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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11 views

How to expand the storage on raid 0 [duplicate]

This are my specs: Existing Spec: Model: HP Proliant DL380p Gen 8 Server Processor: 2 x Intel® Xeon® E5-2650 v2 (2.6GHz/8-core) Memory: 32GB (2 x 16GB) HDD: 1TB SAS Hot-Plug HDD Raid:0 Upgrade: ...
0
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0answers
29 views

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

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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1answer
20 views

A DegradedArray event had been detected [on hold]

at morning cPanel send me this email This is an automatically generated mail message from mdadm running on A DegradedArray event had been detected on md device /dev/md/1. Faithfully yours, ...
1
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1answer
18 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 ...
0
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1answer
30 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 ...
0
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2answers
66 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 ...
0
votes
1answer
23 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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3answers
45 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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0answers
11 views

ZFS messed mirrors up [migrated]

I have a ZFS pool with 6 drives in RAID10, well it use to... I tried to upgrade a 146GB drive to 1TB drive, and messed up bad root@x7550:~# zpool status pool: stuffpool state: ONLINE scan: ...
0
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1answer
33 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, ...
0
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1answer
45 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 ...
0
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2answers
40 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 ...
0
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0answers
20 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 ...
1
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0answers
25 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 ...
0
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0answers
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 ...
1
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1answer
21 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,...
0
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1answer
27 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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1answer
16 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 ...
2
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0answers
34 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 ...
2
votes
2answers
135 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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0answers
31 views

How can I install and run the Raid tool 'tw_cli' on server that running Centos 7?

I need to check the Raid status in my server and I was told that the tool 'tw_cli' is doing that. I tried to install it but the command line 'tw_cli' still doesn't work. What I did is : wget http://...
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votes
2answers
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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0answers
45 views

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 ...
11
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3answers
203 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
94 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 ...
0
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1answer
32 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
votes
2answers
93 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 ...
0
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0answers
24 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 ...
4
votes
0answers
41 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
votes
1answer
29 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 ...
0
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0answers
16 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:...
1
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1answer
20 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
vote
1answer
181 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 ...
1
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1answer
63 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
vote
1answer
23 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
26 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
votes
2answers
192 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
votes
1answer
27 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 ...
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votes
1answer
50 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
1
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0answers
23 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 drives....
22
votes
2answers
3k 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
votes
1answer
60 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 ...
0
votes
0answers
30 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
votes
2answers
149 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 ...
0
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1answer
24 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 ...
1
vote
1answer
39 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 ...
0
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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
27 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
86 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 ...
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0answers
16 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 ...