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

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495 views

3ware 9650SE-2LP “sync” after a drive failure

I have a 3ware 9650SE-2LP card that was set up to mirror two 1 TB disks (let's call them Disk A and Disk B). A couple of months or so ago the array stopped working (gave me an error at boot-up saying ...
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2answers
162 views

lvm over two raid1's - one slow, one fast. What will happen?

Two software RAID1's, 0: 2x 15K SAS drives, 73GB 1: 2x WD Caviar Green, 3TB So the first RAID is a faster one, the second a slower data grave. What happens when I add both to a LVM logical volume ...
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2answers
871 views

Forgot to create a second RAID for swap partitions in Software RAID 1. Will it work?

I have a Ubuntu 11.10 headless machine setup with Software RAID 1. It has two drives, each drive has a main boot partition (sda1 & sdb1) and a small swap partition. I created a raid for the boot ...
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1answer
258 views

raid boot error

in boot.log /dev/md1: clean, 320806/58155008 files, 91390310/232603728 blocks /dev/md0 was not cleanly unmounted, check forced. /dev/md0: 32/24384 files (9.4% non-contiguous), 19957/97536 blocks ...
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2answers
2k views

Raid1 degraded after every reboot

After setup, cat /proc/mdstat output looks like this: proxmox:~# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc2[1] sdb2[0] ...
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1answer
88 views

RAID 1+0 redundancy and data-loss recovery capability against RAID 1

I have a HP ProLiant server with two SCSI drives. I wanted to set up a RAID 1 array but the RAID configurator only allowed me a RAID 0 or a RAID 1+0 array. When either of my drive fails can I recover ...
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1answer
735 views

How to rebuild RAID1 with missing drive on CERC?

I have a CERC/4i on a Dell 750 with two SATA drives. Due to a failing cooling system one of the disks stopped working. This has occurred twice before, so I am fairly confident the disk is not ...
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2answers
516 views

SSD redundancy via HDD

Is there a way to guarantee redundancy to an SSD using an HDD? Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to ...
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2answers
2k views

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 ...
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2answers
700 views

RAID 1 disk is marked as Spare after replacement

one of two disks in my RAID 1 died so I replaced it. When new disk has been added to array the sync process started and few minutes later it has become a Spare. How can I "force" the disk to be a ...
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1answer
144 views

RAID 1 with motherboard software or SiI hardware?

I have to setup 2 servers with RAID 1 and the company cannot provide funds for the hardware needed until december, here is the hardware available: Computer A OS: CentOS 6.0 MB: EP41-UD3L RAM: 4GB ...
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2answers
813 views

How to remove swap partitions from RAID 1 Array on Ubuntu?

Can anyone point in the right direction on how to remove SWAP out of a RAID1 configuration on Ubuntu 10.04 server? According to the Ubuntu Advanced installation guide, here, it said to add swap to the ...
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3answers
9k views

How to resize RAID1 array with mdadm?

I've running Ubuntu 11.04 (kernel 2.6.38-11). I replaced 2x160GB with 2x500GB drives. They are configured as RAID1. The partition tables show the right sizes. Here's sfdisk: # sfdisk -d /dev/sdb # ...
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1answer
274 views

booting a system with failed devices in a RAID1 array

I have a Linux system set up with 3 software RAID1 devices, each of which comprises two identical partitions on two identical disks. Recently, one of the non-root partitions on one disk began ...
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1answer
216 views

Harddrive / Raid1 issues

I'm having problems with the hard-drives in my root-server. It's running with 2 hdds in a software Raid1. After having performance issues with a large MySQL DB, that writes via O_DIRECT and ...
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2answers
392 views

Motherboard fried on Windows RAID 1 System, do I have to reformat?

