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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Replacing all drives on an existing RAID 1 + RAID 5 setup - all at once or one at a time?

I'm looking at upgrading hard drives in a PowerEdge R720 and need a little guidance. Current configuration: OS: CentOS 6.5 Drives: 2 x 300gb drives (RAID 1) 4 x 600gb drives (RAID 5) I have 6 ...
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13 views

Backup Drives: Should I prefer more cache or a SAS interface?

Background: I am buying new drives for a backup server. I've found a good price on a WD RE drive that has a SAS interface but only 32MB of cache. I have to pay $40 more to get a SATA interface and ...
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51 views

Linux mdraid RAID 6, disks drop out randomly every few days

I have some servers that run Debian 8 with 8x800GB SSD configured as RAID6. All disks are connected to a LSI-3008 flashed to IT mode. In each server I also have a 2-disk pair as RAID1 for the OS. ...
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11 views

RAID1 /proc/mdstat output - is the disk a spare or is it active

I recently created a raid1 out of 2 hard drives (8tb wd red). The content of /proc/mdstat is confusing to me. This is it: $ cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [...
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17 views

raid controller strip size on heavy I/O random read

What is the best strip size for raid controller contains heavy I/O (random read) with large files (most of them bigger than 500MB) as the article mentioned this like we should not use large strip ...
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20 views

Windows Server with RAID error message after power outage - not booting

Good afternoon, We had a power outage last week at one of our remote sites which brought down the entire server room. Most of the systems came back online after the outage was resolved, but we have ...
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1answer
41 views

xfs on lvm on hardware RAID: correct parameters?

I have 10 disks with 8 TB each in a hardware RAID6 (thus, 8 data disks + 2 parity). Following the answer of a very similar question, I hoped for an automatic detection of all necessary parameters. ...
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6 views

IBM system x 3500 M3 Raid Configuration - Installation of Windows 2008 [closed]

I have this IBM Server system x 3500 M3 and have 2 460 Hard disk. I am new to the server system platform environment and as never have experience to Raid Configuration. I want to configure my 2 hard ...
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23 views

Proliant ML350p Gen8 Raid Extending

I am assisting in adding 2 more 480 GB SAS drives to a Proliant ML350p Gen8 RAID 5 that currently has 3 drives. I already know that in my setup, I need to restart the server, press F5 to go into the ...
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122 views

Suddenly slow RAID performance

We recently noticed our database queries have been taking much longer than usual to run. After some investigation, it looks like we're getting very slow disk reads. We've run into a similar problem ...
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25 views

How to stop resync and start rebuild on software raid (mdadm)?

I have RAID6 on 24 drives. The raid was setup with mdadm, so it is a software raid. One of the drives died and the server freezed due to that, so it had to be rebooted using Power Cycle (power off + ...
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63 views

How do I safely add a missing partition to an existing RAID-1 setup?

My server had RAID-1 setup and a few days ago one drive failed. I replaced it and added it back to the array. The problem is that the 3TB drive had 2 partitions: root@s01 [~]# df -h Filesystem ...
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28 views

Software Raid + LVM + Virtual Machine: File Corruption after crash

At our startup, while trying to move our applications to a new server we ran into a hung up Ubuntu 16.04 at the new server, responding to pings but ssh hanging at debug1: Entering interactive ...
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24 views

Rebuilding VHD RAID array

We have a Dell PowerEdge R420 with a PERC H710 mini RAID controller card. The server has six physical disks split over two arrays; one RAID-1 array for the OS and one RAID-10 array for the data. This ...
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20 views

What part of the server has failed if a replaced RAID-1 drive is not being detected?

I had a drive (/dev/sdc) in a RAID-1 fail, it showed as "faulty" in mdadm so it was replaced. But then the new drive was not recognised or detected at all. I ran this command after the new drive (one ...
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22 views

How do I format and properly re-add a drive to a RAID-1 array?

I had a failed drive from a RAID-1 array (2 drives) replaced and now need to: Format it. Add it back to the array. My drives are like this: root@s01 [~]# df -h Filesystem Size Used ...
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28 views

Has my RAID drive failed?

I checked the output of my server today and it said: root@s01 [~]# mdadm --detail /dev/md1 /dev/md1: Version : 1.1 Creation Time : Sat Jul 7 18:23:24 2012 Raid Level : raid1 ...
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23 views

Can PNY Enterprise SSDs work in Dell R710 with Perc H700?

