RAID, an acronym for Redundant Array of Independent Disks (sometimes incorrectly referred to as Redundant Array of Inexpensive Disks), is a technology that provides increased storage functions and reliability through redundancy. -Wikipedia

learn more… | top users | synonyms

3
votes
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 ...
0
votes
1answer
793 views

Would FreeNAS with RAID-6/10/50 work well with VMWare ESXi?

I am considering expanding my single ESXi server set-up with a SAN and another ESXi server, because I am planning to update the Windows Server 2003 virtual machines to Windows Server 2008. The servers ...
1
vote
2answers
270 views

One of my drives thinks that it is part of a raid array, if I delete the array (which is broken & empty) will I lose data?

I had a striped RAID array a long time ago. One of the drives failed and I just used the other drive as a stand alone disk. I have now switched my BIOS back to RAID mode and have created a RAID5 array ...
1
vote
1answer
1k views

Raid Ready Hard Drive vs Standard Hard drives

What is the difference between normal data hard drives and Raid Ready Hard Drives? I am planning to build a server with 6x2TB hard drives and i have been quoted raid ready Hard drives nearly at 250$ ...
0
votes
1answer
546 views

esx 4 vmfs3 RAID REBUILD

I have a ESX 4.1 Server with a storage on RAID 60. After the rebuilding of the RAID the vmdk-files are not working in my VM. On starting VM i have this error Cannot open the disk ...
3
votes
1answer
4k views

How do I migrate disks from one Dell PE 2850 to another?

I had a Dell PE 2850 die and I need to move its SCSI disks over to another PE 2850. These disks were in RAID1. I tried moving them over and just hoping the PERC would do the right thing, but it ...
3
votes
3answers
1k views

How can I speed up the build of a Logical Drive on a HP Smart Array P411?

Is there anything I can do to speed up the creation of the HP Smart Array logical drives? Does creating too many drives at the same time affect the overall performance?
0
votes
1answer
256 views

Need to merge virtual disk into one on a dell server, anyone know a better way?

Background Info: Raid controler is: PERC 6/i Raid 1 3 virtual drives C:58GB, E:97GB, and F:772GB I need to combine C and E C is windows install and there is no data on E The way I was going to do ...
6
votes
2answers
5k views

How to do the equivalent of Synology Hybrid Raid on Linux myself?

http://forum.synology.com/wiki/index.php/What_is_Synology_Hybrid_RAID%3F Synology is just Linux and uses LVM. How do their tools automate LVM to achieve what they call their Hybrid Raid?
0
votes
1answer
218 views

backuppc similar software?

I have been using backuppc backup software and really like it, but due to it's use of hard links (and possible other issues?) it will only run under linux and will not work with certain file systems, ...
0
votes
1answer
360 views

windows 7 Mirror Failed Redundancy

I've been trying to setup software Mirror RAID using the Windows 7 Disk Manager. However I'm getting the "Failed Redundancy" error no matter what I do. I think the exclamation icon is appearing on ...
1
vote
1answer
83 views

RAID Battery Backup without Caching

Is there any point/benefit to having a battery back unit on a raid controller if write caching is disabled?
1
vote
1answer
1k views

Linux software RAID: --auto-detect finds whole drive, not last partition

My laptop, running Ubuntu Natty, is partitioned like so: /dev/sda1: 500MB, /boot /dev/sda2: 148GB, / sda2 is a software RAID1 with 1 device. This is intentional -- I periodically reshape the array ...
3
votes
3answers
618 views

Event Logging for RAID fault in 2008 R2

does anyone have a solution for logging an error/critical entry to the event log in 2008 R2 when RAID has an issue? I really want to set up email alerts for when this happens. I'm using the MS builtin ...
0
votes
2answers
426 views

TurnKey FileServer - RAID on Dell Precision 670

I have a Dell Precision 670 with 2 x 2TB Sata HDDs, once the machine boots, I press CTRL + A to get into the Adaptec Raid utility and configured a RAID 0 Array making it 2TB almost. I then mark the ...
1
vote
1answer
506 views

XServe Raid with Ubuntu 10.04 problems

I have an Apple XServe RAID connected via fibre channel to a Dell Poweredge R610. This server is mainly for hosting subversion repositories, and storing disk images. In the past 6 months or so we ...
3
votes
2answers
3k views

