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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Connecting two mini-SAS SFF-8087 together

I was wondering if it is possible to connect two SFF-8087 ends together. I have two mini-SAS cables in my server. The server is from HP and both cables are from the local HP reseller. One SAS cable ...
7
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3answers
91 views

If RAID5/6 are risky due to URE, are full backup/restore schemes at risk too?

As I understand it, you have a high chance of encountering an URE during a rebuild due to having to read a large amount of data to perform the task. Does this problem also affect backup and restore ...
3
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1answer
40 views

DL160 gen9 P440 SAS cable

We recently bought a new HP Smart Array P440 RAID controller from the local HP reseller store for our HP DL160 gen9 server. (P/N: 783361-425) We want to run ESXi on the server, with three virtual ...
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1answer
19 views

max data transfer rate on RAID array

1) Let's say I have an array of twelve disc drives in a RAID-1 formation. That's effectively six drives presented for use. What's the maximum read rate I should be able to get out of that array? ...
2
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2answers
71 views

How can SSD write performance be dramatically different on two identical servers?

I am renting two identical physical servers (at Serverloft). These servers come with 2x512 GB SSD disks, and I've set them up with mdadm in a RAID1. The disks are locally installed in the server. The ...
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0answers
21 views

Best Reliability for Linux OS: FakeRAID, SoftRAID, or No RAID

I'm tasked with building a highly-reliable, unmanned industrial PC that will withstand unplanned power outages. A UPS will be used where possible, but realistically we know that many of these units ...
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0answers
12 views

Configuring external HDDs with RAID [on hold]

Quick question - and likely a very simple one. I'm new to advanced file management, and I cannot find a way to set it up. Here is my config. I have a MacBook Pro which is running OSX and Windows 7 ...
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0answers
14 views

HP Smart Array p410i Debian problems

I have server HP Proliant DL360 G6 http://h20565.www2.hpe.com/portal/site/hpsc/public/psi/home?sp4ts.oid=3884319&ac.admitted=1464192858434.125225703.1851288163 with HP Smart Array P410i ...
3
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0answers
28 views

How can RAID deal with inconsistent data?

RAID 1 and RAID 5 (and their brothers 10 and 50) achieve data redundancy respectively through mirroring and through parity checking. This allows a RAID array to still access data when a sector on a ...
0
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1answer
15 views

Dell T7500 PERC Raid

I am looking to buy a Raid card as I can not use the motherboard Raid to achieve Raid 5 or 10 with my 4 SAS drives. I am a bit confused on how I would connect the drives to card. Do I need to ...
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15 views

Installing Ubuntu Server on Raid 1: FakeRAID [closed]

I am installing Ubuntu Server 14.04.2 - amd64 in RAID 1 on my system with the following specs. SPECIFICATIONS: ASUS H97M-E 4GB 1600MHz RAM i3-4160 2 x 3TB Toshiba However, I failed ...
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0answers
6 views

Reset to device, \Device\RaidPort2, was issued

I get this warning log when the windows server 2012 starts backup service that include OS drives. Log Name: System Source: iaStorA Date: .... Event Id: 129 Task Category: none Level: Warning ...
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1answer
17 views

PERC H200i “ignoring” some disks in RAID 10 resulting in slow IO

I have a Dell PE T710 with a PERC H200i that has a single array of 6x 500GB SATA disks +1 hot spare. This server (and its disks) have been running flawlessly for a few years. Today I began getting ...
1
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1answer
159 views

zpool showing more storage than it should

I just expanded my zpool named storage with 3 HGST 6TB drives in raidz1. I thought this would add only about 11.x TB of storage (since they are really 6000GB drives) how ever now zpool list shows I ...
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1answer
40 views

Slow file transfer speeds

I have a server that is running Ubuntu Server 14.04LTS and I am currently experiencing slow network transfer speeds. This server had been running without issue now for about 2 years and suddenly I am ...
1
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1answer
13 views

HP SAS Expander 12Gb max storage limitations

Is the max storage limitation stated in HP's documentation a real limitation or not? I currently have 48TB (8x 6TB in a raid 6) and I just purchased a Norco RPC-4224 and 8 additional drives to double ...
0
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0answers
18 views

3Ware tw_cli utility shows missing port

I'm using the 3ware tw_cli utility to manage a RAID 6 array. Generally, when a drive goes bad, the tw_cli utility will show me the port with the DEGRADED drive. I can then easily identify it ...
5
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2answers
168 views

How is raid implemented at the *disk* level?

