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

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Rebuilding raid1 array fails device busy

I had a hard disk fail on my server, so I got the provider to replace the hard disk. Unfortunately I forgot to do mdadm /dev/mdX --fail /dev/sdaY for the disks. Now after a reboot, I get this: ...
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19 views

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 ...
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40 views

RAID 1 fault “ Status Ready for Rebuild : Rebuild Percentage Complete 0%”

Our RAID 1 system partition failed on our Windows 2008 SBS (physical environment). We still have disc 1 running but the 2nd disc in the raid is a failure. To add to the complication, disc 1 has bad ...
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26 views

mdadm raid1 hard-drive to be mounted as standalone disk [duplicate]

My motherboard has crashed certainly due to a surge pb. I was using a linux debian, and my DATA were in RAID1 with mdadm. My hardrive are anymore clean. With another desktop having also linux debian ...
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26 views

Intel RAID 1 states changes during install FreeBSD 10

I working on my all servers with FreeBSD 7.x / 8.x on mainboards with Intel RAID 1. I tied to install FreeBSD 10 on machine with Intel Z97 chipset and RAID 1 (mirror). During install process, all RAID ...
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26 views

create parition for xen with lvm on raid-1

First I don't have any experience creating xen, lvm and RAID-1 server, thus after several reading I stumbled upon this ubuntu documentation to install xen. BUT, because in the documentation it ...
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21 views

With a the built-in Windows software-RAID1 mirror, what procedure does Windows follow on an unreadable sector? [migrated]

For modern retail hard drives, the Unrecoverable Read Error (URE) is around 1x10E14 bits. This translates into one bad sector for every 12 terabytes of data read. For enterprise class hard drives, its ...
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35 views

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 ...
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83 views

Server RAID0: one hdd is more %busy then the others?

I'm testing 3 servers with RAID0 with 4 disks. During my test I noticed on all 3 servers that one of the hdd's is more %busy and has much higher averige IO wait (almost 4x higher then the other ...
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1answer
68 views

Hard drive error message in Virtual Root Server

After noticing a high load on our virtual root server (2 x 1 TB RAID 1 Subset) I have found these messages in /var/log/messages (CentOS): kernel: ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action ...
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1k views

Configuring RAID1 on HP Proliant Microserver N54L / Ubuntu 14.04.1 LTS [duplicate]

I've bought a N54L and fitted two 3GB drives. Keen to get set up with RAID1. BIOS: SATA controller mode set to "RAID" RAID Option ROM utility: both physical drives set up as one logical drive When ...
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47 views

Why would a raid 1 “break” on it's own?

So I went out to look at a video server the other day that had degraded raid issues. I've read about the various raid levels and how they are supposed to work, but the behavior I witnessed here has me ...
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69 views

How to reliably and conveniently mirror 2 drives in hotswap hdd racks (likely without RAID1)?

I have the following situation: Need to store 1 original + 1 copy for data sets that are 1-2 TB in size Need to use consumer SATA drives, 1 for original, 1 for copy Need to store 50+ such data sets ...
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2answers
70 views

Raid 1 can not sync with new Drive . its stopping at 30 %

i had trying to add new HDD in place of Falty HDD. but new HDD can not sync with old one .sync process shown up to 30 % after that its stopped . cat /proc/mdstat Personalities : [raid1] md2 : ...
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1answer
156 views

Windows Server 2012 and recognizing RAIDed SSDs as an SSD

Problem: Because defragmenting is detrimental to SSDs and decreases their performance/lifespan, its important that modern OS's use TRIM instead of defragmentation. If an SSD is incorrectly recognized ...
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1answer
178 views

Upgrade SATA drive on Dell Poweredge 1950, RAID 1, Ubuntu server

My current set up is a Dell PowerEdge 1950, two 250GB SATA drives, RAID 1, OS is Ubuntu server. Using it for running OTRS (open source help desk). I'd like to upgrade the drives to the maximum ...
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1answer
26 views

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 ...
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155 views

Reassemble RAID 1 array from old system

I recently upgraded my OS from RHEL 5 to 6. To do so, I installed the new OS on new disks, and I want to mount the old disks. The old disks are listed as /dev/sdc and sdd in the new system, they were ...
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1answer
73 views

How to copy RAID 1 HDDs from one server to another Identical server

I have one IBM X3100M4, type 2582 windows server and having 2 x 500 GB HDDs in RAID Copy. Now brought new server and having blank HDDs. How can I copy RAID HDDs from Old server to new server? I have ...
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1answer
43 views

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 ...
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75 views

md raid1 reading from one disk only

I have two identical HDD in a linux software raid 1. I observed a mostly reading load on this raid device, with the process showing mostly iowait. iotop shows about 75% disk utilisation overall. If I ...
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147 views

Solaris 9: Degraded mirror unmanageable with raidctl after drive replacement

We have a pair of Sunfire v20z's (WITH LSI MPT raid) that have each had one drive in their mirrors die. bash-2.05# cat /etc/release Solaris 9 4/04 s9x_u6wos_08a x86 ...
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27 views

change harddisk AES encryption mode on server with raid1

I've got a server running ubuntu 12.04 LTS with encrypted root in a raid1. Due to the vulnerability of 256-bit AES in CBC mode on LUKS encrypted partitions I'd like to change the encryption mode of ...
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81 views

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 ...
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65 views

Transfer from RAID-1 to RAID-0 — easy as cloning?

I have a RAID-1 of 1TB drives using on-board RAID. I have 2 new 240GB SSDs I want to place in RAID-0. This is Windows Server 2012. I know with disk cloning/transferring that it is important going ...
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2k views

What is the performance implication of hardware vs software RAID in 2-disk RAID0/RAID1 setup?

