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

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Backup data from RAID 1 disk out of its server

I'm facing with a pretty easy problem in my opinion. I've extracted a working disk from a RAID1 and I'm looking to copy only data (FS and RAID configuration doesn't matter) into another location (...
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How do I mount a raid disk

So I screwed up my grub.conf file on a CentOS system and I'm in recovery right now (it's only a test dedicated server). My disks are /dev/sda1 and /dev/sdb1 (RAID 1). Now I need to mount /dev/sda1 and ...
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116 views

Multiple RAID Configurations?

Is it safe or reliable to incorporate multiple RAID Configurations on a Server such as this: RAID-1: Main Drive OS RAID-5: Storage Drive (Engineering Projects) RAID-5: Storage Drive (Engineering ...
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1answer
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How to setup guest-os raid 1 with vmware esxi?

In my last questions I didn't make myself clear, so I will do my best to explain it. I have a server with esxi 5 installed on it. I am not able to setup hardware raid atm, and need a workaround. ...
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2answers
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MegaRaid damaging disk by set a drive to “Offline”?

I wanted to test performance in a RAID10 with a "damaged drive". To simulate this situation I've set a single drive to "Offline" by using this command: MegaCli -PDOffline -PhysDrv [45:12] -aAll The ...
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2answers
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mdadm failure detected on one partition

I received this rather nice email today suggesting one of the drives in a RAID1 array has failed. A Fail event had been detected on md device /dev/md4. It could be related to component device /dev/...
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402 views

RAID setup for maximizing data retention and read speed

My goals are simple: maximize data retention safety, and maximize read speeds. My first instinct is to do a a three drive software RAID 1. I have only used fakeraid RAID 1 in the past and it was ...
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1answer
366 views

ASUS PIKE 6480 doesn't work with debian?

I have DIYed an 1U server with [ASUS Z8NA-D6] motherboard, PIKE 6480 extended RAID card, and four SAS hard disk. And I can find this extended card's module in the linux kernel called mvsas. But fail ...
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Getting Proliant P212 disk SMART diagnostics in Centos 6.2/RHEL

Does anyone know how I can monitor (either gui or shell) the health status of my SATA disks via the P212 (256Mb) controller card of my ProLiant ML110 G6 ? I've currently got Centos 6.2 64bit installed ...
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2answers
16k views

How to setup fake raid for vmware virtual machines?

I have a vmware esxi 5 running on a server with ssd and two hard drives. The server comes with software lsi megaraid and intel rapid storage raid. Neither of them work with esxi. I need to somehow ...
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Megaware Raid 10

I have 22 disks and would like to create a Raid 10. Unfortunately my raid controller (MegaRAID SAS 9260-8i) is only capable to handle 8 arrays within a RAID 10. Because of that I could only use 16 ...
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185 views

RAID 1, mixed size drives?

Hi I have a couple of windows systems that I wanted to install RAID 1 onto, I have purchased PCI express controller cards and extra drives, but here I made a mistake, one PC has an existing 3.5" 160Gb ...
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Areca 1280ml RAID6 volume set failed

Today we hit some kind of worst case scenario and are open to any kind of good ideas. Here is our problem: We are using several dedicated storage servers to host our virtual machines. Before I ...
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3answers
10k views

Is a large RAID-Z array just as bad as a large RAID-5 array?

For a long time I've heard about how bad an idea a large (>5TB?) RAID-5 array is simply because there's a high risk for another drive to fail. Has RAID-Z1 managed to remedy this for an array of any ...
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1answer
4k views

Convert to dynamic disk / option disabled

I'm trying to setup a software RAID-1 at a new hosted server. It has two 3TB disks in and I've installed a fresh copy of Windows Server 2008 R2 Web Edition with SP1 on one of those disks. A step-by-...
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1answer
2k views

Maintain RAID to keep it healthy - data scrub

I want to be prepaired the best to keep my linux sw-raids healthy. So I know it's very important to maintain the data on a RAID to keep it readable in event of disk failure. If not, an URE could ...
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2answers
234 views

Server refuses to boot when Raid5 disk is disconnected - /root/ missing

I recently set up a NAS server running a Debian OS (6.0.4) It contains 4 disks, 3 of them are in a Raid5 array, while the last one is used for the OS. To simulate a disk-failure I unplugged one of ...
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2answers
1k views

