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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Why does SSHFS I/O latency test much faster than local RAID & NFS?

SSHFS tests for server I/O latency using dd returns very surprising results, so much so that I'm worried this might be some problem either with the test method or configuration. Test 1 on local RAID ...
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14 views

Add more Drives to a RAID controller using a seperate\another SAS expander or Controller?

I have a custom build server. It currently has an LSI MegaRAID LSI00295 (9266-8i SGL) PCI-Express 2.0 x8 Low Profile SATA / SAS RAID Controller configured with 8 3TB drive in RAID 6. Can I add more ...
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8 views

About Raid5/6 merge small files in single stripe element

I have look a lot of articles, but I can 't understand how the raid save some of small files in single stripe element. Here is the raid 5 example: 4 disk * 16K stripe element size = 64K stripe ...
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66 views

SSD DD write speed lower than HDD [on hold]

I've come across a strange phenomena with a new dedicated server that's been provisioned. The server has 2x1TB HDDs in software RAID 1 and a separate 120GB SSD that is intended to be used as a ...
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8 views

Dell SAS 6ir suddenly can't find boot devices

I have a Dell Poweredge R300 with a Dell SAS 6ir RAID Controller that's worked perfectly for years. It has two 500gb drives configured in RAID 1. We had a long power outage the other day that ...
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26 views

Does this RAIDz setup suit my situation? [closed]

I am looking into buying a few drives to set up a FreeNas box for home storage. I will be storing movies, pictures, music and very private information (that I really, really dont want to lose) on the ...
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24 views

Confusion on how to hotswap dm-x device in software raid

Below is the dump when I do lsblk cat /proc/mdstat lmsetup -ls. So sde is dying and I would like to replace it. What i'm confused is, in lsblk it shows sde is part of md3 (software raid). but when I ...
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20 views

Firmware RAID5 and SED on Linux

I have three HDD's (Seagate ST4000NM0053) in a RAID5 set-up using firmware RAID (RSTe 4.0, Intel® C612 chipset) on Debian 8.4. They are SED, so I would like to set the ATA password. Unfortunately, my ...
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25 views

Installing CentOS on HP Server, SSDs connected to a RAID controller

I am trying to install centOS 6.0 in this HP Server, I contacted with the support and they said me that it supports that OS. I have no problem installing it on a SSD that is connected directly to ...
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16 views

Logical Drive 1 Fatal Error System Logs

When a Client Backup starts on my 2012 Server Essentials, it fails and I receive the following error in my System log: Logical drive 1 of array controller B120i [Embedded] returned a fatal error ...
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23 views

Convert single disk raid0 to raid1 on an LSI megaraid controller

I have a server with an LSI Megaraid raid controller which has a single disk for the OS configured in raid0 What i want to do, is add a second brand new disk for redundancy and convert the raid0 to ...
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24 views

Converting to Hardware Raid from default Software Raid, backplane 1 connector A0 is not connected Issue.

I have a newer Dell R330 server that came with three 128GB SSD's as well as a software raid S130. After setting up a Raid 1 with single hot spare, I realized that ESXI is not fully compatible with ...
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1answer
39 views

Why shouldn't I use striping raid on the partition I boot from?

The Gentoo Handbook says: You should not use any form of striping such as RAID-0 or RAID-5 on the partition you boot from. Why is this? I've never seen a similar warning before. Grub supports ...
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2answers
50 views

128k stripe > 64kb AUS > 4kb AUS

I have a RAID5 of 3 x 2TB set to 128k stripe. The volume is formatted in Windows with 64kb Allocation Unit Size (AUS), and within that volume I have multiple virtual hard disks where guest operating ...
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17 views

Recovering Megaraid Storage Array After Power Outage

I suspect I know the answer to this (namely, that there is no hope whatsoever), but thought I'd take the liberty of asking the question in the unlikely event there may be some hope, however remote it ...
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1answer
22 views

Dell PowerEdge Maximum Disk Size

I have a Dell PowerEdge 2900 server which I am trying to setup as a NAS. I have not done any firmware upgrades to the RAID controller or anything like that. What I need to know is what the maximum ...
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18 views

LSI RAID-100 FILE COPY BETWEEN RAID AND JBOD

Setting up new Lenovo TS-440 server which includes the built-in LSI RAID-100, currently configured with two 1TB drives mirrored and (1) 1TB drive as a JBOD. Can copy large amounts of data between ...
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2answers
87 views

How to correctly create a filesystem on disks that are connected to a RAID disk?