To improve the performance of a Dell R710 running CentOS 7.2 and being used as a MongoDB server, I'd like to add SSDs. The PNY Enterprise SSDs (specifically the 240GB EP7011) seem reasonably priced. ...
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34 views

RAID 5, 50 or 10 with HOT SPARE Possible…? [duplicate]

I want to go for a Larger storage capacity but getting confused to use RAID Level. As have to reach the required IOPS, still maintain reasonable redundancy and have at least 5TB of logical storage ...
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71 views

Ibm V3700 SAN / Howto add additional disks in existing pool

We have IBM v3700 San Storage(300gb x 36 SAS HDD) connected to Four servers (windows 2008) via FC. Each server have few disks allocated in RAID5 mode. There are 8 unused (candidate) disks available ...
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32 views

What are the consequences of a hot-spare dying during an array rebuild?

We've experienced a failure of the hot-spare during reconstruction of a failed disk in a RAID5 array. As it seems, we actually lost some data over this, at least the storage bay is giving I/O read ...
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72 views

No Filesystem after deleting RAID

So I had the /home partition in two disks in RAID1, one disk failed so the system booted with lots of errors about that. I didn't have another disk to replace the one that failed, so I wanted to ...
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24 views

How to stop Ubuntu keeping writing degraded RAID

I have a hardware RAID (Adaptec 5805, RAID 6 of eight 6TB drives) that recently constantly fails when I have lots of disk writes. I installed Ubuntu on a separate disk and the Ubuntu seems not able to ...
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48 views

Replace faulty drive in Raid 10 using smaller drive?

I have a Raid 10 array with a faulty drive in a Qnap TS-809. The array contains the following drives: (I know it was a stupid idea to mix the drives in the first place) 1. 2TB WD Red --\ 2. 2TB WD ...
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40 views

Performance comparison of single RAID vs multiple filesystems

I'm trying to get maximum sequential disk throughput for an application on my Linux server. It has 7 SATA disks that I could put in one RAID0 or RAID5 using a hardware RAID controller (HP P420i). Or, ...
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1answer
51 views

Dell PowerEdge R720 not recognizing RAID card

We recently bought a PowerVault MD3420 and I sent Dell the specs of the server I was going to use to connect it to. They sent me a card made by LSI instead of a PERC card for controlling the RAID ...
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47 views

RAID can't rebuild Rebuild offen missing HDD

First i would likes to say the raid configurations of my server. Intel RAID 10(4*1TB HDD) two from wd, 1 from hitachi, 1 from seagate + 1 seagate as hot spare Here goes the problem the last hdd ...
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25 views

LSI megaRAID failed drive ID: 0xa - which drive is that?

I have two failed drives in a RAID5 array (yeah, I know), and I'm trying to find which one failed last so I can know which one to attempt to recover since it has the current stripe. My LSI MegaRAID ...
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28 views

Recovering a RAID5

Hoping somebody here can help, as I'm a bit stuck on what to try next. Essentially, I had a RAID5 of 4 disks in mdadm. One of the disks started failing, not enough to have mdadm eject it, but enough ...
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30 views

small client-server app & db install location

We're running Server 2008 R2 on dual 2.8 GHz processors with 32 GB memory and a partitioned 1 TB, 3-disc RAID. Seems plenty robust for our purposes. Our primary application, however, has been lagging ...
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27 views

RAID geometry parameters for XFS on top of LVM

I need to set up an XFS filesystem on top of LVM on top of a hardware RAID-6 (10x 6TB + 2 parity) and I found the guideline on http://xfs.org/index.php/XFS_FAQ ("How to calculate the correct sunit,...
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38 views

Dell PERC RAID array how to ignore error

We have a Dell PowerEdge R720 with a PERC H710 Raid Array. It is configured into two disk groups, disk Group 0 which has the OS and the data, and Disk Group 1 which for reasons unknown to me is ...
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22 views

Lights not working on HP msa 2040 [closed]

I have HP MSA 2040, it has total of 12 disks 3 of the disk lights are off. How to check the issue? Or are they off due to any configuration or raid? Another question how to check what raid is ...
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42 views

btrfs increase raid capacity by replacing disks (and not adding disks!)

I'm very excited about the new features of btrfs and would like to start tesing it. Before I get started, I would like to ask if btrfs supports increasing raid capacity by replacing disks by bigger ...
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2answers
142 views

Can't get my RAID array out of degraded mode

I've got a 4-drive RAID 10 array that has just had a drive failure. I ignorantly have never practiced how to recover from a failure (I'm a programmer, just keeping this server as a hobbyist) so I'm ...
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34 views

Raid Drive Upgrades

I have a RAID 5 setup with 5 2TB drives. If I start to replace the 2TB with 4TB, once I have enough, can the Array be moved to 4TB's? I know that if I put a 4TB in a 2TB Raid, the 4TB will recognize ...
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207 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
117 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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35 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? ...
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2answers
102 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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29 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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45 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 ...
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37 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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23 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 Keywords:...
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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 ...
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187 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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93 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 ...
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26 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 ...
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29 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 ...
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209 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 ...