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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“Verifying DMI Pool” hang caused by raid array

I have a problem, I obtained a new server with 4 hard drives (2 500 gig, 2 two TB), and an adeptec RAID card. I arranged them in two arrays with RAID 1 (500 gigs together as primary and the 2 TB ...
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2k views

Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?

On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on ...
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2answers
478 views

Proliant ML350 G3 System board failure

My ProLiant ML350 G3 Tower server's system board has gone bad after it had an inch of its lower edge in rain water. I have a SCSI controller Smart Array 532 with six (36GBx3 and 146GBx3) under RAID5 ...
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356 views

My server was used to boot (problem after MDADM raid rebuild)

My home-backup server, with 8*2TB disks won't boot anymore. Two disks failed at the same time and i rebuilt the raid 6 array with no problem, but now i can't boot the os. I'm using ubuntu server, ...
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1answer
162 views

Switching from Raid1 to Raid10

we are running a Dell Server with a PERC5i Raid card using a Raid1 setup. Now we are hitting a performance problem with our harddrive performance and think about switching to Raid10. Which steps are ...
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1k views

How do I replace a drive on my NAS?

I have a Thecus N8800+ NAS. It has 8 2TB drives and is RAID 6. One of the drives recently has been reported as having bad blocks, though the RAID is still reported as healthy. I want to replace the ...
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565 views

How hazardaous is leaving IBM RAID in bad stripes mode?

One of disks in our RAID 1 configuration gone bad, and caused the whole logical disk to become in bad stripes mode. We replaced the bad disk with a new one and complete the rebuild, but the logical ...
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Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux?

We use RAID1+0 with md on Linux (currently 2.6.37) to create an md device, then use LVM to provide volume management on top of the device, and then use ext4 as our filesystem on the LVM volume groups. ...
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353 views

Replicated filesystem and EC2 MySQL

I'm currently investigating migrating our infrastructure over to run on Amazon's EC2 and am trying to figure out the best way to set up a MySQL service. I'm leaning towards running our own MySQL ...
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506 views

RAID of SATA SSDs or PCIe Flash?

As a reference: Crucial RealSSD C300 256GB drives. MySQL 5.1.5x running InnoDB tables. Linux (CentOS 5.5 etx3 journaled). Questions: Is it better to use a RAID of these so that drives can be ...
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130 views

How important is the HCL for disks for RAID cards?

I'm looking to get a Highpoint Rocketraid 3560 from newegg and attach 10 2TB drives to it. However, on the HCL of the 3560 on Highpoint's web site, it lists exact models of HD's that are compatible ...
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What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?

Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power ...
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2answers
330 views

Need help with MS SQL SAN disk array provisioning

We have a HP MSA70 with 20x300gb 2,5" 10k disks allocated for our SQL2008 server. Our usage of the SQL server is: 50 concurrent users of our ERP system(Visma business) - 70/30 read/write. 2500 ...
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2answers
442 views

DELL PowerEdge 2850 - How to change PEDC 4e/Di from RAID-0 to Raid-1?

SERVER : PE 2850 RC: PEDC 4e/Di Raid Config: Raid-0 (Current) Disk: 2 X 300GB I have very little in this server space, Recently I got a server PE 2850 and trying to change the RAID configuration ...
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53 views

HDD partition corrupting

I manage a server for a nursing home. The system is running 3 x 320GB SAS drives in a RAID5 array. This is split into 6 partitions. The partition which stores all the users profiles becomes corrupt ...
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2k views

RAID Configuration

Is it possible with the HP Smart Array P410i to create 4 arrays from 6 disks in the following way: 2 of them in a RAID 10 4 of them used as single disks
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2answers
457 views

Synology NAS server for home network? [closed]

I am considering a Synology DS1511+ for my a development network. I was going down the Drobo Pro FS road until I discovered that their performance is fairly weak. This is sad because a friend of mine ...
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2answers
423 views

Is RAID0 inside a virtual machine faster?

