Questions which refer to software RAID implementations.

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19
votes
8answers
76k views

How to get an inactive RAID device working again?

After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount ...
15
votes
2answers
6k views

combining SSD and hard disk in software RAID1?

Does it make sense to build a Linux software RAID-1 (mirroring) using an SSD and a normal hard disk? I want to combine the advantages of SSD (fast transfer rates, fast access times) with the ...
13
votes
7answers
11k views

Onboard RAID vs Software RAID

My motherboard, an Asus M4a79t Deluxe, advertises RAID 0/1/5 capabilities. My limited understanding is that onboard RAID is better than software RAID. Is this necessarily true? Is an onboard RAID ...
12
votes
2answers
10k views

Does software RAID 1 in Windows 7 improve read speeds?

Does software RAID 1 (mirroring) in Windows 7 improve read speeds? I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also ...
11
votes
11answers
56k views

What's the difference between RAID 1 software mirroring and Fake RAID?

I've just ordered two new hard drives for my main desktop and a copy of Windows 7 Professional 64-bit. I'd like to do a clean install of Windows 7 onto the new drives (leaving my old Windows XP ...
11
votes
2answers
7k views

Can I setup a software RAID in Windows 7 using Virtual Hard Disks?

Well, the title of my question pretty much sums it up, but let me elaborate. The main idea of what I want to do is as follows: 1) I have two separate hard disks, with nearly equal performance. I use ...
11
votes
2answers
555 views

Why am I seeing such low SMB transfer throughput?

Ok, there's a bit more to the story than the title implies. Background and Environment: I'm copying several TB from an older Ubuntu server to a newer Windows 2012 server over SMB. (Technically, it's ...
10
votes
3answers
17k views

How-to change the name of an MD device (mdadm)

Here is the output from mdadm -Esv: ARRAY /dev/md127 level=raid0 num-devices=2 UUID=d89d9d45:9a420812:c44c77eb:7ee19756 devices=/dev/sdb8,/dev/sda8 This is a v0.90 array. The question is as ...
10
votes
1answer
495 views

Where is the software RAID information actually written?

Like title says, where is the actual information which specifies which disks are being used, what order, etc...? I noticed while installing a linux distro that it was detecting a RAID array without a ...
9
votes
3answers
2k views

Any difference between Hardware RAID and Software RAID?

I'm building a new server (Small Business Server 2008), but I can't get the built-in RAID controller (AMD SB700) to work and have basically given up on it ever working with Server 2008. Fine. But my ...
8
votes
1answer
540 views

Find files affected by bad blocks with md-raid5 and LVM

I've been doing a lot of research on this topic over the last few weeks - and I think I'm close to completing my recovery, as much as is possible at least. To make a long story short, I'll just ...
7
votes
3answers
2k views

Will mirroring with an SSD improve read performance?

If you use Windows 7 to mirror a volume across an SSD drive and a mechanical hard drive, will the read performance be similar to a single SSD drive? I.e. is Windows smart enough to read from them ...
7
votes
3answers
3k views

optimal SATA SSD configuration in new PC

I'm sold on SATA SSDs for my next PC but since their prices grow un-proportionally to their size, I'm wondering what would be the best configuration for them (for OS and Programs) would be: 2 SSDs ...
6
votes
4answers
3k views

RAID 1 on 2 external HDDs

I have an Ubuntu 12.04 server on my old laptop. Its HDD (160 GB) is too small for the file storage I need, so I'd like to attach a couple of external HDDs to it (through USB ports). The data I'll keep ...
6
votes
3answers
12k views

Creating a RAID1 partition with mdadm on Ubuntu

I'm trying to set up a RAID1 partition on my Ubuntu 9.10 workstation. On this dual-boot system, Ubuntu is running from a separate drive (/dev/sdc - an SSD that is quite small, which is why I need ...
6
votes
2answers
3k views

mdadm RAID Fast Setup with Empty Drives?

I am recreating some RAID5 disks as RAID6 with mdadm. There is no data on the drives that I care about. Setting up RAID takes a while to setup the shape - I accept that when there there is data that ...
6
votes
1answer
2k views

A ZFS or LVM or MD redundant heterogeneous storage proposal

I have the same problem most people have: how to create a reliable personal storage solution with the fact that: Hard drives fail with alarming regularity. Losing files is unacceptable. I will buy ...
6
votes
3answers
4k views

Raid1 with active and spare partition

I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was ...
5
votes
1answer
13k views

How can I add a RAID 1 array in Ubuntu 10.04?