A faulty power supply fried my motherboard and I need some help. I had a spare motherboard lying around and hooked it up to one of the hard drives to see if I could just continue chugging along. ...
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1answer
5k views

grub2 does not find /boot on RAID1 md0 device

I have RAID1 md0 for /boot consisting of 4 partitions (sda2, sdb2, sdc2, sdd2). I'm using GPT on 2TB HDDs, so first partitions on each disk (sda1, ...) are 1-megabyte bios_grub partitions. I also ...
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1answer
2k views

SCSI error: return code = 0x08000002, sense key: Aborted Command

The kernel logs: ata2.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action 0x0 ata2.00: irq_stat 0x40000008 ata2.00: cmd 61/08:f0:6f:5b:97/00:00:00:00:00/40 tag 30 ncq 4096 out res ...
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1answer
751 views

Hot swap failed software RAID drive with Windows Server 2008

Does Win2k8 natively handle hot-swapping of a hard drive? I have an existing server with 2 hard drives in it that are currently setup in a hardware RAID-1 configuration; they are each hot-swappable. ...
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2answers
247 views

Converting system disk to raid 1 on win server 2003

I have a domain controller running windows server 2003. Its running on a basic entry level server. I would like to improve redundancy by converting the disk to software raid 1. I'm looking for any ...
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2answers
1k views

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 ...
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3answers
3k views

howto import existing linux soft array volume group

I have a server that consists of a boot drive, then two data drives combined to a RAID1 linux array. My boot drive recently became corrupted and I need to re-install the operating system. The RAID1 ...
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2answers
529 views

how to get block sizes larger than 4k in reads from an md raid1 volume

I wanted to setup a raid01 configuration (a raid1 composed of two raid0s) with one of the raid0 volumes having the write-mostly state set so all reads would go to the other (i.e. one is disk, the ...
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1answer
893 views

Windows 2008 R2 raid 0 over hardware raid 5

I am consider using windows raid 0 and raid 1 over two hardware 4x2tb raid 5 arrays. (thinking Seagate green drives). 2x Rocketraid 2680 controller but that could easily change. So, that would give ...
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1answer
2k views

Very slow write performance on Debian 6.0 (AMD64) with DMCRYPT/LVM/RAID1

I'm seeing very strange performance characteristics on one of my servers. This server is running a simple two-disk software-RAID1 setup with LVM spanning /dev/md0. One of the logical volumes ...
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3answers
1k views

RAID1 performance with madam

I am looking into performance issues we are having. We currently have a 4 drive RAID5 (3+1 fail over) and read performance sucks. Looking at RAID1 with 2 drives (maybe more, any benefit?) but from ...
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1answer
506 views

Linux (FC14/i386) is raid1 intact after hot fs install? How to repair?

My older (FC11) install had reached EOL, and I tried to reinstall FC14 on its RAID1 root filesystem. I'm now having suspicions that now, after the install FS is not fully raided. The question is if ...
0
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1answer
384 views

How to tell a disk failure in RAID1

I have an old Dell poweredge R200 in collocation which has 2 hard disks in RAID 1. I am wondering how should I know if one one the disks is failed?
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1answer
1k views

Raid1, one disk displaying SMART errors:

I have a HP Pavillion machine, and I'm using the RAID controller built into the motherboard (H-RS880-uATX, some consumer grade RAID controller, not sure who). I got a slew of event log errors from ...
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2answers
164 views

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 ...
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1answer
297 views

How to increase size of Raid 1 Allocation?

We had Raid 1 setup with two 1tb drives. I have swapped out the drives and now it was on two 2tb drives, however, the raid array is still only 1 tb in size. Is there a way to increase the size of ...
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1answer
785 views

Can you use drives while Raid 1 is rebuilding?

I am going to be rebuilding a raid 1 array. While the rebuild is happening can people still read/write to data in the array?
2
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1answer
466 views

How can I increase the size of a RAID array on the fly?

Right now we have RAID 1 running on 2 1TB hard drives. They are nearly full so I would like to replace them with a 2 TB drive. Is there a master/slave with RAID 1? Am I able to just pull one of the ...
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1answer
2k views

Setting up Raid 1 in a dell poweredge R300 server

Hello everybody i have a dell poweredge r300 server, and i want to set up Raid 1, how can i do that? thnx. PS: i cant access to the utility mode.
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5answers
1k views

Kernel panic error

We have a dedicated server with software RAID1 and one of the disk failed recently. The disk was replaced but after rebuilding the array and rebooting the server freezes with a Kernel Panic message ...
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1answer
456 views