Move an existing RAID 5 array from Ubuntu to Gentoo

I have a 64-bit Ubuntu machine with a 4-disk RAID 5 using software raid (md). I've been able to boot an Ubuntu LiveCD and recognize the array with a simple mdadm -A /dev/md0. It was easy to mount ...
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2answers
3k views

How to backup a linux server running a software raid

I would like to backup a production server running ubuntu 10.04 LTS on a software raid. In order to to that I have rebooted into a rescue system which is running in RAM. df -h on ubuntu looks like ...
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2answers
13k views

VMWare ESXi 5 - Expanded RAID 5 array - cannot access datastore

I'm using VMWare ESXi 5 and had a 2 TB RAID 5 setup on an HP DL360 with a P400i RAID card. I added two more 1 TB drives and using the SmartStart ACU, added the drives and expanded the logical disk. ...
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1answer
170 views

Trade reliability for speed in a slow filesystem

On my box running Ubuntu Server 11.10 I have a rather slow soft RAID6 array on four USB sticks (and no other means for persistent storage). I want a faster filesystem on that box. I'm OK if I'd lose ...
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1answer
360 views

Server Config Software Raid Slow Read

I have 6x WD Caviar Black 1,5 TB in Software RAID 10 / 1 / 0 (Centos 6.2 / mdadm) cat /proc/mdstat Personalities : [raid10] [raid0] [raid1] md0 : active raid1 sdf2[5] sda2[0] sdb2[1] sdd2[3] sdc2[2] ...
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375 views

Software RAID setup questions [closed]

I would like to set up a server at home that will have several roles, but the primary and most critical role would be a file server. It will host family photos and videos among other things that I do ...
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How to check CentOS 6 Server VM Host after a power falure?

This afternoon, someone at our office decided to pull the plug out of our server because it was storming outside. They didn't shut it down, they just pulled the plug out while it was running. The ...
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1answer
528 views

Backup Ubuntu server with RAID

I saw similar questions, but this a bit different. Namely, I am trying to make a backup of Ubuntu server with RAID on it. I want to backup complete configuration since that I recently had a problem ...
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2answers
158 views

Fault tolerance RAID card setup

I have been looking at different LSI MegaRAID cards for my undergoing SAN build, and I couldn't find any information about RAID controller redundancy, I have seen number of storage vendors ex, EMC ...
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1answer
968 views

linux dd software raid?

Please advise what is the best way to create linux software raid image with dd? /dev/md0 consists of /dev/sda & /dev/sdb. I ran dd if=/dev/sda of=sda.img same for sdb Restored on the remote ...
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1answer
456 views

RAID iostat showing 0.00 for wait's and %util

I have a EC2 server running ubuntu 11.10 with 6 raid devices, 5 with 8 EBS drives each as part of a RAID 10 setup, the other one with 4 EBS drives as part of a RAID 0 setup. I am finding that even ...
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2answers
470 views

Move HDDs to new hardware

I have a proliant ML150 G6 that has storage controller problems (a Smart Array P410/Zero Memory). It has 2 HDDs in a RAID 1 (or 1+0 I do not remember). I have another proliant DL180 with a similar ...
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1answer
655 views

Cabling order on ProLiant DL180 G5 with SmartArray P800 and 3 x MSA 60 enclosures

For some reason I need to power up a system full of data without having any documentation about cabling. I have : 1x Proliant DL 180 G5 with P800 3x full loaded smart array 60 with probably 2 ...
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Why does RAID5 with an odd number of data disks have poor write performance

According to the comments on my other question, it's more than possible that the reason my MD RAID array is performing poorly is because my RAID5 array has 5 data disks. I've tried searching for ...
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1answer
2k views

prevent filesystem from entering read-only mode

I have found that my server's filesystem is continuously entering read-only mode. There have been some issues with the raid1 array, but I have removed the bad disk from the array. However, it is ...
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2answers
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How to create a bootable redundant Debian system with a 3 or 4 (or more) disk software raid10?