I have an existing Ubuntu 10.04 desktop system setup and running on a hard drive (drive A). I'd like to add two more hard drives (drives B and C, same size) to the system and mount them as a RAID 1 ...
5
votes
2answers
11k views

Disk is apparently in use by the system

I've just fitted two disks to my home server. I'm trying to format and then raid them but I'm getting a problem that hours of Googling hasn't resolved this. The error that I'm getting is: # ...
5
votes
2answers
3k views

Linux RAID1 with only One disk

I have a hypothetical situation in which I installed my operating system using a RAID1 mirror. At some point I decided that this setup was overkill, my machine isn't system critical, I value doubling ...
5
votes
1answer
1k views

Automatic Notification of Degraded RAID Array in Ubuntu

I'm running Ubuntu 10.04 on top of a RAID-1 array. Out of curiosity, I decided to bring up the "Disk Utility" program to inspect the status of my array. To my surprise, the array was listed as ...
4
votes
3answers
3k views

Hardware RAID - what happens if the motherboard or controller fails?

I want to set up a RAID 5 array in a machine that has an intel motherboard. It has built in raid (sata). My concern is what happens if the motherboard fails? How can I take those hard drives ...
4
votes
2answers
1k views

P4 vs. I3/i5 *T in power consumption and performance

I am running an Intel P4 prescott with HT on my home server (linux file server on encrypted disks on software-RAID5 and virtualisation host for three further machines). The performance for this ...
4
votes
3answers
515 views

Several questions about software and onboard RAID 5

I have a few questions on how software and onboard RAID 5 compare: Is there any way to add a disk to an existing RAID 5 array using either software or onboard RAID? All motherboards I'm interested ...
4
votes
2answers
350 views

Harddrives to NAS

Is it wise to go for same brand/model for all the drives in a NAS, or is it ok to mix? What about mixing between different raid groups?
4
votes
4answers
2k views

Software RAID on dual boot Windows and Ubuntu

Can I successfully implement a software RAID even when I use both Windows and Ubuntu? What software tools in both OSes that can help in this regard? I have 1TB sata on ASUS m4a78T-E and I wish to ...
4
votes
3answers
13k views

How do I reactivate my MDADM RAID5 array?

I've just moved house which involved dismantling my server and re-connecting it. Since doing so, one of my MDADM RAID5 arrays is appearing as inactive: root@mserver:/tmp# cat /proc/mdstat ...
4
votes
3answers
323 views

Three-way mirrored RAID in Windows 7?

I sometimes find bit-rot in some of my files. This is rare, but does happen. It annoys me that this is a) undetected for long periods of time and b) not fixable (except from backups), even with the ...
4
votes
2answers
311 views

Unable to create software RAID volume in unallocated space on primary disk

I have two disks that I'd like to partially combine into a striped volume (RAID0). Disk 1 contains the primary partition that boots into Windows 7 Professional, disk 2 is currently not used. On disk ...
4
votes
1answer
710 views

What will happen with my RAID5 after motherboard change?

Currently I have ASUS P5Q-EM and 3 HDD in RAID5 using it's on-board RAID controller Intel ICH10R. I want to bye a new motherboard, for example, Gigabyte GA-EQ45M-S2 which also have on-board RAID ...
4
votes
2answers
12k views

How to install Windows 7 onto software RAID-0

I recently got a new laptop (Asus G73JH-A2) which has two identical hard drives in it. Unfortunately the motherboard does not have a RAID controller. What I would like to do is run the drives in a ...
4
votes
6answers
13k views

How do I convert a Windows 7 Ultimate install to Raid 0?

I'm trying to convert my system to RAID 0 and so far I found contrasting opinions on the process. Somebody says Windows 7 can't boot from virtual volumes, somebody says it can. My ideal setup would ...
3
votes
2answers
5k views

Can you add a hard drive to a RAID?

