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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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
48 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 ...
0
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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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0answers
127 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 ...
0
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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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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, ...
4
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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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1answer
20 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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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 ...
0
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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% ...
9
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3answers
607 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
40 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 ...
1
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1answer
78 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 ...
1
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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 ...
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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 ...
1
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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 ...
3
votes
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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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 ...
1
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1answer
49 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
48 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 ...
0
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0answers
15 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 ...
0
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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 ...
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0answers
37 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
46 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 ...
0
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0answers
58 views

With Adaptec's arcconf utility, why can't I make the 'identify' command work (Adaptec 6805 controller)

I've got a pair of Linux servers with Adaptec 6805 RAID controllers in them. One is running CentOS, one is running Debian. I have the Adaptec command line utility 'arcconf' installed on both ...
0
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1answer
59 views

Raid 50 on Dell Perc H700 Integrated Resynching state

I have Raid 50 configured on a Xenserver host with a Perc H700 card and a few weeks ago, replaced a disk which had failed. The raid had rebuilt and I am now checking the status of the array via ...
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0answers
51 views

RAID-6: Two drives failure with 3ware 9650SE

We have a 6-drive RAID-6 on one of our servers. Each drive is a 750GB Seagate, and they are connected with Hardware RAID card 3ware 9650SE. We do not have sparse drives. The system is old and probably ...
26
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8answers
4k views

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 ...
1
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1answer
54 views

Seagate's 30TB NAS with SimplyRAID configuration [closed]

I recently bought a Seagate NAS Pro 6-Bay 30TB Network Attached Storage Drive (STDF30000100) from Amazon ...
1
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2answers
61 views

RAID 6 - any write amplification in 4-drive RAID?

We're planning to move from a 4-drive RAID6 to a SSD RAID 1, and I was analyzing smartctl data to see how many GB we've writen to the drives over the past year so I can estimate the lifetime of the ...
4
votes
2answers
92 views

Identify which drives belong to a specific HP RAID 5 Group

A total of 32 drives were removed from x4 decommissioned HP DL380 G6 servers (eight per server). The setup of the eight drives per host was into two RAID Groups: RAID 1 = SLOT 1, 2 = ESXi OS RAID 5 = ...
0
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1answer
33 views

Server disk failure predicted in raid1 array

I have a IBM 3650X M3 with 2 disks in a raid1 array. One of them is in "failure predicted" state. I have two question about this case: Should I trust it and change a working disk? How the system ...
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1answer
18 views

LSI Mega RAID in IBM x3690 - Hardware Failure move to spare system?

I currently have a hardware failure with an IBM x3690 having 8 SAS disks connected to an LSI Mega RAID Controller. I have a similar system (another x3690) can I place the RAID Controller and the ...
0
votes
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
36 views

postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks

I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
2
votes
1answer
186 views

RAID1 drive not seen by CentOS 7 Installer on HP ProLiant DL360e Gen8

I need to install CentOS 7 on a HP ProLiant DL360e Gen8 server. The RAID1 has been configured in the bios: I have downloaded the driver from ...
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0answers
83 views

Unexpected LSI SAS 9211-8i RAID x8 SSD Performance

After attaching 8 850 EVO SSD to my LSI 9211-8i and creating a Windows Server 2012 R2 Storage Spaces 8 column virtual disk I copied a VHD from and to the virtual disk and observed ~300 MB/s transfer ...
2
votes
2answers
51 views

ext. 2-bay USB-Drive with RAID: btrfs RAID vs built-in RAID

For backups I want to use an external USB3 Drive: two HDD with RAID 1 (mirror) in one 2-bay enclosure. As filesystem I'll use btrfs because of subvolumes and checksums. Performance isn't important, ...
0
votes
0answers
48 views

How can I find out my centos RAID setup, with a LSI MegaRAID SAS 2108 controller?

I've bought an auction box from Hetzner which allegedly has 4 3TB drives in it. As a relative newb to this sort of thing I just want to see some reassurances on the command line that this is all ...
0
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0answers
39 views

Server reverted to may after reboot

I just had a problem on a client's server, it wasn't responding to anything so I forced a reboot. The client called shortly after to say the website reverted to a version from May. Checked the backups ...
0
votes
2answers
70 views

Detection of consumer SSDs by enterprise disk controller in non-RAID configuration [closed]

We (a client) are considering [insisting on] using consumer grade SSDs (to keep the cost down) in some Dell R710 and HP Proliant D380 G5 servers. I've looked about and people report the P400 cards ...
0
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0answers
86 views

How to repair multiply-claimed blocks?

I get a lot of the following logs in dmesg: [26159.277230] EXT4-fs error (device sdb1): ext4_iget:3875: inode #394497188: comm mv: bad extended attribute block 22794025699896 [26219.914802] EXT4-fs ...
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0answers
36 views

ZFS - Reconnecting a disconnected but fully intact disk

If a disk gets disconnected from a ZFS array, but the drive itself if totally fine, what happens when you reconnect it? For example, if I have a mirror of 2 drives, if one is disconnected, then ...
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1answer
50 views

Super Micro Model 827-16 -> CentOS 6 RAID Controller driver

I have a Super Micro model 827-16 (part no: 6027TR-HTRF+) and need to get CentOS 6 installed. The problem is that I haven't been able to confirm if there are CentOS specific/supported RAID drivers ...
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1answer
43 views

Recovery from multiple disk failure using RAID level-6 [closed]

How to find a RAID level 6 scheme with ten disks such that it is possible to recover from the failure of any three disks simultaneously? Actually the question is from the book: Database System ...
0
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1answer
97 views

Windows Server 2008 RAID setup

I have a relatively old Windows Server 2008 machine that I am upgrading the disk space on. The disk hardware I am upgrading to is: 2TB WD - WD20EARX 2TB Seagate - ST2000DM001 1TB Seagate - ...
0
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0answers
39 views

How much usable space will a 2TB+2TB+3TB+3TB btrfs filesystem have with data in RAID-1 mode?

I have a pair of 3TB drives in a btrfs filesystem, and I wish to expand this filesystem by adding two more 2TB drives, using the btrfs device add command. Data in the current filesystem is mirrored in ...
0
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1answer
81 views

RAID1: approx performance difference of 3 active vs. 2 + spare?

My question concerns only Linux software RAID ("md"). I'm going to set up a RAID1 array with three devices. I need to choose between using the third disk as a spare or as an active member of the ...