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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Ubuntu MaaS RAID preseeds

I have a maas server/controller and I need to create RAIDs when I commission the nodes via preseed_master config file. The disk configurations would be 3 disk, 2 disk, or more than 3 disk per node. ...
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1answer
815 views

Proper procedure for installing CentOS on HP DL80

I have a DL80 G9 on which I wish to install CentOS 6.7. I want my master boot partition to be a mirrored RAID 1 logical volume across 2 physical disks. I have additional storage that I will use to ...
7
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1answer
147 views

How do I troubleshoot my RAID array?

I just checked into my RAID array this morning and what I got is: $ cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md1 : active raid1 sdc7[0] ...
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1answer
77 views

Changing Mirroring RAID disks - HP DL380

I have a DL380 server with raid configured as mirroring with only two harddisks ( 0 and 1) As we lost some files due to a software bug I removed both the HD's ( 0 and 1). Instead I put an old ...
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2answers
79 views

More Global Spares or dedicated spares

I have 74 x 300GB disk on a HP MSA2324sa. The magic for me is 3 x RAID10 vDisks of 16 drives each. And then 2 x RAID50 vDisks of 10 drives each. That leaves me 6 drives. I could assign 5 dedicated ...
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2answers
59 views

How to Mount Disk from broken USB external Hardware Raid 1 [closed]

I had an external USB 2 RAID 1 (Mirror) with two 2TB disks. The manufacturer is Datacask which is pretty unknown. The chip used is some Silicon Image chip. Out of nowhere, I could not mount the raid ...
2
votes
1answer
112 views

Is there any gain from using multiple files in SQL server for raid-5 configuration?

We are setting up a server with five 240GB ssd as raid-5 configuration into one logical drive. We're planning to partition the logical drive into four drives on windows server. In SQL server, would ...
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1answer
49 views

RAID 0 arrangement for max IOPS with mechanical drives

We need to run a high number of low-resource VMs concurrently in 2012 R2 Hyper-V. We've experimented with various configurations and using Perfmon.exe for reporting, we've found we're bottlenecking ...
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3answers
228 views

P440 defect, can I replace P440ar

Quick question: I have a HP DL160 Gen 9 server with P440 raidcontroller. ILO reports this one is defective. Disks are OK; after rebooting, the server works for about an hour. I have a P440AR in ...
2
votes
2answers
6k views

Install CentOS 7 on HP dl120 gen9 server with b140i raid controller

I'm trying to install CentOS 7 on a HP DL120 gen 9 server with a b140i controller. I have 4 1TB HDD setup in a raid 1+0 and the CentOS installer doesn't seem to recognize the logical drive created ...
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0answers
118 views

Smartctl output varies; some RAID does not contain attributes

I have run smartctl -a on five different computers (mostly CentOS 7 Linux with smartctl 6.2), and I noticed two styles of smartctl output. Why would it change its output format? One style contains a ...
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1answer
118 views

Check RAID software: my status

I have an Ubuntu dedicated server and I got a message from my provider saying that one of my disks has en error and that I must "check whether my RAID software is functioning properly" before they ...
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0answers
112 views

Replace failed disk in RAID 1

two days ago one of my two drives in my software RAID 1 (that was setup using gnome-disks) configuration failed. I could not access the files in the meantime. After short research it seems that I have ...
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0answers
16 views

Unable to build RAID on BladeServer HS20 8843-2RG

i have a bit of a problem. We had this Blade Server come in a few days ago, with a seemingly failing disk (the OS cried out IO Error all over the place and only booted into emgergency mode). A quick ...
2
votes
2answers
101 views

mdadm fault injection testing with bad blocks or other unrecoverable errors

I recently lost a drive in my RAID array (and got an email from the system warning me of this, which was awfully nice) and after some drive shuffling and swapping in a new drive I'm all safe and ...
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0answers
103 views

The RAID array shows up as DEGRADED, but all drives are OK

The current RAID controller I am using is an AMCC 3ware 9690SA-8I SAS RAID Controller. I have just received this server unit used, and going into this blind; I have no idea how long it has been this ...
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1answer
50 views

Handling the potential risk of writing random bits to storage during power loss with RAID [closed]

Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device? Someone proposed the following idea to address such a risk: create multiple ...
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5answers
331 views

Can I detect hardware RAID infromation from inside Linux?

When I'm inside of Linux, I can get the following information from lsblk (irrelevant drives removed from output): NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 298G 0 disk sdb ...
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votes
2answers
213 views

Slow writes for VM in Xen?

I have a server running Xen and a couple of VMs. I'm trying to set up a RAID array that's dedicated to one of the VMs in particular, which will be used for various storage-intensive purposes. ...
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0answers
111 views

Fujitsu Primergy RX100 S6 Windows Web Server 2k8 R2 Hard Drives not found

I got a question about our Fujitsu Primergy RX100 S6. We want to install Windows Web Server 2008 R2 on a complete brand new RAID 1. The BIOS finds both of the hard drives and also the virtual disk ...
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votes
1answer
99 views

How to configure expander card RES2SV240 in an Intel Server Board S2600WT?

So, I'm trying to configure this expander card into my server. I have an Intel Server Board S2600WT in a R2312WTTYS case, which means I have a backplane in the front with 12 slots, and another ...
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votes
1answer
285 views

recover highly degraded raid array

I have a Linux RAID6 array (mdadm) composed of 8 disks. 2 disks failed. I replaced them, now I have 2 new empty disks. I would like to rebuild the raid but when I start a raid rebuild, the rebuild ...
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1answer
43 views

Recently installed RAID already degraded on partition

I set up setting up a new two disk RAID1 which appeared healthy in mdstat. In a few hours, here's what I later saw when I ran cat /proc/mdstat. Personalities : [raid1] md1 : active (auto-read-only) ...
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0answers
73 views

Proper Steps To Upgrade My Server 2008 R2 Machine From HHD To SSD

I'm working on upgrading a server's hard drive from a standard HHD to an SSD drive. I have cloned the drive with a program called "EaseUS Todo Backup Free 8.6" (which I think does a bunch of extra ...
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1answer
65 views

When Upgrading My 3.5" HDs To SSD HDs Can I Continue To Still Use RAID 1 (MIRROR)?

I'm upgrading my old 3.5" HDs to a set of SSD HDs. I currently run a RAID 1 (MIRROR) array for the 2 old drives (just in case) and want to know how I should rollout the new SSD drives... I have been ...
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3answers
94 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
116 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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0answers
146 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
31 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 ...
0
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1answer
420 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
73 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
206 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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1answer
313 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 ...
1
vote
0answers
47 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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votes
2answers
291 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% ...
9
votes
3answers
2k 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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2answers
77 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 ...
2
votes
1answer
191 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
108 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 ...
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1answer
44 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 ...
1
vote
1answer
22 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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votes
1answer
584 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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vote
2answers
321 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 ...
1
vote
1answer
74 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
116 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 ...
1
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0answers
51 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 ...
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votes
1answer
82 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
91 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 ...
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0answers
94 views

Growing RAID0 to RAID5 sync delayed

I've recently switched my NAS with a single 4 TB disk to a RAID setup, with the goal of implementing a 3-disk RAID5. To do this without a 4th disk and without loosing my data, I first set up the 2 new ...
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1answer
197 views

Expanding Disk Space on PowerEdge R710

I want to expand the disk space on an R710 with a PERC H700 Integrated. It is currently configured with: 2 (3.5" SAS 6Gb/s 15000 RPM) drives in a RAID-1 For OS. 4 (3.5" SAS 6Gb/s 15000 RPM) drives ...