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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890 views

Moving RAID 1 disks between servers

I'm replacing a Dell PowerEdge 2950 server (PERC 6/i) with a new PowerEdge R510 (PERC H700). The existing system has its system on a pair disks in RAID1. My intention is to re-use these disks on the ...
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0answers
162 views

Adding SSD boot disk to machine running RAID 10

I have a server (dev rig) that runs Windows 2008 R2 and boots from a RAID 10 setup. Now I want to add an SSD disk that will contain Windows 7 (could be dual boot, but dont plan on salvaging the ...
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2answers
213 views

Poweredge 2850: replace disk with larger in RAID?

Is it possible / rational to replace a failed disk in a PE2850 (win2003) RAID-5 array with a larger size? Im not looking to expand the array - just to replace a failed disk with one that I have in ...
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1answer
252 views

OpenManage vs Reality: where are my disks?

Im getting a 'degraded disk' error from an old PE 2850. I see the orange light blinking on the array so I know where the problem is. The system is running win2003 x64. Im running OpenManage also and ...
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2answers
137 views

PEBKAC failure on Raid 1 array (striped) installation

Some time ago, I attempted to upgrade a RAID 1 array to a RAID 10 array by adding two more disks to the original two that lived in an IBM xSeries 346. In the RAID card's bios, I told it to grow the ...
3
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1answer
190 views

Prior to risky uninstall, pull one disk of raid 1 as a fallback?

I have to deal with a windows 2003 std server that has not been taken care of for years. It has an old, unsupported version of McAfee anti virus enterprise installed on it that is intermittently going ...
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3answers
2k views

How do you mount a RAID1 disk as a normal disk

I'd like to copy data off a disk (EXT2) that's part of a RAID1 mirror (Linux software RAID). When I try to do a manual mount of the disk is complains that it's part of an array. Is there a way to ...
0
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1answer
247 views

Is it possible to add a disk to a RAID5 controller without rebooting? [closed]

I know tw_cli can migrate the RAID5 to an added additional disk, but the capacity will not grow until the machine is rebooted. So is it possible to grow a RAID5 array with no downtime? What is a raid ...
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1answer
755 views

MDADM not able to connect to EBS drives on Ubuntu 11.10

I have been using a raid.sh script [1] for over a year now and has never gave me trouble. I recently started moving from Ubuntu 10.04 machines on AWS to Ubuntu 11.10. I updated the raid.sh script from ...
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3answers
1k views

What would happen if I did a raid on a SSD and an HDD?

I am building another server (cheap) and would like to go with a 256GB SSD drive for my boot and data. This will be enough for my needs, but just having one SSD scares me for a couple of reasons. If ...
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1answer
1k views

What are Linux SCSI command timeouts and is the default suited for software raid?

My understanding of SCSI timeouts is that any read, write, flush and other commands have a limited time to complete. If exceeded, the command is aborted and an error is reported to the upper layer. ...
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2answers
407 views

What is the performance impact of sw RAID in vmware ESXi VM?

There is a part of the infrastructure, where I have to do a sw raid on vmware esxi, because the SmartArray controller cannot be added and connection to the storage is not possible as well. So what I ...
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3answers
1k views

How to use 2 SSD disks for best performace?

I am going to format 2 120GB Intel 320 SSD to be used for a high traffic Drupal server. The server had Xeon E1270 CPU and 32GB RAM. I'm using Debian Squeeze 64 bit. Here are my questions: What ...
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1answer
884 views

Is current SATA 6 gb/s equipment simply unreliable?

