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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2
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2answers
88 views

erased md0, md1 and can't recreate them

I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1. I need to set them up again. When ...
1
vote
1answer
4k views

DELL Server RAID Exception - Resyncing

Today they brought this old DELL server with 2 HDD initialized in RAID 1 Array. The server was used as a syslog aggregator for a long time and I was tasked to to some maintenance before we return the ...
1
vote
3answers
1k views

IBM SR-BR10i RAID Controller too slow with VMware ESXi

I'm transferring a virtual machine from one ESXi host to another using SSH on both ESXi Servers. But it's painful slow, it's a massive 750GB .vmdk disk image, the VM is stopped (with downtime) and ...
-1
votes
3answers
108 views

Two drives, how can i max reliability and uptime? [closed]

I have an asterisk pbx. It has 2 drives in a raid 1 setup. However if my main drive fails my 2nd won't boot, as it has no boot partition. The most important thing for me is up time. If there is a ...
0
votes
1answer
4k views

Fixing a failed grub upgrade on RAID

We just upgraded out dedicated server from Debian Lenny (5.0) to Debian Squeeze (6.0). In the process, the grub upgrade failed. I (perhaps foolishly) followed the advice at ...
5
votes
1answer
2k views

HP Proliant ML350 G5 SAS HDD

I am getting problem in HP Proliant ML350 G5. Some few days back one of the SAS HDD failed. It was 146GB SAS 15krpm HDD. We got new one which is 146GB SAS 10k rpm HDD. Its on RAID 1(1+0) ...
1
vote
1answer
149 views

Speed up RAID 1 drive read speeds

Sorry I don't know much about this stuff...we have been having issues with a slow server, very slow for users and when you access the server direct, we have added more RAM but it seems it may be a ...
0
votes
2answers
415 views

HDD in RAID failure?

I received some alerts from mdadm. Further checking seem to indicate that some HDD's may be damaged. Could you please verify that? There is two SCSI drives which should work in RAID1 This is an ...
3
votes
2answers
3k views

HP P410 ADU (hpacucli) generates empty report

I'm trying to monitor hard drive's smart status. I've tried smartctl tools and HP's own hpacucli to generate ADU report. However, neither of them are useful. smartctl does not show values like Power ...
26
votes
5answers
6k views

Do I need to RAID Fusion-io cards?

Can I run reliably with a single Fusion-io card installed in a server, or do I need to deploy two cards in a software RAID setup? Fusion-io isn't very clear (almost misleading) on the topic when ...
3
votes
1answer
191 views

zfs with unsymmetric vdevs

let's assume that i have a raidz created from three disks (or vdevs). $ fallocate -l 64m /tmp/one $ fallocate -l 64m /tmp/two $ fallocate -l 64m /tmp/three $ sudo zpool create test raidz /tmp/one ...
3
votes
2answers
6k views

Using software-RAID vs “firmware”-RAID (a.k.a. FakeRAID) [closed]

We recently bought a tower server on which I want to install Debian. I thought the device had hardware RAID, as I could see a BIOS screen. As it turns out, it's still a software RAID. When I configure ...
3
votes
1answer
2k views

Recover mdadm RAID 10 array: listing all as spares

I'm a bad person and haven't backed up my RAID elsewhere. I now have a RAID10 array that won't assemble, and I'm hopeful I can save it. Here's the details: I have five hard drives set up as RAID10 ...
4
votes
1answer
2k views

Linux RAID mdadm: what does 'Events' mean?

When I type mdadm --detail /dev/md0 I get a lots of useful information most of which I understand. However I also get a line that reads: Events : 0.710 Where the number varies. Naively, I ...
0
votes
1answer
45 views

How do you get into the interface on a ProLiant DL 366 G7 and set RAID? (Smart Array 410 P)

How do you get into the interface on a ProLiant DL 366 G7 and set RAID? Into the Smart Array P410 controller?
2
votes
1answer
3k views

Linux RAID5 Optimal Chunk Size

I bring up, yet again, the ever-present question of how to best optimize disk structures. In my organization, we have a 14TB Linux software RAID array dedicated to storing backups made using Symantec ...
-2
votes
1answer
60 views

Preparing for RAID5 failure [closed]

I've got an Ubuntu system with a bunch of hard disks in it acting as my home router, DHCP server, file server, etc. Twice in the past 24 hours it has suddenly decided to set the root filesystem to ...
0
votes
3answers
255 views

