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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File IO being slow

I've rented this root server with a RAID1 mdadm software raid setup. Using dd to benchmark the file IO speed it achieves 230MB/s write (default blocksize). Certain tasks such as mysql are way slower, ...
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17 views

Can I use external SFF-8088 connector as a inexpensive way to get 2 more internal SFF-8087 ports?

Here's the scenario: I'm shopping between the LSI MegaRAID 9280-16 and 9280-24. Both cards have a single external 8088 connector, but the difference is whether they have 6 or 4 8087 internal ...
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19 views

Intel Rapid Storage Technology install failure [migrated]

When I try to install IRST, it runs for a bit and then a popup appears saying that setup.exe had a problem. Expanding the details produces this: Problem signature: Problem Event Name: ...
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0answers
8 views

How to change bootable logical drive via arcconf (Adaptec 6805 controller)

I've got an Adaptec 6805, with two RAID 6 arrays attached - 4 drives each. I'd like to change which of the two is the one that it boots from. Is there any way to do that with the Adaptec 'arcconf' ...
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0answers
14 views

Dell C2100 - Replacing Per 6/i with Perc H200

I have been googling a bunch this morning and am having a hard time verifying that my setup is going to work and was wondering if i could get some quick feedback/advice. I have a Dell C2100 which ...
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1answer
28 views

Remove a drive from a 2-drive RAID 5 array using version 1.2 metadata?

My situation is nearly identical to "How to remove a drive from a non-standard 2-drive RAID 5 array?", except my 2 TB RAID5 is using mdadm super block version 1.2. According to the best answer, ...
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2answers
31 views

NAS RAID5 & Crash Scenarios

I need to validate my understanding on RAID. I'm planning to buy a Synology (or QNAP) NAS and plan to mount 4 HDD (4To each) in a RAID5 group. I’m considering several crash scenarios : one hard ...
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1answer
21 views

Recovering data from a RAID built with fakeraid [on hold]

I have (had) a motherboard that supports (supported) fakeraid, which I used to build a RAID 1 with 2 WD Red 1TB. My motherboard died (as you would have guessed already) and now I have 2 options: Buy ...
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0answers
10 views

BTRFS new device cannot be added

I have a raid10 setup with btrfs with 5 disk currently: Total devices 5 FS bytes used 6.89TiB devid 1 size 3.64TiB used 2.83TiB path /dev/sde devid 2 size 3.64TiB used 2.83TiB path /dev/sdd ...
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0answers
19 views

Recover overwritten RAID5 array (XOR)

as I've mentioned in a recent question (RAID5 rescue with LVM2 running on it) I'm rebuilding an RAID5 array. Now, I think that the initial wrong mdadm --create ... command has started the ...
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1answer
17 views

Ubuntu - Folder replaced by lost+found/ on raid1 disks

Running Ubuntu Server 12.04 LTS I have setup a RAID1 on disks sdb & sdc (md0) following strictly this tutorial which I guess is very classical. I loaded data on my disk for archive purposes. A ...
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1answer
54 views

Low SSD mdadm raid0 performance

I have got ubuntu server 12.04 with software raid0 intel sata3 ssd(2*480GB). raid is used for postgresql database. There is 51% of raid space is free. After postgres shutdown, "dd" command shows ...
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1answer
40 views

Does the amount of disks in a RAID10 matter for a Microsoft SQL server in regards of the block size?

We are planning to deploy a Microsoft SQL Server and to store the databases on a RAID10 (RAID1+0) block-level-storage. Does it matter how many drives altogether I put into the array for optimum ...
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4answers
868 views

Software vs hardware RAID performance and cache usage

I've been reading a lot on RAID controllers/setups and one thing that comes up a lot is how hardware controllers without cache offer the same performance as software RAID. Is this really the case? I ...
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2answers
100 views

Samsung 850 EVO + HP P410 limited iops?

I´m experiencing a weird write iops limitation with a HP P410 256mb cache controller and 4x consumer grade ssd´s (Samsung EVO 850) in RAID5/10. After upgrade to latest firmware (6.64) for HP P410 ...
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1answer
305 views

Rotate entire disk set in RAID0 array?

We have a Lenovo RD430 with a RAID 500 controller. Installed in the server are 6x 4TB drives configured as 2x RAID0 arrays of 3x 4TB each, however, we also have another 3x identical 4TB drives and ...
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2answers
57 views

After power loss, my RAID config changed, some drives marked as foreign, but all data still there

I have a Perc 5/i in a Dell Precision 590. The controller DOES have a battery backup, and the controller reports that its status is healthy. There are five 1TB SATA drives connected to the controller. ...
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3answers
55 views

Resize RAID partition with GPT partition layout, without LVM

OK so I am a freelance sysadmin. I was asked to resize root partion (/) because it was 20Gb and /home was 3Tb. What I wasn't told is that the server is using RAID and GPT, so I can't use fdisk but ...
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0answers
23 views

Ubuntu Server 12.04. Software RAID1 state degraded with a spare drive [migrated]

After a disk failure, this is the output of mdadm --detail /dev/md2 in my Ubuntu Server 12.04: /dev/md2: Version : 1.2 Creation Time : Thu Dec 27 10:51:42 2012 Raid Level : raid1 Array Size : ...
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0answers
28 views

Proper Partition Alignment

I'm trying to follow the advice from this TechNet article about partition alignment. Our San is an EMC, the disks are in a 4 disk raid 10. This services an I/O intensive application, 60:40 write:read. ...
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0answers
17 views

Proxmox VMs Fail to start on reboot due to unmounted drives

For whatever reason, I have to re-assemble my RAID arrays on boot, I don't know why, and Ive banged my head against my desk over that issue to much already, so I put the RAID mdadm commands in ...
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0answers
37 views

Raid 1 seeding to speed up identical installs

I was thinking of installing Ubuntu on one of our Dell servers in a RAID 1 configuration, then using the mirrored drive as the primary drive in a second identical server with another RAID 1 setup. ...
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1answer
19 views

Do I need FIS-based switching for Linux software RAID when *not* using a port multiplier?