Replace faulty Dell PERC 5/i controller without losing data

Is it possible to replace a 5/i controller without losing the data on the array? Can I import this as a foreign configuration? Any "gotchas" or tips to make this smoother?
2
votes
1answer
359 views

Growing a LVM volume with striping

I'm considering using LVM striping over several EBS volumes. So let's imagine the following case: Volume group DATA is created with 3 physical disks sdf1, sdg1 and sdh1. I create a logical volume ...
4
votes
3answers
3k views

Upgrading RAID 5 array drives in a DELL 2950 with Perc 6i controller

We currently have a DELL 2950 with 4 x 400Gb 10krpm SAS drives in RAID 5, and one of those drives has failed. Not having any identical spares (don't slap me, it's not my fault), and not being able to ...
3
votes
1answer
82 views

Office Web Applications Hardware Requirements

I am looking at deploying Sharepoint with Office Web Applications and trying to get the approvals for the necessary hardware. Looking at the requirements from Microsoft ...
3
votes
1answer
307 views

reshaping raid and growing raid

This is a two part question. 1) Can you reshape raid 5 to 6 with mdadm on linux (fairly sure you can, but cant get mdadm to accept it) 2) Can you do 1) while also growing the array in one go ?
0
votes
3answers
318 views

I need to provision 30TB for a server. Does this process have anything to do with Logical Memory?

I'm currently buying a server that NEEDS 30TB of storage, 15TB of which is logical and 15TB is physical. However the towers only allow 8 2TB 3.5 inch HDD's, which gets me to 16TB. How do I get ...
2
votes
3answers
766 views

Active Drives and Spare Drives (RAID10)

I'm setting up software RAID on Ubuntu Server 10.04; specifically RAID10. It's asking for the number of active devices for the array and the number of spare devices. I know RAID10 is two mirrored ...
7
votes
2answers
537 views

convert 1x2TB HDD with LVM into 2x2TB HDD with RAID1+LVM or with LVM mirroring?

I have Ubuntu server with 1x2TB HDD and 1x128GB SSD (unused). There are 2 partitions: /boot, and a physical volume for LVM, which has 1 group and 5 logical volumes: /, /var/log, /home, /srv, /tmp. ...
0
votes
2answers
340 views

ServeRAID 8i setup

I purchased a second hand IBM eServer x345 with ServeRAID 8i and 3x 36GB SCSI hard drives. I'm having difficulty setting up an operating system as the drives don't appear in either Arch or Ubuntu ...
5
votes
1answer
631 views

Home-grown SAN — topology ideas?

I'm interested in hand-rolling a SAN solution on Linux with the following technologies: iscsi mdadm raid lvm multipath xfs/gfs/??? teamed NICs Hardware-wise, I'm thinking of 2 x gigE (or better) ...
10
votes
3answers
12k views

How do I rename an mdadm raid array?

I have assembled a new raid array to replace an old one. However, this new array got assigned an automatic name of /dev/md127 and I want to rename it to /dev/md3, so that I don't have to change ...
3
votes
1answer
4k views

mkfs.ext4 is taking hours to complete on 4 TB RAID 5

I am running mkfs.ext4 on top of LVM on a RAID 5, and it is taking hours to complete. It's a 3 TB, four disks setup, and I'm just doing: mkfs.ext4 /dev/md0 My stripe size and width seem OK. ...
0
votes
1answer
311 views

Best RAID Configuration for HyperV VM

I plan to make an HyperV server with 5 or 6 vms, here is the hardware : Xeon L3426 4core 8 thread 16 go ram 2*2To HDD Dell H200 Raid Controller (RAID 0 OR 1); and VMs contains that : 4 vms are ...
1
vote
1answer
710 views

R710 & MD1220 PERC questions

I'm purchasing a new database server (R710) with a direct attached storage (MD1220) device behind it. I'm not up to date on the latest RAID technologies and needed some advice. The MD1220 I've ...
5
votes
3answers
4k views

Making SATA disk write cache safe

Supposedly (see, e.g., a question about it here), with NCQ enabled drives, the drive write cache is supposed to be safe, as in it doesn't like to the OS about data being committed to the platters when ...
0
votes
1answer
4k views

Windows Server 2003 can't find RAID array during install on Dell PowerEdge 2850

I'm trying to install Windows Server 2003 Web Edition on a Dell Poweredge 2850. I've configured the RAID following these instructions: ...
1
vote
1answer
277 views