I want to create a ext4 filesystem on sda, sdb, and sdc and mount them to use them but I don't know how to handle all the raid stuff. lsblk output: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda ...
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14 views

MegaRAID Rebuild required after PdOffline + PdOnline?

In a RAID6 array with 12 disks I have taken a disk offline to flash new firmware, then brought it online again: MegaCli64 -PdOffline -PhysDrv[8:0] -a0 MegaCli64 -PdFwDownload -PhysDrv[8:0] -f ...
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2answers
64 views

Smart array P410i Maximum hard drive capacity?

I've looked for quite a while and for some reason can not find this info anywhere, the HP quickspec document search (Which they recommend) doesn't bring up anything. I have a proliant DL380 g6, and ...
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1answer
12 views

How to keep md-raid from blocking IO?

I run a server with md-raid (software) level 1 (2 HDDs mirroring) and several different applications run on it. The problem arises when file-intensive jobs (e.g. extracting large archives) run while ...
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1answer
34 views

Replace failed RAID 1 Drive on Intel Platform

Good afternoon, I have a Intel Server running Windows 2008 R2 Standard. It has a RMS25PB080 Raid controller card in with. It has two logical drives, a RAID 1 and a RAID 5. The one harddrive on the ...
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21 views

RAID5 now showing as two virtual disks instead of one

We have an old PE2950 that was just about to be decommissioned and were told that nothing of importance was on it. After a power failure the other day it came up saying that the RAID array was a ...
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23 views

hp proliant DL 180 G6 P410 cant enter raid bios

Given this HP Server with P410i raid controller. It doesn't see any attached disks most likely because they are not defined in the RAID bios and I don't see a way to enter there. I have tried ...
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30 views

Advice needed about RAID and partitioning new server

first of all i want to appolagize if i doublepost. Plese merge this with similar post. Thank you. Now about the situation and the system we are trying to build and want an advice from experienced ...
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40 views

RAID10 array lost after reboot | Amazon Linux

I carefully followed this procedure to setup RAID10 on Amazon Linux: https://mongodb-documentation.readthedocs.org/en/latest/ecosystem/tutorial/install-mongodb-on-amazon-ec2.html I also upgraded ...
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1answer
46 views

Will a H310 Mini or a H200 support Samsung SSDs (840/850 Pros)?

I've been searching around and struggling to find out of a H310 Mini or a H200 will run Samsung 840/850 Pros. I know Dell have their officially branded SSDs, but unfortunately cost is a major issue ...
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10 views

Is a PERC310 Mini compatible with an R610?

I'm going to purchase an R610 soon which is sans RAID card. The spec sheet lists 2x PCIe x8 + 1 "storage x4" slot. However none of the X10 series cards are listed on the spec sheet. I presume that's ...
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3answers
845 views

Is using nested RAID 6+1+0 a good idea?

Currently I have 24 disks of 500 GB, and I would like to create a bigger nested RAUD using a Dell Power Edge R730 server, having 4 times RAID 6 with six times 500GB each, over them I want to add RAID ...
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36 views

Which raid array will be best practices with seven 1.2 tb hdd system

I have a server which have seven 1.2 tb hard disks. I have to create raid array but i don't decide which raid i use? First of all, first and most important matter is security. At any cost i must not ...
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19 views

Linux softraid showing failed drive, but smartctl shows no errors

I have a RAID6 array that is offline (shows 3 bad drives): cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md2 : active raid6 sdh1[11] sdg1[10] sda1[0](F) sdm1[9] sdl1[8](F) ...
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19 views

Recovering grub2 after raid1 disk change: stage1 not read correctly

After recovering from a raid1 disk change I cannot install grub2 any more. I think that I recovered from the disk change correctly (the raid array assembles, I can mount and access the data, etc.) but ...
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1answer
19 views

RAID5 array over-provisioning by creating smaller array?