I am choosing between two similar models of servers, one of which has software RAID, while the other hardware one. Servers in question are SYS-E32-1 and SYS-E32-3 from So you Start (an OVH brand) and ...
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213 views

Rescue a Raid 1 from a dedicated server

I have a dedicated server (Hetzner EX4). One day, I rebooted the server and it wouldn't start. customer service told me that one of the hard drive was faulty, and activated the rescue system (Linux). ...
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133 views

Disk Capacity RAID 1 to RAID 10

I have a 4-bay NAS with two 2TB hard drives in a RAID 1 configuration. I was planning to upgrade it with 2 additional 4TB drives to a RAID 10 configuration. Now the new capacity I will receive with ...
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72 views

How to proceed to switch raid 1 disk from secondary to primary?

I have a Dell PowerEdge T100 server with Windows Server 2008 and raid1 configuration. I've just replaced the secondary disk by a new one. (it was pred fail = yes) Now, the raid1 status is ok and the ...
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294 views

Dell RAID1 Pred Fail Yes

I have a server with RAID 1 configured that was running too slow.. some applications does not even run. I entered SAS Config. Utility and I checked that RAID 1 was in status 'not synced', but I was ...
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46 views

Files missing after RAID1 restore

I have encountered unpleasant situation. Given mdadm RAID1 of 2 HDD on server. Yesterday one of HDDs completely dies, other shows bad SMART status but was in accessible state. Mdadm showed "clean, ...
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346 views

Is it possible to enable RAID 1 on an already in-use HP Proliant DL380 G5

I have a HP Proliant DL380 G5 with two HDDs in RAID 0 (Stripe)(72GB+72GB). It has been running Windows Server for quite a while now and has 30GB of occupied space on a stripted volume. I've now ...
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141 views

Split a Dell PERC 6/i RAID-1 mirror to temporarily to add additional storage

I need to tidy some disk partitions in Windows Server 2012, but don't have enough storage space, and all drive bays are in use. I'd like to split the mirror, use one of the disks as temporary storage ...
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2k views

Setting up software RAID 1 on System Partition

I have a Windows 2012 R2 Essentials box I'm building (should be the same concerns as a Server 2012 or Server 2012 R2 box). I'm attempting to mirror the system disk (identical 750GB SATA drives) but I ...
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HP DL320e Gen8, 3TB drives, Windows Server 2012 R2 - HDD full capacity alocation difficulties during installation

One interesting task to do but not so easy as i thought. The server is HP DL320e gen8, The main difficulty is with partitioning the RAID1 (2x3TB HDDs) during the installation on 2 partitions (System ...
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53 views

does raid 1 backup also backup mysql updates?

I have a mirrored RAID 1 server. This server has mysql databases. If I run a query to update a mysql database, does this update also get updated on a RAID 1 mirrored setup or do I need a different way ...
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80 views

Recovering LVM RAID-1 on different computer with only one drive?

I have a drive out of an old LVM RAID-1 that's been sitting for a while. I think the array contained a bunch of my photos from years ago (archived online) but I'd like to get at the original data and ...
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1answer
40 views

debian stable raid autogrow filesystem database

I need to setup a debian stable system meeting the following needs: Hard disks should be mirroring : Raid 1 Filesystem(s) should autogrow if possible (just in case we replace one hdd with a bigger ...
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191 views

SQL Server 2012 RAID Setup and Performance [closed]

At my company we are in the process of setting up a new SQL Server 2012 box. We have 6 physical drives with 3,000 gigs each. We are considering two different RAID configurations and are wondering ...
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111 views

raid 1 always degraded after pushing reset [closed]

I have Marvell hardware raid 1. After pushing reset or any other incorrect shutdown raid is degraded. Is it possible to create hardware raid 1 on other chips(intel chipset for example) for example ...
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1answer
62 views

rsync, dd and then add to RAID 1, could cause database corrupted?

Firstly I have a HDD which has been setup as RAID, type Volume, not RAID 0 or RAID 1 ... and I wanna add one more HDD to setup a RAID 1 array. These bellow steps are what I've done. Detach from ...
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1answer
291 views

LVM RAID 1 for root

I have LVM RAID 1 (not mdadm RAID 1, but exactly LVM2 RAID 1) for my root partition. I would like to make my system boot without either of the HDDs where the underlying PVs of the root LVM partition ...
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33 views

pb with fsck at boot and no-existent partition (raid1 soft, 1 disk absent)

My goal is to install debian with raid1 on 2 disks. During the install of debian, it's not possible to put a boot flag on a raid partition, so /boot is not in raid1. but I try a similar thing. (/ and ...
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281 views

replacing failed hard disk in raid 1 on dell emc cx300 [closed]

how can I replace failed disk in slot 12 in raid 1 on san dell emc cx300 I HAD Configured the san with hot spare hard disk in slot 13. Is it enough to remove it from it's slot an put instead of it ...
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136 views

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 ...
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660 views

How to delete removed devices from a mdadm RAID1?

I had to replace two hard drives in my RAID1. After adding the two new partitions the old ones are still showing up as removed while the new ones are only added as spare. I've had no luck removing the ...
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2answers
1k views

Clonezilla is not able to clone a RAID 1 disk

I have a HP Server DL320 G5. There are two SATA hard disks configured as RAID 1 through HP embedded RAID controller. Server OS is running GNU/Linux (Fedora) Server booted up with clonezilla live CD. ...
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440 views

Various problems with software raid1 array built with Samsung 840 Pro SSDs

I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: ...
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945 views

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 ...
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583 views

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 ...