I'm working at a small business that runs their own web/mail/file server. The server is running on Debian lenny and I have been trying to update it, I ran into a problem with dovecot not starting so decided to reboot the…