I did actually read the following thread: How to over-provision an Intel SSD RAID Array via the Dell H700 PERC RAID Controller It did give much information, however not an answer to my question in ...
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1answer
33 views

Configuring FreeNAS on Hardware RAID

I have a server with 16 Gb RAM and 4x1TB HDDs configured as RAID 10. Now I have to configure that server for the FreeNAS, but I have found that the FreeNAS won't support the Hardware RAID. Instead, ...
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3answers
42 views

find out RAID level on HP DL360 server

I have a HP ProLiant DL360 Gen9 server which has three physical 900GB HDDs. Those three HDDs are in some sort of hardware RAID setup. RAID controller is HP 3239 and it uses hpsa driver. For OS it ...
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12 views

PERC controller and all 12 hdds in RAID6

i have a question about my DELL ds12-nv7, the controller RAID is perc 6i, i have 12 hdd. The card controller has 2 controllers. I can see that i have 8 hdd on controller 0 et 4 hdd on controller 1. ...
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51 views

Install CentOS 6 on HP ML 150 gen9 server with b140i raid controller

I have HP ML 150 with Smart Array b140i controller. I want to install CentOS 6.6, but the driver isn't built-in the ISO. I have download the Driver and install in the USB(dd). I need the command for ...
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1answer
46 views

Slow RAID & system performance on large file write

I'm moving a large VHD file to a new VM host over the network. I've checked and double checked every point of bottlenecking here and it is 100% the server doing the writing causing an issue. It's a ...
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2answers
47 views

Can I setup Raid 1 after the system is already running

I just finished installing owncloud server using centos 7. My data is located at /var/xxx and I dedicated the hard drive/dev/sdb just for this /var directory. After a while, I decided that I wanted to ...
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53 views

Restore RAID 5 HP P410

I have: P410 + 512MB Battery Backup 4x4TB in RAID 5 I changed the PSU today and after starting OS (Windows 2008 R2) the array is gone. ACU sees 2 HDD as unassigned and original RAID 5 as 2 OK ...
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34 views

Having trouble mounting an mdadm array. Corrupted Filesytem?

I have a server that crashed and won't power on. I don't care about the server, but I'd like to recover the data attached to 2 external usb drives that were mirrored (raid 1) using mdadm. This system ...
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1answer
40 views

Which RAID configuration is better for hypervised Virtual Machines with three 300GB SAS drives [duplicate]

Probably a noob question, but I'd like some guidance on which RAID configuration is best in this server scenario. I am aware of and understand the different RAID configurations, but am after guidance ...
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18 views

Is it possible RAID/LVM Stripe that can lose a disk/data but volume itself stays available?

Firstly, I want to make it clear I don't care about data loss, and I understand the risks involved. What I'm looking for is guidance and if what I am hoping for is even possible. My Scenario: I ...
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1answer
28 views

Raid device on rename appended with _0

I am creating various raid configurations. When I create a raid device say 5 with 3 disks mdadm --create /dev/md/md5 --level=5 --raid-devices=3 /dev/sda /dev/sdb /dev/sdc It does create a device ...
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39 views

CentOS 6: SATA link down when scanning for unused drives

I recently inherited a CentOS 6 server with 8 installed hard drives. 6 of these drives were going to be configured as an LVM, but never got that far. The drives are installed and, from what I can ...
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24 views

RAID 10 (2+2) and (4+4) - terminology or physical setup?

I understand what RAID10 (2+2) is (stripped mirror) whereby there are data are striped across 2 groups and each group have a pair of mirror devices (2 disks). This is how i have understand "2+2" For ...
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29 views

Server Frozen - RAID Card throws PD errors and BBU missing

Our server runs Win Server 2008 R2 and has an Intel Raid Card. We have been seeing PD errors from it. The PD errors have appeared on 2 drives out of the 8 in the system. We also saw errors like these ...
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7 views

LSI- Consistency check keeps restarting after completion

I have an Intel/LSI controller that keeps looping a consistency check after the creation of a RAID10 or a RAID6. All of the disks are fine from what I can tell (SMART is good, and they all pass ...
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2answers
36 views

mdadm not assemble after restart

I have 2 disk with the next structure: lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 3,7T 0 disk ├─sda1 8:1 0 2,7T 0 part └─sda2 8:2 0 931,5G ...
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3answers
77 views

How do you securely shred a file from a RAID 6?

I'm looking for a way to delete a file from a RAID 6 implementation in a secure fashion (shredding). Do I need to delete the file from the RAID, disassemble the RAID, wipe the free space of each ...