I've decided on creating a NAS running FreeNAS using a software RAID 5 setup. I want to start the RAID with 2x2TB drives and slowly add more 2TB drives as I go. Is this possible? If I have a full RAID ...
3
votes
1answer
650 views

mdmda raid 1 - spare drive after SATA cable change

Yesterday my hoster changed a SATA cable of one of my hdds, when my server came back up again cat /proc/mdstat showed this Personalities : [raid1] md124 : active raid1 sda1[0] 4193268 blocks ...
3
votes
1answer
3k views

Setting up Intel RST on Ubuntu 12.10

I want to know if it is possible to set up caching using my notebooks mSSD that runs ubuntu 12.10 and Win 7 on the HDD. I use ubuntu much more and would prefer to cache files that it uses rather than ...
3
votes
1answer
3k views

Sharing an Intel RST between Windows and Linux

I have an Intel z68 motherboard, which makes use of Intel Rapid Storage Technology (RST) -- Version 10.5. If possible, I'd like to split my RAID 1+0 RST drive equally between a Linux and Windows ...
3
votes
3answers
3k views

Bad performance with Linux software RAID5 and LUKS encryption

I have set up a Linux software RAID5 on three hard drives and want to encrypt it with cryptsetup/LUKS. My tests showed that the encryption leads to a massive performance decrease that I cannot ...
3
votes
2answers
2k views

Is it normal for Windows Software Raid (Mirroring) to slow a drive's performance?

I've been doing some performance tests on a few of my drives lately, trying to figure out which combination of drive/raid-level(or not) will give me the best performance (for Hyper-V incase anyone's ...
3
votes
2answers
339 views

Need hard disk recommendation for linux home server

I'm planing to build a little linux homeserver. It will mainly be used for storage and maybe as an media pc. I plan to build a software raid5 with 4 1.5TB or 2TB hard drives. I already decided to ...
3
votes
2answers
645 views

Windows 7, raid 1 with advanced format drive

I had a nice software raid 1 (using windows 7 raid) working when one of my drives failed. I replaced it by another one (WD blue 1 TB) which uses 4k sectors, and this makes windows unhappy (Cannot ...
3
votes
2answers
452 views

Is Online Capacity Expansion possible in Windows 7 software raid?

Many low-end raid cards now offer Online Capacity Expansion (OCE) and Online Raid Level Migration (ORLM). This explains both. Can I do OCE or ORLM on my Windows 7 software RAID to add disks and/or ...
3
votes
1answer
228 views

I'm trying to mirror drives of the same model, but one appears to be slightly larger

I'm trying to mirror a drive using Disk Management in Windows Home Server 2011. The target drive (Disk 1) is the exact same model as the source drive (Disk 0), but the target drive appears to be 1MB ...
3
votes
1answer
954 views

ubuntu 10.04 softRAID 5 partition scheme

I'm trying to create a RAID 5 array which will contain the Ubuntu installation itself. I tried this partition scheme: 2.0 TB for / 6.0 GB for swap This was as per the instructions provided by ...
3
votes
1answer
2k views

Resize a RAID 1 volume on OS X Snow Leopard - how? (Note: software raid)

I've scoured the Internet in search of an answer to this question, and as usual with OSX-related topics, I often don't find any deep-dive technical explanations sufficient enough to feel confident ...
3
votes
0answers
73 views

mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?

My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. ...
3
votes
0answers
1k views

Is it possible to use software raid in Windows 7 on the boot partition?

I want to use RAID 1 on my workstation configuration at work, and I've been looking at using the build in mirror functionality in Windows 7. When you click on the add mirror option it presents you ...
2
votes
3answers
826 views

Can I use an entire drive for as a software raid member?

Can I use /dev/sda and /dev/sdb for my RADI1 configuration? Or do I first have to partition both with a single Linux raid partition?
2
votes
3answers
224 views

RAID level hard drives?

My Motherboard has 4 internal SATA ports. I am considering a linux software raid. I plan to use this for backing up my work movies, music etc Do I need to spend the money on RAID Level drives? Or am ...
2
votes
1answer
351 views

Connecting 6 hard drives with 4 available SATA connections

I'm building my first home NAS right now, and I have a Mini-ITX motherboard with 4 SATA connections. I'd like to connect 6 hard drives in total and (preferably) use software RAID. My question is: ...