RAID 5 with two failed devices

I have a software RAID 5 with 6 devices and one of them needs to be rebuilt. Until now, everything is OK. But, while the disk is rebuilt, it was found bad sectors on another disk and is being marked ...
1
vote
2answers
1k views

Intel RAID Web Console 2 and ESXi 5

I have two ESXi servers with Intel SRCSASBB8I RAID controller. When those server have installed ESXi 4.1 I was able to manage RAID configuration of those server using Intel RAID Web Console 2 running ...
1
vote
2answers
877 views

RAID controller won't rebuild RAID-1 array

I have a RAID-1 array on a desktop computer. The RAID controller is a 3ware 7006-2. Recently the controller has been reporting ECC errors from one of the drives. It was able to correct all of those ...
2
votes
2answers
216 views

Why it is dangerous to turn off storage arrays even in extreme cases?

I have read in a couple of places that when you are in the situation in which there are no spare disks and the RAID level doesn't protect you from another disk failure, some administrators choose to ...
1
vote
1answer
223 views

Using hpacucli to disable auto logical volume disabling when failed

By default, when a physical drive fails in an HP RAID array, the controller takes the logical volume offline to prevent data loss, instead of taking it in "degraded" status like LSI/Adaptec does and ...
0
votes
2answers
170 views

Is there redundancy during a RAID build?

We're building an array of 12x 2TB drives in a RAID60 array using an Adaptec hardware card. It's taking a long time to build/verify, and performance is slow. We've worked out that it will be around ...
2
votes
1answer
72 views

Benchmark individual drives in RAID5

I'm running a server with 3 RAID5 arrays through an ARECA 1880i coupled with a HP-SAS Expander. After experiencing a massive degradation in performance lately, I want to benchmark the drives ...
0
votes
1answer
321 views

RAID 5 - DELL 2850 and others

I have installed Ubuntu on a DELL 2850 and I have configured an array of 5 disks (SCSI 73GB 10K) in RAID5. I wanted to simulate a drive error so in the middle of something I just took one of the ...
4
votes
4answers
5k views

How to create Raid 10 with megacli

I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in ...
3
votes
4answers
14k views

Software RAID underneath ESXi datastore

I'm building an virtual environment for a small business. It is based around a single ESXi 5.1 host, which will host half a dozen or so VMs. I'm having some doubts regarding how to implement the ...
1
vote
2answers
891 views

Cannot create zpool, how to get rid of intel raid volume?

This is a FreeBSD 9.1 amd64 computer. It has 5 disks installed. The ada0 and ada1 disks are used with a hw raid to provide the root filesystem: root@gw:/home/gandalf # ls /dev | grep ada ada0 ada1 ...
0
votes
2answers
5k views

data lost with RAID5 on proliant DL360 when drives fail

For some reason the Array Controller on my Proliant DL360 G6 couldn't recognize 2 of the 6 750GB drives I am running in a RAID 5 configuration with VMware ESXi 5.1. When I rebooted the server I chose ...
2
votes
1answer
702 views

How to grow mdadm RAID5 into degraded state?

mdadm - v3.2.5 - 18th May 2012 Currently have: Version : 1.2 Creation Time : Tue Jun 25 19:03:31 2013 Raid Level : raid5 Array Size : 2930135040 (2794.39 GiB 3000.46 GB) Used ...
0
votes
2answers
3k views

ESXi local storage recommendation

We are going to buy HP Proliant Server DL380p Gen8, and we want to run vmware esxi 5.1. but I have problem with choosing the correct storage with the lack of budget. we have choice to buy 4x2TB SATA ...
0
votes
1answer
685 views

Is there a way to obtain a Dell server's RAID configuration/level using only winrm/wsman? (ESXi servers)

I've seen videos describing how to configure RAID using wsman/winrm commands run against a server's iDRAC, but I can't seem to find anything that will just give me the current configuration and RAID ...
1
vote
1answer
689 views

PowerEdge 2900. Want to use as a SAS wiping server, and skip Raid configuration for each drive. Possible?

I've got a Dell PowerEdge 2900 with 8 SAS slots in the front. I want to be able to load drives quickly without setting them up in RAID. We have a pile of about 50 SAS drives that need to be wiped. Is ...
0
votes
2answers
4k views

Adding foreign disk to Dell Poweredge 2950

I have 4 300G disks in a RAID5 configuration on a Dell Poweredge 2950 with PERC 5/i. I'm trying to replace one of the disks (it failed) with a disk from another identical server. I got a warning that ...
2
votes
2answers
103 views

Progressive upgrade of a RAID array

I have a 16 disk backup RAID6 array. Currently, those 16 disks have the following specs; 500 GB 16 and 64MB cache 3 Gb/s SATA I would like to begin upgrading these disks if possible, primarily ...
1
vote
1answer
9k views

What Block Sizes and Stripe Sizes will cause performance issues using RAID5?