I have a 45-disk array of Seagate Barracuda 3 TB ST3000DM001 (yes these are desktop drives I'm aware of that) in a Supermicro sc847 JBOD, connected via LSI 9285. I have found a solution for the ...
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2answers
217 views

Horrible performing RAID

I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a ...
2
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1answer
1k views

dd oflag=direct 5x fast

I have Centos 6.2 in server with this specs: 2xCPU 16 Core AMD Opteron 6282 SE 64GB RAM Raid controller H700 1GB cache NV - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (OS Centos 6.2) sda - 4HD 146GB SAS ...
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1answer
222 views

raid5 configuration on new dell server, sbs, win2008r2

Looking for a bit guidance configuring hardware raid on a new dell t610, I am basically trying to install Hyper-vR2 as the parent OS, then I will run SBS11 and WIin2008R2 virtually on top of that. ...
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2answers
2k views

Monitor LSI 3ware raid controller on ESXi

This concerns a server that runs ESXi (v. 4.x or 5.x) installed on drives that are configured into a raid10 using an LSI 3ware 97050 raid controller. I would like to know if there is a way to monitor ...
0
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2answers
226 views

Suggestions for splitting server roles amongst Hyper-V virtual servers / RAID6 or RAID10? / AppAssure

We have 2 Hyper-V hosts at present running 1 virtual server that was converted from a physical box running all roles. My plan is to split the roles over various virtual machines, upgrading to the ...
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4answers
1k views

No partition found error when installing an OS on Dell Poweredge with RAID

I have three Dell 1850 rack servers: One has 3 GB of RAM and two 73GB HDD's. Two others have 6 GB RAM and each of them has two 73GB HDD's. I am currently trying to install an OS on them, but when ...
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3answers
1k views

Raid-5 Performance per spindle scaling

So I am stuck in a corner, I have a storage project that is limited to 24 spindles, and requires heavy random Write (the corresponding read side is purely sequential). Needs every bit of space on my ...
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1answer
289 views

What is the meaning of the 'Personalities' feature under /proc/mdstat

On some systems I see this : Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] md1 : active raid1 sdb1[1] sda1[0] 10485696 blocks [2/2] [UU] md2 : ...
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0answers
651 views

Slow disk transfer rate

I have problem with slow disk transfer rate. It's static files server for our website. I was making backup of data and noticed that tar is very slow. So I did hdparm -t and... hdparm -t /dev/sda3 ...
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2answers
2k views

HP P212 hangs on Initializing

I'm in trouble... Server: HP Microserver N36L Storage: HP P212/256 with BBWC Drives: 4 WD 2 Tb While expanding the RAID 5 array from 3 to 4 drives, the server rebooted itself. Expansion was at 76%. ...
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1answer
136 views

Raid 1 / Raid 10 - Disk Failure

I have setup Software Raid 1 and Raid 10 using VirtualBox for testing purpose. The partition and raid setup look like this: When I deliberately remove Disk2 and restart a server, it booted to OS ...
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1answer
1k views

Raid 1/10: Kernel panic- not syncing: attempted to kill init

I have setup Raid 1 & Raid 10 in Virtual Box for learning purpose. The following Partitions for 4 Hard Drives: I make a 100mb partition (/boot) on four drives and make that a raid 1 partition. ...
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1answer
247 views

enabling write cache on existing RAID arrays

I have an Adaptec 3805 RAID controller and with two arrays without write cache. Now that I have bought the battery module for this controller, can I now enable the write cache on the existing arrays? ...
2
votes
1answer
703 views

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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1answer
2k views

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 ...
2
votes
2answers
104 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
993 views

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. ...
2
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2answers
984 views

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 ...
2
votes
2answers
501 views

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 ...
0
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3answers
268 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 ...
0
votes
1answer
252 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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1answer
697 views

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 ...
2
votes
2answers
8k 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 ...
3
votes
1answer
784 views

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 ...
0
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2answers
131 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 ...
9
votes
2answers
858 views

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 ...
4
votes
3answers
4k 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
1k 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 ...
0
votes
1answer
714 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
223 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 ...
2
votes
2answers
873 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
2k 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
8k 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. ...
0
votes
1answer
160 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 ...
0
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1answer
258 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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4answers
322 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 ...