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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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-...
0
votes
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 ...
2
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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 ...
2
votes
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 ...
0
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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 ...
6
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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. ...
0
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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 ...
0
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1answer
357 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] ...
0
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4answers
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 ...
9
votes
2answers
1k views

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 ...
0
votes
1answer
525 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 ...
0
votes
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
958 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 ...
2
votes
1answer
452 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 ...
1
vote
2answers
460 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 ...
0
votes
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 ...
5
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2answers
5k views

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 ...
1
vote
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 ...
1
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2answers
1k views

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 ...
2
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2answers
435 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?
-1
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1answer
667 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 ...
1
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2answers
812 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-...
2
votes
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 ...
0
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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 ...
7
votes
2answers
7k views

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 ...
2
votes
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 ...
9
votes
1answer
1k views

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 ...
1
vote
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 ...
4
votes
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 ...
3
votes
1answer
728 views

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 ...
0
votes
3answers
3k views

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 ...
2
votes
2answers
931 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 ...
0
votes
2answers
708 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 ...
5
votes
2answers
515 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
votes
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 ...
2
votes
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 ...
0
votes
2answers
806 views

Hot swapping a dead drive with hardware raid on linux

I have a server with 4 SATA hot-swappable drives and a 3Ware 9650SE-4LPML hardware RAID controller. The server runs Ubuntu 10.04.3 LTS and I use tw_cli to control the RAID array. So, a disk died and ...
0
votes
2answers
192 views

Will a raid 10 help my db server in terms of trans/sec?

I've been reading about 10k drives being able to run 166 transactions per second vs 250/sec on 15k drives, which in both cases is just the number of rotations per second. What does this really mean ...
4
votes
3answers
11k views

S.M.A.R.T - Predictive Failure Count

I'm monitoring my IBM ServeRAID M5015 controller for RAID status with MegaCLI, I have this on one of the disk : Enclosure Device ID: 252 Slot Number: 6 Enclosure position: 0 Device Id: 14 Sequence ...
1
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1answer
1k views

Best RAID setup for DRBD

I would like to setup a two nodes PROXMOX cluster with DRBD storage. The nodes will be connected by gigabit ethernet. What would be the best storage setup in terms of reliability, performance and ...
0
votes
2answers
356 views

Suggestion on email server with “infinite” disk?

I'm looking to setup an email server which can accommodate hundreds of accounts with "unlimited" email space. I understand that there is no such thing as unlimited but I am under the impression I can ...
3
votes
1answer
190 views

RAID / drive configuration for an intranet MongoDB server

I'm trying to get a handle on the best way to configure a Dell PowerEdge R410 for hosting a MongoDB-backed intranet application. The R410 has 4 drive bays and a PERC 6/i controller. RAID10 is the ...
0
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2answers
938 views

xenserver 5.6 on on raid 10 array

We've always had performance issues with our Xenserver 5.6 and ive asked a question here about it and still didnt manage to get it resolved (http://serverfault.com/questions/231661/xenserver-vms-...
2
votes
3answers
226 views

Local attached storage versus NAS

I currently have 3 old NT File Servers that are about to die, which have no disk level redundancy. We're considering buying drives and attaching them to a newer server that would serve files, but I ...
2
votes
3answers
349 views

8MB/10K RAID5 vs 2x 64MB/7.2K RAID10

I'm looking at replacing an old file server sharing a single RAID5 volume powered by 6 10K rpm disks with 8MB caches. The replacement will be 2 RAID10 volumes of 4 disks each. The new disks have 64MB ...
2
votes
2answers
1k views

How to access to install/check software on a ESXi 5 to view system hardware

I have the following: 2 x DL585 G1 (8 cores) with built in Smart Array 5i (4 x 74GB SCSI in Raid 5) I installed VMware ESXi 5 and got it all working :) When I boot my server up, it states the ...
0
votes
1answer
2k views

Expand PERC 6/i RAID 10 SSD array, or add new VD for SQL Server?

On a Dell R710 server running Window Server 2008 R2 there are currently 4 50GB SSDs in a RAID 10 array, and I'm adding 2 additional 50GB SSDs. This server runs SQL Server and not much else. If these ...
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3answers
2k views

HP DL585 G1 with VMware ESXi 5 - SATA solution, need more storage

I have the following: 2 x DL585 G1 (8 cores) with built in Smart Array 5i (2 x 74GB SCSI in Raid 0) I installed VMware ESXi 5 and got it all working :) However I need more space. I was thinking ...
4
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1answer
2k views

mdadm: hot remove failed for…

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...