I'm trying to understand Block Size and Stripe Size. I realize this could apply to more configurations than just RAID5, but i am interested in RAID5 specifically, because I'd like to understand the ...
-4
votes
1answer
2k views

job interview - technical questions (hardware / network) [closed]

i recently had a phone interview, and did not get the job. i'm curious if i didn't get the technical questions correct, or whether there was something else about my interview that caused me to not get ...
4
votes
2answers
417 views

Where ZFS configuration is saved?

I have a simple setup: Ubuntu 13.04 on internal USB thumbdrive 4xSATA drive in raidz spool with some volumes /tank/vol1, /tank/vol2 Where does zfs store its' configuration data - is it on ...
0
votes
1answer
574 views

Freebsd 8.1 Samba4 smbclient returns NT_STATUS_INVALID_PARAMETER

I'd like to setting up a NAS server and run Samba4 on it. When I'm runing this command: # smbclient -I 192.168.48.128 -L NAS_GROUP Enter root's password: Connection to 192.168.48.128 failed (Error ...
3
votes
1answer
366 views

Performance of Linux software raid-1 across SSD and HDD (partitions)

How does Linux software raid-1 work across disks of dissimilar performance. Would a raid-1 across ssd and hdd partitions give me a mirror of the ssd contents while not impacting the read speed? I ...
5
votes
1answer
333 views

RAID Recovery after Firmware issue

This may be a duplicate but I think the situation is different. We were having problems with a HP MSA2000 SAN, speaking to support they suggested that we upgraded the firmware to the latest version ...
3
votes
2answers
310 views

RAID 1E with ZFS

IBM's storage systems as well as Linux' mdraid do support RAID level 1E to be able to use an odd number of disks for a 50% redundancy: Would I achieve the same effect creating a zpool with an odd ...
-4
votes
1answer
55 views

installing three operating systems on mirrored volume [closed]

I have 2 mirrored hard disks in my server(ASUS TS500-e4). Then I have created 3 partitions on mirrored volume and installed 2003 server on 1st partition and 2008 R2 on 2nd partition. Then I tried to ...
0
votes
2answers
465 views

Dell PowerEdge 1950 Drive Bay not showing in SAS Configuration Utility

We have a Dell PowerEdge 1950 in RAID 1. Recently, the drive in Bay 0 began rapidly blinking green (I'm guessing twice per second, indicating "identifying drive"). When I open the SAS ...
1
vote
2answers
1k views

Can't build RocketRaid rr268x on Ubuntu 13.04

I am trying to build the kernel module for Ubuntu 13.04 but not having any luck, I have had this card working perfectly fine with 12.10 and the 3.5.0-27-generic kernel but since upgrading to 13.04 ...
0
votes
2answers
3k views

Software for RAID Failure Alerts?

I have two 256 GB Samsung 840 Pro SSD disks in a RAID 1 array. I would like to receive a notification if one of the disks in the array fails. Can anybody recommend an application I can install on the ...
0
votes
1answer
102 views

RAID5 Bad Superblock, not booting to OS

I've been running Ubuntu 12.04 LTS for about 6 months on a computer that has 3 180gb SSDs in EXT4 RAID5 configured through the motherboard's BIOS. The OS froze and computer had to be forced down. On ...
4
votes
2answers
445 views

Why is domU faster than dom0 on IO?

I have installed debian 7 on a physical machine. This is the configuration of the machine: 3 hard drives using RAID 5 Strip element size: 1M Read policy: Adaptive read ahead Write policy: Write ...
-5
votes
2answers
798 views

P812 “forgot” RAID6 - can't see disks at boot time in ORCA

We have an MSA60 with 12x4TB non-HP issue Seagate Constellation ES.3 drives connected to a P812/FBWC, on which I created a RAID6 over all of those disks with hpacucli and started to copy data on them. ...
0
votes
1answer
1k views

Which alternative is most performant (raid, ssd, 15k rpm disks)

I'm looking at the DELL PowerEdge™ R720 from Hetzner. This server has a Dell PERC H710 8 Port SAS/SATA 6GBit/s raid controller. I have the choice between: 3 x 600GB SSD (MLC SATA 3Gb/sec) 6 x ...