How do I create a Debian system which is bootable, has a software raid10 and will still boot when I take out one or more (bootable) disks? I would like to use as few disks as possible, preferably 3 or ...
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2answers
455 views

How to identify which hdd to be replaced in RAID

Our RAID5 (using Adaptec 3085) stopped working because one of the hdd is broken. How can I identify which one it is?
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1answer
671 views

Windows server 2008 >Raid 5 >How to check disk alignment

I wonder how to check if the alignment is correct in a soft raid 5 configuration of 3 disks/9tb running windows server 2008. Formatting and partitioning was done through the gui but there is no way I ...
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2answers
821 views

What should the total space be for 4 3TB Drives in RAID10 configuration?

I just configured 4 3TB drives in a RAID-10 configuration but the total disk space in the RAID is 4TB. I used the following guide to setup the RAID-10, RAID-10 Intall. Shouldn't the size if the RAID-...
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0answers
451 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
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4answers
12k views

RAID 10 Vs RAID 5 [closed]

I noticed that RAID 5 has been used for a lot of critical application such as SQL server machine. However RAID 10 seems to be a lot more robust. But not much people using it. Any reason why or when ...
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2answers
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LSI 9285-8e and Supermicro SC837E26-RJBOD1 duplicate enclosure ID and slot numbers

I am working with 2 x Supermicro SC837E26-RJBOD1 chassis connected to a single LSI 9285-8e card in a Supermicro 1U host. There are 28 drives in each chassis for a total of 56 drives in 28 RAID1 ...
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1answer
1k views

Estimate the IOPS in RAID 10

According to http://en.wikipedia.org/wiki/IOPS For example SAS disks provide ~200 IOPS each. For RAID 10 consisting of 4 such disks. How much IOPS I could expect for that array? I would think it ...
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1answer
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Why does df shows only half the size of a RAID10 array?

I've created a RAID10 array using 4 75G drives, to create a storage of 150G. After everything finished (including the initial syncing), everything looked good except the output of df -h which showed ...
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3answers
6k views

HP ProLiant ML350 G6 Server

I have a HP ProLiant ML350 G6 Server. I installed windows server 2008 standard edition. There are 60 clients connected to this server. The server only detects one HDD and I have 2 146gb HDDs. I read ...
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1answer
3k views

Change a non-striped LVM LV into a striped LV

I currently have several logical volumes (LVs) on a volume group (VG). This VG is hosted on a single physical volume (PV). I have a spare drive which I can use to shuffle data around on. I also now ...
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Capacity and Failure Tolerance of md RAID10 with n2 f2 layout

The following is qouted from: Intro to Nested Raid Linux md allows you to combine “near” and “far” RAID configurations. For example, in a m=2 and f=2 configuration with four drives (the minimum ...
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3answers
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3WARE 9650-4LPML JBOD DISK to RAID - 1 Mirror Migration How To?

It is possible to migrate a single disk, to Raid 1 as per Table 10 in the User Guide Page 122: http://www.3ware.com/support/UserDocs/3ware9650SE-UsrGuide.pdf I am trying to find what the best method ...
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2answers
943 views

large 20TB+ NTFS volume allocation unit & compression

I am creating backup volume on RAID6 and I want to expand it in the future up to 12 2TB discs. Currently we have 4 discs in RAID5 and 4096 allocation unit + file compression on. Everything is working ...
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2answers
713 views

MegaRAID SAS 8208XLP

I'm just wondering whether anyone knows if I can use a Debian distro with the MegaRAID SAS 8208XLP controller. Currently at the moment LSI only supply drivers/support for RHEL/CentOS but I was ...
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2answers
520 views

Best strategy for setting up LVM over RAID for flexibility down the road?

Alright, I'm hoping that this question is unique enough to not be considered another "What's the difference between LVM and RAID?" questions. Here goes... I'm setting up a linux server which has a ...
2
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1answer
56 views

Consolidating SQL Server

We have a number of SQL Server 2008 R2 standard servers, each for a single application that we'd like to consolidate into one physical server. Running perfmon on these servers they're not using a ...
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1answer
3k views

How to see information about hard drives in Windows Server 2003 using Dell PERC 6/i Integrated RAID Controller

I just found out one of my servers are reporting hard drive error but I'm having problems extracting the information I want. I've downloaded Acronis Drive Monitor so I could see hard drive health and ...