Kickstart partitioning help

I need to configure a RAID using a kickstart file. I have four hardrives sda sdb sdc and sdd on which I plan to set-up the following partitions: hda1 and hdb1 I want them to be set as a 8GB primary ...
2
votes
1answer
316 views

SQL Server on EC2: What way do i set up the EBS

Good morning. We have a service with a SQL box on Amazon EC2 and, as suggested on this question, we are using EBS to store the data... the problem is, What is the best way to setup the storage? At ...
3
votes
1answer
282 views

Putting a spare Raid device back to active state

I have a problem with my Raid setup. I have 3 disks in my Raid: md2 : active raid5 sdc3[3](S) sdb3[4](S) sda3[0] 2925532672 blocks level 5, 64k chunk, algorithm 2 [3/1] [U__] md1 : active ...
1
vote
1answer
917 views

ProLiant DL380 G4 ESXi host - How to check RAID status of local storage

In a data center we have a few ESXi hosts. We're migrating all the data off the machines, but first we would like to check the RAID/SMART status of the local drives. Is there any way to do this via ...
1
vote
4answers
2k views

mdadm assembles with drives instead of partitions

I have a RAID 5 array built from partitions on 5 drives - /dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sdd1, and /dev/sde1. When I assemble the array manually, it works fine. Unfortunately, there seem to ...
0
votes
1answer
173 views

Partition Centos | Raid

I have 4 HDD, the system is installed on /dev/sda2 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 884G 2.1G 836G 1% / /dev/sda3 2.0G 159M 1.7G ...
0
votes
2answers
374 views

add virtual drives (raid) without needing to reboot dell h700

Is it possible to add a virtual drive without needing to reboot the computer? Or actually what I really want, is some way to just pop in harddrives (using the hotswaps in the backplane), and start ...
3
votes
4answers
1k views

Running swap on RAID10 or RAID5?

In follow-up to this previous question (and it's excellent answer), I am curious to know if running swap on a RAID5 might not be better than on a RAID10. My thinking is that you might lose a bit on ...
0
votes
1answer
485 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 ...
2
votes
1answer
763 views

Recovering Accidentally Destroyed LVM2 Information

Ok, so I'm stupid and made a serious and grave mistake. On my linux box running Ubuntu 10.10, I have a 1.5TB RAID array that I had originally setup using the instructions located here: ...
1
vote
1answer
224 views

Windows Software Raid 0 over hardware raid 1 does this equal a hybrid 1+0?

I've got a server running windows 2008R2. The hardware controller can only do Raid 1 or 0 and it's hotswappable. I have 4 drives (hot swappable hardware), each pair is mirrored (raid 1). I'd like to ...
2
votes
3answers
257 views

Which RAID5 configuration is faster?

I have RAID controller with 24 SATA disks. Which configuration is faster? One RAID5 with all disks. Six RAIDs with 4 disks in each group.
0
votes
1answer
199 views

Scale a highly transactional SQL server

I’m looking to upgrade one of my site servers. The site currently executes around 20m sql queries a day and this is growing quite fast. Right now IO throughput is a real issue, so my idea is to move ...
2
votes
2answers
374 views

Partions, RAID, LVMs, and Encryption

I have an existing production server that is running 4 drives each 750 GB in size in two software RAID levels. RAID 1 for the /boot partition and RAID 5 for the rest of the partitions including the ...
0
votes
2answers
174 views

Is my new raid-5 array at risk because I have a non-raid boot disk?

So I have just set up a 3x2TB software raid-5 array on my Ubuntu Desktop 10.04. I replaced three existing non-raid disks, but left the boot disk non-raid (the way it has always been). Q: If the boot ...
1
vote
1answer
116 views

What is the progression of performance degradation on large RAID volumes as percentage used increases?

I understand that performance degrades with single disk volumes and small RAID volumes as the volumes fill up. Some admins say that they perceive slowdowns at 80% and use that as a general rule of ...
0
votes
2answers
228 views

Failing raid controller need help replacing it without data going away

I've got a server running Windows 2003 and the following error event is showing up in the system log: The description for Event ID ( 9 ) in Source ( fttxr5_O ) could not be found. It contains the ...
2
votes
3answers
2k views

How to undo an mdadm RAID 1 without losing data

I have a two disk, RAID 1 set up from mdadm. Long story short, turns out this server has an actual RAID controller, so a hardware raid would be more preferable than the software raid. In addition, the ...