Raid 1 Mirror - weird data loss for 1 month

I have been running windows software RAID 1 (mirror) on Windows 2008 R2 for a while and recently I experienced something very odd, hope someone can help explaining and share your view. Yesterday (Mar ...
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2answers
11k views

Proliant RAID 1 Rebuild Questions

I have a HP Proliant ML350 G5 server that experienced a power supply failure overnight. The power supply was replaced but unfortunately it got restarted with only 1 disk in the RAID 1 set plugged in. ...
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3answers
3k views

Linux Software RAID1: How to boot after (physically) removing /dev/sda? (LVM, mdadm, Grub2)

A server set up with Debian 6.0/squeeze. During the squeeze installation, I configured the two 500GB SATA disks (/dev/sda and /dev/sdb) as a RAID1 (managed with mdadm). The RAID keeps a 500 GB LVM ...
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4answers
95 views

Breaking a RAID 1 as a way to Provision systems?

Suppose that I have a nix system whose filesystems are entirely supported by two drives in a RAID 1. If I were to breakdown that RAID, could I then use one of the disks to recreate the system on ...
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1answer
174 views

Switching from Raid1 to Raid10

we are running a Dell Server with a PERC5i Raid card using a Raid1 setup. Now we are hitting a performance problem with our harddrive performance and think about switching to Raid10. Which steps are ...
1
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1answer
229 views

Linux RAID1, with reads restricted to one disk

I'm looking for a way to replicate a all changes on a filesystem between two disks in a master->slave setup. One of the disks is much faster for reads, so I would like to direct all reads to this ...
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2answers
460 views

DELL PowerEdge 2850 - How to change PEDC 4e/Di from RAID-0 to Raid-1?

SERVER : PE 2850 RC: PEDC 4e/Di Raid Config: Raid-0 (Current) Disk: 2 X 300GB I have very little in this server space, Recently I got a server PE 2850 and trying to change the RAID configuration ...
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4answers
811 views

CentOS 5.2 not detecting Raid 1 on new Dell R710

I've tried recreating the RAID, but every time I get to the section of the installation where it asks which hard drive to use, it claims there are none available. I currently have two 300GB Seagate ...
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4answers
797 views

Adaptec HostRaid RAID1 1/2 of HDD capacity

I have a server with Adaptec HostRaid controller. It has 2x 2TB drives. If I go to create a RAID0 array (striped), it will set the array's capacity to 2TB, when I go to create a RAID1 array (mirrored, ...
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1answer
283 views

Encrypted partitions with redundancy on ubuntu server

Hey I have to make a file system with an encrypted partition with on ubuntu server. something like Unencrypted: / - 10 GB /home - 10GB /var - 5GB -------------- Encrypted: /opt - 50GB This I can ...
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2answers
1k views

How to make a Linux software RAID1 detect disc corruption?

This is one of the nightmare days: A virtualized server running on a Linux SW-RAID1 runs a VM that exhibits random segfaults in seemingly random codechunks. While debugging I find that a file gives ...
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1answer
3k views

How to move 100mb hidden system reserved partition on Windows Server 2008 R2 to other drive?

I have a server with two 1.5TB hard drives. I was going to install a Windows Server 2008 R2 and create software RAID1 using Windows Disk Management Utility. I instaleld Windows, open this console and ...
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4answers
2k views

Extracting data from a RAID 1 array with out original controller

A Dell x346 server crashed (motherboard went bad) and I need to get a few files off of the hard drive. They are 2 SCSI hard drives in RAID 1. As far as I know both drives are fine. Can I just put one ...
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1answer
742 views

MD RAID 1 with external bitmap doesn't fully resync

I have an interesting configuration: dual boot system with a RAID 1 that needs to be visible in both Windows and Linux. The Windows install is Win 7 Enterprise, and the Linux install is Kubuntu 10.04. ...
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3answers
723 views

Would unplugging a drive simulate a drive failure?

I just set up a RAID 1 array, 2 2tb drives mirrored. I am wondering what will happen if one were to fail. Would unplugging one of them be a valid test? I am using the Onboard controller of an asus ...