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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SBS 2003 boot stalls at acpitabl.dat

I have a SBS 2003 server running for 3 year without any problems, and few days ago it freezes during the boot. System is using two 500 Gb drives in RAID1 (Intel Matrix 7.5) After trying to load in ...
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1answer
2k views

LSI MegaRAID - Recreate missing RAID 1 array

I have an LSI MegaRAID SAS 9260-4i Controller with two drives attached to it with a simple RAID1 array (virtual drive). One of the disks failed (complete disappeared from the system) so I asked the ...
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0answers
20 views

rebuild with SSD drivers with megaraid in a twin server

I had a twin server with 12 300GB disks. There were 6 300GB disks for the master server and 6 300GB disks for the slave server with megaraid raid 1. I was to replaced them all with 512GB SSD drivers. ...
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3answers
793 views

Are there different kinds of Mini SAS to 4x SATA reverse breakout cables?

I have an RPC-4224 case that has 24 bays with 6 Mini SAS ports. I needed a cable to break out one of them into 4 SATA ports, so I went down to my local Fry's Electronics and bought one. The cable came ...
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1answer
33 views

BTRFS new device cannot be added

I have a raid10 setup with btrfs with 5 disk currently: Total devices 5 FS bytes used 6.89TiB devid 1 size 3.64TiB used 2.83TiB path /dev/sde devid 2 size 3.64TiB used 2.83TiB path /dev/sdd ...
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3answers
47 views

RAID versus Storage Pools

I'm currently developing a requirements specification for a new server and am trying to weigh benefits & pitfalls with available technologies. Our current server uses a RAID-5 disc layout which ...
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1answer
1k views

Resize openSUSE 12.3 GPT ext4 partitions in a RAID1 disk array

I have a software raid configured (/dev/md2) which has assigned the partitions sda3 and sdb3 from two 3TB disks (sda and sdb). The partition types are GPT not LVM and file system is ext4. Now, the ...
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1answer
23 views

Intel RAID controller cannot open BIOS and doesn't recognize hard drives

I recently bought a second-hand Intel RAID controller (SRCSASLS4I) for my Ubuntu server setup (YunoHost actually). I connected 3 hard drives that had previously been used for a software RAID (I did ...
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1answer
2k views

IBM ServerRaid lost Raid-5 configuration

I have an IBM server x3400 with 8 drives divided into two arrays. After reboot, ServerRaid lost the configuration of the Raid-5 array. The 6 drives that used to be part of this array are there, but it ...
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126 views

Design of hard drive RAIDs [closed]

My task is to reconfigure a main server that houses the company's applications and data. The server is capable of handling everything. I wanted to find out if anyone has a suggestion on the best ...
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1answer
21 views

RAID 5 - disk rebuild and strip data

we have a raid 5 with 12 ssds plus 2 spares and one came to fail, now one of two of spares is active and a rebuild is happening: in raid 5 data is striped in all disks or it is stored in each disk ...
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2answers
2k views

RAID6 setup - adding additional drives

I want to setup a dedicated server. To begin with we need a minimum of 8TB. I believe I can begin with 6x2TB drives in a RAID6 setup to achieve this. Now when I need to increase this capacity to ...
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1answer
32 views

How to configure Array on DL360 GEN 8 Server Running Ubuntu

Hi all I have an DL360 GEN 8 Machine. And I need to install ubuntu server on it. However. Accourding to HP, THE Dyanamic Smart Array System is not support. Since I would love to make use of array.. ...
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2answers
53 views

Is there really any need to use a RAID with SSDs ? [closed]

It seems that SSDs inherently address things that RAID arrays were made to solve - Seek time is 0 ; Lifespan is much longer / health reporting is better / data recovery is generally easier. Plus, ...
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0answers
18 views

HP MSA P2000 G3 Disk Scrubbing performance?

