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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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Raid 1 upgrading drive size

I have a hardware raid array in an HP Proliant ml350 server. I have 2 logical drives. Drive "C" has three 67.5 SCSI drives in a raid 1 configuration and Drive "D" has two 67.5 drives in a Raid 0 configuration. Can I start swapping the raid 1 drives…
Mike Gostovich
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RAID 1 - IOPS Write Penalty 1 or 2

I keep seeing articles describing the RAID IOPS write penalty for RAID 1 (and RAID 10) as 2. RAID 0 would have a penalty of 1, of course, since every write is simply written to disk. RAID 1 is described as "requiring two writes", thus a penalty of…
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How to move RAID 1 to RAID 1+0

I have two HP disks in RAID 1 (300 Gb), and would like to at 2 additional disks in RAID 1+0 having in total of 600 Gb on C:. I would like to know is it possible to do it using Array Configuration Utility without loosing and data? Controller is…
John
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ZFS: 3 devices: what's the difference between mirror and raidz2?

It would seem like with 3 devices, it's possible to configure a ZFS pool with either mirror or raidz2 mode. What's the difference in performance and reliability? (In regards to reliability, I'm specifically interested in the topic of partial data…
cnst
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Remake SW RAID1 from a new HDD and an old HDD with bad blocks

I have a SW RAID1 and I just replaced /dev/sda with a new HDD as the old one failed. Now, upon trying to recreate the RAID array I discovered that the "good" HDD (/dev/sdb) has bad blocks with prevent mdadm from resyncing the array. While I…
Alex Flo
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Converting BTRFS filesystem to RAID1 fails with "Inappropriate ioctl for device"

I had a ~1.6TB BTRFS volume on a single partition, to which successfully I added another freshly created and formatted partition (on another device) of exact same size with the intent of mirroring them. The size of the volume now appears to be…
jaymmer - Reinstate Monica
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RAID1: One RAID per Partition or Partitions on RAID device?

What is better suited for a normal Server: several partitions, which are bundled as several RAID1 devices (/dev/md0, /dev/md1, ...) without any partitions, which are not mirrored. one big /dev/md0, and partitions on this device What are the…
allo
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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 enabling --write-behind the system should read…
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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 need a way to check it from os. How can I do that…
rumburak
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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 drive. Has some partitions on it that boot the system…
zimmy6996
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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 software RAID 1 arrays, one containing all the…
Steven T. Snyder
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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 performing as usual with only one disk until the…
Paul
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CentOS - hardware raid 1 of two drives not being treated as single drive by fdisk

I am a bit new to hardware configuration in general, much less with linux, so please give me a little slack :) I have the following setup: 1 320GB Drive that contains the OS (centOS) and 2 250GB drives that have a hardware RAID1 configuration…
user30130
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Clarifications on encrypted LVM in Ubuntu, RAID1, and headless server

I’ve pondered about encrypting my hard disk on my laptop and server for quite some time, but never got around to it since I don’t think I understand how encryption affects my day to day usage and the complication in setup and management. I hope to…
Vinh Nguyen
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RAID disk format / transferability between controllers

A couple of RAID questions. I think I know the answers, but just wanted to double-check since I am about to play will several years worth of personal data. Do I understand correctly that: If I have a RAID-1 (mirror) setup, then I cannot use…
Pedro San Lukas
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