Has anyone experimented with running a virtual RAID0 inside a VM? For example, two virtual disks in a software RAID0 configuration, rather than a single virtual disk. Specifically, I'm wondering if ...
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1answer
83 views

Are zero channel SAS RAID controllers using proprietary protocols?

I have SuperMicro server with a dead zero channel SAS raid card, that is the motherboard has two 36 pin multilane SAS connectors. What I can't figure out is: Can I just buy say an IBM ServeRAID 8X ...
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4answers
450 views

mdadm: Replacing array with entirely new drives

I have a server with three 500GB drives, with most of my data in a RAID5 configuration spanning the three of them. I just purchased and installed four 1TB drives, and the intention is to move off of ...
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2answers
486 views

How to identify RAID (5 or 6) controllers that allow dynamic resize of the array

I'm building a server with a RAID5 array, based on a hardware controller. I want to be able to later add additional disks and have the array rebalance across all of the disks, enlarging the usable ...
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2answers
691 views

RAID Manager on Windows for IBM Server x-345

Good Morning, I have a IBM x-series 345 server with Windows Server 2003, I have a defunct drive which I would like to replace and rebuild the RAID while the server is up. I have been up and down in ...
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42 views

Expanding an existing data server

I have two storage servers available, both with an Areca ARC-1680-ix-8. It has an external SAS port available. As I'm kind of new to this, do I just link both using the external SAS, after which they ...
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LVM vs RAID0 vs RAID “linear” - Combine 2 disks as one, data recovery?

given two 2TB USB external disks that have to be combined to one 4TB volume and formatted with one big Filesystem (XFS), I have a small question to ask. Does LVM provide better Data recovery, should ...
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233 views

RAID1 setting in S5520HCR

How do you set up RAID1 in the BIOS of an Intel S5520HCR server motherboard? When I try to create a RAID1 array, I cannot install Windows Server 2008. The error it gives me is Installation path was ...
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How to check if my hard-drive are on RAID5 or RAID6? - Windows Server

I'm not sure if a server I own has been setup on RAID or not. Is there any way to check this within Windows, rather than relying on what the company support tells me? Any ideas? :)
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4answers
693 views

Can someone explain the physical architecture of RAID 10 in complete layman's terms? [duplicate]

I am a newbie in the world of storage and I am having a hard time digesting the physical architecture of some of the RAID levels. I am particularly interested in RAID 10, and 50. I asked the question ...
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145 views

backup storage server

Is it possible to have a machine (used for storage) with the following: Lets say all the HDD's are 73GB SATA drives. 1 HDD for the OS. 2 HDD for the storage (RAID 5, hardware) 1 Hotswap HDD which ...
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3answers
1k views

Four disks - RAID 10 or two mirrored pairs?

I have this discussion with developers quite often. The context is an application running in Linux that has a medium amount of disk I/O. The servers are HP ProLiant DL3x0 G6 with four disks of equal ...
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2answers
491 views

Will Software RAID And iSCSI Work For A SAN

I am looking for a SAN solution, but can't afford even entry level solutions. Basically, the SAN is for development and a proof of concept product. The performance doesn't have to be amazing, but ...
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842 views

Adaptec RAID 5 degraded but all HDD are reported as optimal

According to adaptec support site, data on a disk got corrupted. The disk is physically fine and thats why it shows up as optimal. The solution is to reinitialize the disk. The only problem is I can't ...
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2answers
545 views

Is data=journal on a separate device on Ext4 as good as using a RAID controller with battery backed cache for file system consistency?

It seems to me that data=journal prevents file system inconsistency in the case of power failure. Using it with a dedicated journal device mitigates the performance penalty of writing the data twice. ...
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410 views

Advantages of multiple SQL Server files with a single RAID array

Originally posted on stack overflow, but re-worded. Imagine the scenario : For a database I have RAID arrays R: (MDF) T: (transaction log) and of course shared transparent usage of X: (tempDB). I've ...
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1answer
340 views

Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely ...
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2answers
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Rebuilding LVM after RAID recovery

I have 4 disks RAID-5ed to create md0, and another 4 disks RAID-5ed to create md1. These are then combined via LVM to create one partition. There was a power outage while I was gone, and when I got ...
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5answers
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What is better LVM on RAID or RAID on LVM?

