RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.
Questions tagged [raid]
3655 questions
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Ubuntu Software RAID 0 on AWS Does Not Survive Reboot
I'm experimenting with creating a software RAID 0 device from 4 EBS volumes on Ubuntu 9.10 running at Amazon AWS following this guide:
http://alestic.com/2009/06/ec2-ebs-raid
The device appears (and according to SysBench is 3.5x faster than a…
Eric J.
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LVM, Soft RAID1, and Replication?
I am practicing putting together a HA file server. It is a linux server with 2 1.5TB Hard drives. My plan is to use LVM to manage the physical volumes into logical volumes for /, /home, and /var. Then use md (soft RAID 1) to mirror the image onto…
mtkoan
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Software RAID 10 on Linux
For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm…
vpetersson
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Experience with AMCC 3ware 9650se raid cards? Ours seems dead
We have a 8-port 3ware 9650se raid card for our main disk array. We had to bring the server down for a pending power outage, and when we turned the machine back on, the raid card never started.
This card has been in service for a couple years…
antiduh
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What is the SCSI RAID channels?
What is the SCSI RAID channels? I.e. what is the difference between, say, 1-channel RAID controller and 2-channel RAID controller?
Is it for data throughput, number of RAID arrays I can create on controller, number of disks I can plug into…
timurb
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perf tuning for ESX vmfs3 on RAID
looking for recommendations on ESX4 OS - VMFS version3:
RAID-5 : matching the stripe size with VMFS block size? (64K, 128K etc)
RAID controller options: "adaptive read ahead, write-back" on PERC 6i
i have read that smaller stipes are good for writes…
JMS77
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What is the best way to check my RAID HDDs from windows?
I have a file server (2003) and I want to be able to check if the HDDs are good or not. They've been running for over 3 years.
AppsByAaron
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HP DL185 - very slow disk read speed
I have a HP DL185 G6 Server (12 disk model) with the following spec:
Quad Core Xeon 2.27GHz
6GB RAM
HP P212 RAID controller with battery backup
2 x 128GB 15K SAS 3.5" (RAID-1 for the operating system)
4 x 750GB 7.5K SAS 3.5" (RAID-5 for the data,…
fistameeny
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How to configure SCSI hard drives and RAID for Poweredge 2850 web server
I'm trying to set up a Poweredge 2850 as a web server, but as a server novice it's causing me some confusion.
Its a virgin install so no data to be lost as yet, so I'd like to get the best arrangement for setting up Windows Server 2008. The box will…
Saul
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Reconfigure RAID on Dell PowerEdge T710
I have a Dell PowerEdge T710 under my feet at this very moment, with RedHat Enterprise Server 5.3.
I have 6 1TB disks and two 500GB. parted reports two devices, one 500 GB and the other 4 TB. So I assume the RAID has been setup as mirror for two…
Stefano Borini
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mdadm auto grow raid
I have a raid0/1 on lvm logical volumes.
I resized the logical volumes.
Now I want to resize the raid to use the complete logical volumes.
This can be done with
mdadm /dev/md? --grow -z newsize
When I do only
mdadm /dev/md? --grow
I get mdadm: no…
johannes
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Optimal disk partitions for database setup (15 Drives)
We are setting up a new database system and have 15 drives to play with (+2 on-board for the OS).
With a total of 15 drives would it be better to setup all 14 as one RAID-10 block (+1 hot spare) OR split into two RAID-10 sets one for Data (8 disks)…
telstone
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20 1TB drives vs. 10 2TB drives in RAID5/6 server
I will be setting up a server at work and I need some advice on some details. The setup will be one blade-type server (8-core, 16GB RAM) with two subsystems - one for the main storage the other to back it up. I'm shooting for a 20TB array (I know…
Hunter
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1 answer
Software Based RAID? Via OS or Controller?
So, I just discovered that the RAID controller within my Dell Precision 470 is software based. I never recognized until now that Adaptec CERC stood for "Cost Effective Raid Controller"... amazing.
According to this lovely Dell datasheet, it appears…
BSchlinker
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Very slow harddisk performance
Today I was trying to execute a long-running (but highly optimized) query on a server in our company. I've run the same query on the same data on my home computer (5400rpm harddisk) and it took about 40min. The server is about 10 times slower, maybe…
Wikser
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