If disks have 512-byte physical sectors, and you have 10 disks using RAID 50 with a 1MB stripe-size how does that work at the disk level? Correct me if I'm wrong, but conceptually, there would be 2 ...
0
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1answer
22 views

Creating a 2nd virtual disk with PERC H700

I currently have just 1 virtual disk set up with raid 0 for my OS, and would like to create a 2nd virtual disk for just storage. Will I have any data loss/issues with the existing virtual disk by ...
0
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1answer
31 views

Why does my HP Smart Array show two logical drives as failed?

I have HP Proliant DL 380 G8 with raid 0+1 ..still its not booting in smart array controller showing 2 logical drive is failed how can we fix it
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0answers
16 views

Upgrade hard drives to larger size in a RAID 1 Setup on Dell T7500

I have a dell T7500 computer. I currently have 2 300GB drives in RAID1. I would like to replace these drives with 2 2TB drives that I have and keep the data that is currently installed on the ...
22
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2answers
2k views

What is the current state (2016) of SSDs in RAID?

There are plenty of resources available online that discuss using SSD drives in RAID configurations - however these mostly date back a few years, and the SSD ecosystem is very fast-moving - right as ...
2
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1answer
41 views

Cannot create new RAID with LSI3008 after initial setup

I have a LSI 3008 Raid Controller on my server mainboard, and 6 HDDs installed. 4 of them in RAID10 and 2 in RAID1. Now I'm trying to add 2 more HDDs with 2TB each, and after installing them into the ...
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0answers
20 views

RAID 1 disk sequential read/write speed inconsistent

I have an issue with 2 of my servers, and I'm not sure what's going on. The setup is the same for all my servers: C: 2 SSD 512GB in RAID-1 D: 2 SSD 512GB in RAID-1 The servers are DELL's, the ...
2
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2answers
111 views

DL180 G6 - ESXI 6.0 - P410 - Lost access to volume Issue

We have a DL180 G6 Server with a P410 RAID Card. The server has the following three RAID arrays. 4x2TB - RAID 10 4x2TB - RAID 10 2x2TB - RAID 1 2x2TB HD's are configured as hot spares ...
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0answers
9 views

RAID not changing write speeds [migrated]

So I have two hard drives one connect with SATA and one with USB3.0 SATA (/dev/sdc1): Apple HDD Toshiba USB (/dev/sde2): Western Digital Technologies, Inc. Elements SE Portable ...
0
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1answer
21 views

Can I use an external 3G SAS device with a 12G card?

I want to connect an old 3G SAS DAS (Dell MD1000) to a new 12G RAID controller (PERC H830 or something LSI 3108-based). I assumed it would be backwards-compatible like SATA1/2/3 is, but after closer ...
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1answer
29 views

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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0answers
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 ...
0
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0answers
25 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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1answer
80 views

SSD DD write speed lower than HDD [closed]

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 ...
0
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0answers
14 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 ...
0
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0answers
27 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 ...
0
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1answer
24 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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1answer
48 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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0answers
24 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 ...
0
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1answer
59 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 ...
1
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1answer
58 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 ...
2
votes
1answer
42 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 ...
1
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2answers
58 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 ...
0
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0answers
26 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 ...
3
votes
1answer
27 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 ...
0
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0answers
22 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
102 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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0answers
20 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 ...
0
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2answers
163 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 ...
0
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1answer
15 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 ...
1
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1answer
41 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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1answer
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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1answer
33 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 ...