I have a HP P2000 G3 array with two 10Gbit iSCSI controllers in it that presents storage to my virtualisation cluster. It is soon to be expanded with two D2700 shelves each loaded with 25 10k RPM ...
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3answers
3k views

Dell Open Manage physical disk failure predicted

I've installed the Open Manage Server Administrator on my Dell T100 to monitor RAID Controller and disks. From the Physical Controller report web page I see a table listing the two disks I have but ...
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2answers
473 views

(Soft) RAID 6 on Ubuntu 7.10, should I migrate to 8.10?

My System is a Ubuntu 7.10. I have a (soft) RAID 6 with 5 disks (Samsung 500GB SATA disks), formatted with jfs. Should I upgrade to 8.10 or isn't it worth the hassle? What are the chances that ...
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1answer
19 views

Perc H700 disk rebuild keeps going offline

I have a Dell Poweredge R710 with a Perc H700 Raid controller. It's in a RAID 6 configuration currently with 2 failed disks. It does boot to CentOS in it's currently degraded state. I would like to ...
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2answers
270 views

4TB drives using an ARC-1231 controller?

I would like to install 12 4TB hard drives in a RAID array using an old Areca ARC-1231 controller. Are 4TB disks supported by this controller? I could not find the specs for this controller at their ...
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0answers
17 views

Best way to remove drives from MDADM raid array

I have a situation with a RAID array; I'm concerned that the drives in the array are going to fail soon, and given their age, I would rather replace them sooner than later. The problem I have, is ...
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1answer
43 views

Write cache settings not working

I am using Debian 8.0 x64 with 72 GB of RAM with 4 drives configured as software RAID 0. Linux s1 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1 (2015-05-24) x86_64 GNU/Linux I tried setting dirty ...
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3answers
605 views

Best practice for 24 Disk Array

we have just migrated for our old fibre SAN storage to an IBM v3700 storwize with 24 SAS 600GB disks. This storage is connected directly to two IBM ESXi 5.5 servers each with two 6Gbps multipath SAS ...
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5answers
4k views

How long should a RAID Reconfiguration take? (Adaptec 6805)

I'm experimenting with various RAID configurations of a new Adaptec 6805 (not the 'E' model) Attached are 8x Hitachi 5400RPM 2TB SATA 6Gb Drives using the miniSAS to SATA cables provided. I created ...
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2answers
35 views

Recommended 3x SSD Raid for mysql database [duplicate]

I've been configuring dedicated MySQL server (linux) with 3x 300 GB SSD in SoftRaid. I'm trying to decide which Raid to use to get best performance. I'm expecting this database to be a read-heavy (90% ...
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7answers
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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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2answers
39 views

mdadm - RAIDs of partitions or partitions of RAID?

If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to: 1) Configure the RAID out of partitions that encompass the whole drive (like ...
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1answer
65 views

The RAID 1 Time machine

Last night my server crashed, after reboot I have found it has a disk failure The configuration is 2 x 500GB sata on Centos 6 sda3/sdb3 is software RAID1 sda1/sdb1 = ext3 for / sda2/sdb2 = swap ...
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1answer
77 views

RAID1 - mdadm mirror - not performing parallel reads as expected?

We have a three-way RAID 1 mirror which is powered by mdadm. I think I read that mdadm is supposed to take multiple simultaneous read requests and distribute them across different drives in the ...
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1answer
20 views

Striping LVM Across Multiple MD-RAID Arrays

I have a machine with three, fifteen drive mdraid RAID-6 arrays (md10, md20, md30.) These three arrays are then setup as physical volumes for LVM and combined into a single volume group. I then have ...
2
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2answers
725 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 ...
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1answer
33 views

RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
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1answer
15 views

Uneven load of 2 disks in 1 volume group

We have an application server with 2 Fusion-IO SSDs put into one volume group forming one single volume. Inside this volume there are 128 files of 40GB each accessed through memory map. When looking ...
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2answers
2k views

Why isn't my RAID array rebuilding?