I currently have LVM on software RAID, but I'd like to ask you what you think it is better solution, maybe some pros and cons? Edit: It is about software raid on lvm or lvm on software raid. I know ...
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3answers
735 views

Installing grub2 on ubuntu with software raid mirroring

Can someone help me out on this? I accidentally installed grub on usb flash drive during ubuntu server installation. Now I cant boot system without drive attached to server. I want to install grub on ...
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1answer
113 views

Does the IBM Xseries 305 Server Support Raid Arrays?

I'm wondering if the Xseries 305 server supports raid arrays? If so, is there already a chip installed for it?
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196 views

Upgrading NAS hard drives

I was thinking of buying a NAS for home-usage. I've never used a NAS or had HDDs set up in Raids. Before I commit myself to moving all my data to a NAS I need to find out how difficult it is to ...
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6answers
39k views

How to interrupt software raid resync?

I want to interrupt a running resync operation on a debian squeeze software raid. (This is the regular scheduled compare resync. The raid array is still clean in such a case. Do not confuse this with ...
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3answers
593 views

Would unplugging a drive simulate a drive failure?

I just set up a RAID 1 array, 2 2tb drives mirrored. I am wondering what will happen if one were to fail. Would unplugging one of them be a valid test? I am using the Onboard controller of an asus ...
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4answers
1k views

Linux Raid: Can mdadm --grow a raid1 while mounted?

I have 2 500gb drives in a RAID1 setup that I needed to upgrade for more space. I mdadm --fail'ed each drive in turn and I used dd to copy each drive to it's respective larger drive (2tb each), ...
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3answers
928 views

Drobo-like linux file server - how do I do it?

I've been pondering for a long time about how I can set up a server which operates much like the Drobo storage thing. The reasons I don't actually want a drobo is because I've heard scare stories, ...
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2k views

How to disable automatic and forced fsck on disks in a linux software raid?

This is the /etc/fstab entry of a raid system /dev/md4 that is controlled with mdadm and webmin on an ubuntu 10.04 64 server: /dev/md4 /mnt/md4 ext3 ...
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640 views

Software RAID vs Hardware RAID

I need more info about RAID. I have a 1U server from Dell R210 with an onboard RAID controller, which I am not able to get to work with Ubuntu install, so I setup a software RAID on Ubuntu. My ...
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243 views

Re-assembling the RAID-5 array reboots my CentOS-5 machine

I have 3 HDD's, each divided into 3 partitions. I had created a RAID-1 for boot partition md0 created from sda0, sdb0 and had also created two RAID-5 arrays: md1 created from sda1, sdb1, sdc1 ...
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5answers
9k views

Dell Server Running Vmware. How do I know when mirrored RAID fails?

I have a Dell PowerEdge T710 w/ an integrated PERC H700 RAID controller. I am running two 500 gig hard drives off the machine in a mirrored raid. The entire machine is running VMWare ESXI 4 and I ...
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1answer
1k views

RAID P410i and P812 performance issues [closed]

I'm having much trouble with I/O performance of HP DL360 server with two RAID controllers - P410i and P812, Windows Server 2008, 36 GiB RAM and 16 x Intel Xeon x5550. The server runs a bunch of tasks ...
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5answers
545 views

RAID Monitoring

Is there any open source Dell H/w base RAID monitoring tool? Or any tool which monitors the hdd disks failure in RAID or power supply failure on Dell PE servers.
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How many RAID “Channels” are on the PERC H700?

How many RAID "Channels" are on the PERC H700? 2? How would I verify which RAID is on which channel, and can I move them from one channel to another to balance the load per channel better?