Got a notice last night that a drive failed on a server. Got in this morning to replace it, and we're getting the following. Controller config report for the array looks fine, with the unusual status ...
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2answers
858 views

Bandwidth with SAS expanders and RAID controllers

Having a RAID controller that has eight internal SATA3 lanes, you can get 6 Gb/s on all eight drives. What if I connect a 24 port SAS expander to an eight port RAID controller, do I still get max ...
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1answer
73 views

SSD's in servers, best practice redundancy?

So some might say Im an experienced infrastructure architect guy and have been putting together server farms, storage subsystems and networks for a number of years in datacenter environments ...
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1answer
2k views

How to install Windows 2012 on Dell server with S110 RAID?

I have a Dell server that has a S110 software RAID 1 mirror for the boot disks. When I run the Windows 2012 installer, no drives are found. I searched Dell for drivers but the only one I found for ...
66
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13answers
29k views

Why is RAID not a backup?

When someone mentions RAID in a conversation about backups, invariably someone declares that "RAID is not a backup." Sure, for striping, that's true. But what's the difference between redundancy and ...
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2answers
207 views

Spreading RAIDs across multiple DAS enclosures

This is really a question of best practice. In a datacentre environment whereby we have a single MD3200 DAS, and for the sake of the question, 6 expansion cages (MD1200s) how would you configure the ...
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1answer
974 views

Adaptec 5405 fails to rebuild array

Yesterday one of the disks in RAID 1 mirror attached to Adaptec 5405 died and was replaced by new one but after about 2 hours of rebuilding array went offline. Hoster staff updated firmware on ...
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1answer
1k views

Cannot install grub, segmentation fault, unable to identify filesystem, superfluous RAID member, found two disks with same index — Debian 7

A server was recently transported from location A to B, a long journey that took six months. Things have gone wrong due to nothing being labeled prior to shipment. Yes, I know --- it was done by ...
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1answer
1k views

Kernel panic after boot Centos 6.5 HP DL320 B120i HPVSA

Im working with a new HPDL320 micro server (gen8-2) with a HP Dynamic array B120i My problem is after the setup. I provided the DiskDrive to the installer and everything is fine. at first i used kick ...
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1answer
48 views

Power outage during RAID1 build [closed]

I was 60% complete building a two-disk RAID1 on my Ubuntu 14.04 server with the command sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1 when I accidentally ...
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2answers
618 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 ...
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2answers
47 views

Replace Raid 5 HDD with a non empty HDD

Is it safe to replace a corrupt HDD (HDD-A) inside a Raid 5 array (enterprise class hardware) with an almost full disk which contains almost the same data as the corrupt disk (HDD-B)? Will the new ...
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5answers
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Software vs hardware RAID performance and cache usage

I've been reading a lot on RAID controllers/setups and one thing that comes up a lot is how hardware controllers without cache offer the same performance as software RAID. Is this really the case? I ...
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8answers
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Consumer (or prosumer) SSD's vs. fast HDD in a server environment

What are the pro's and con's of consumer SSDs vs. fast 10-15k spinning drives in a server environment? We cannot use enterprise SSDs in our case as they are prohibitively expensive. Here's some notes ...
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1answer
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synology “disk groups” vs “volumes” clarification

Synology has introduced some interesting terminology with their products that is confusing (to someone used to traditional storage terminology). It appears that "volumes" on Synology is equivalent ...
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0answers
14 views

HP Microserver AMD Raid controller

I have a HP N54L Microserver which i have been using successfully with Windows Server 2012. I only have the one hard drive in but want to add another in RAID 1 and then another two much larger drives ...
2
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1answer
57 views

What could be wrong with our HP Proliant Server [closed]

While observing our file server yesterday, I witnessed a BSOD, and after a restart, the Server OS (2003) cant boot. We have 6 raid drives. I noticed the disk lights and discovered the first four from ...
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1answer
33 views

How/When to physically remove a failing harddrive after replacing it in a Linux RAID?

I have a Linux software RAID-1 with mdadm. Similar to this question ("How to safely replace a not-yet-failed disk in a Linux RAID5 array?"), I want to replace a disk in a the raid. My question might ...