I'm planning to build a home NAS with an ASRock AM1H-ITX with four S-ATA disks. According to the manual the board features two S-ATA controllers: 2 x SATA3 6.0 Gb/s Connectors by AMD AM1 Series ...
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36 views

Get disk serial number by smartctl under raid0 of LSI

I'm trying to get the disk serial number of disks attached to the Centos server. When there was no raid0 (under LSI), I can get the serial number and model of /dev/sdb by: smartctl -i /dev/sdb and ...
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1answer
32 views

How do I prevent Windows from presenting software RAID discs as a single volume?

Here's my issue: I had a server's software RAID fail. I don't believe it's the hard drives, as they are brand new RE drives from Western Digital and the RAID software said that 2 dives had failed. ...
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0answers
21 views

Solaris drive type unknown

I have a server running Solaris 11 with a disk array. I am getting following error when trying to mount the disks: indika@server:~# mount /dev/md/dsk/d14 /mnt/storage/ mount: /dev/md/dsk/d14 no such ...
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1answer
40 views

HP DL360 G5 RAID controller not recognizing drive bays 5 and 6

I have an HP DL360g5 bios P58. With a Slot 0, HP Smart Array P400i Controller (256MB v2.08) The server originally was running Windows Server 2003 with 2 72GB 15k SAS drives in RAID0. One of the ...
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2answers
50 views

What is RAID 5 write logic with 8 drives running SQL 2008?

We recently had a raid array fail on a SQL 2008 server with 8 x 73GB drives. (Dell 2950). There were two drives that went bad (one had been bad for a few months it seems and was not caught...). To ...
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0answers
4 views

SSD's or HDD's in a LANcache? [migrated]

I am building a LANcache for a lanparty that I'm organizing. We have about 80 visitors (pretty small LAN), but our uplink is limited to 100mb/s due to reasons and it's constantly saturated with game ...
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0answers
36 views

Unable to install grub to software Raid array in Ubuntu

How do you ensure Grub is properly installed on a software RAID array in Ubuntu? I have a failed RAID array on an Ubuntu 14.04 server. When I first tried booting it, the Grub screen came up, but ...
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15 views

How to diagnose RAID drive showing incorrect size

I have a software RAID1 array on Ubuntu 14.04. Each drive has 1TB, for a logical size of 500GB. Suddenly, one drive started reporting it only had 4.1GB and I can no longer run any SMART self tests on ...
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1answer
36 views

How to fix destroyed software RAID after Ubuntu upgrade

I upgraded a headless server from Ubuntu 12 to 14 following the built-in do-release-upgrade script. It seemed to run fine until I rebooted, and was left with an unusable machine. After the grub ...
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3answers
63 views

Can Docker Corrupt a Software RAID Setup? [closed]

I read that software RAID should not be implemented on a machine that also has ESXi virtual machines running. Does this mean that I would want to avoid LVM and or LXC/Docker containers as well on this ...
0
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1answer
27 views

Data recover hardware raid vs zfs pool

How does one recover data after disk failure in zfs software raid or Synology hw raid? Is it easier , less corruption in one or other ? Is one more susceptible to write corruptions than other ? ...
2
votes
2answers
40 views

How do I override grsec?

After a reboot recently, I have a pair of servers that are now unable to monitor their disk status. Nagios reports: HP RAID Array UNKNOWN Error: No controllers detected. -/-/- (LD : []) I get the ...
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0answers
20 views

Windows: serveraid m5000 raid status

I have 4 ibm x3650 m3 servers with ServeRAID-M5000 and windows 2012 r2 onboard. I'm using check_mk plugin to monitor controller, which runs megacli.exe -LDInfo -Lall -aALL -NoLog which returns No ...
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2answers
49 views

Raid Information Through ESXi

I have created a few virtual disks using Raid controller from a Dell server. And then I installed ESXi on the server. But when I view the virtualdisk on the esxi under storage, I see all of them, but ...
1
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1answer
30 views

Rescue mdadm RAID 6 array after three disk events

mdadm 3.2.5, 14 disk RAID 6 Had a drive failure Friday. Two more today in rapid succession. All drives seem fully operational. This is roughly 40TB array, I could use your help please to rescue ...
1
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4answers
124 views

mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?

Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...
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0answers
37 views

How do you figure out why a drive is dropping out on a Marvell Raid Controller?

I just got a Marvell SATA Raid controller for my Dell T-410 (the existing Raid card was full 0+1); trying to use it with 2 drives in Raid-1, but one of the drives keeps falling out. The log shows ...
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1answer
156 views

How to load hpvsa.ko (RAID controller B120i) module in Centos 7.1, (seems no longer supported)?

First when RHEL 7.0 and Centos 7.0 was released - I was able to install OS on B120i raid controller by following official RHEL 7.0 and HP docs: First you need to download from HP B120i controller ...
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1answer
127 views

Install Centos 7 or Ubuntu 14.04 on HP DL160 G6

I have recently bought a couple of 2nd hand HP DL160 G6. I have configured the internal B110i in RAID 1+0 (using four SATA disks). When I tried to install either Centos 7 or Ubuntu 14.04 LTS on the ...
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0answers
17 views

An ext4 filesystem spanning multiple RAID arrays and calculating alignment parameters [closed]

So I have the following setup: 3x4TB RAID-5 (Hardware RAID) (two data disks) 5x2TB RAID-5 (Hardware RAID) (four data disks) = six data disks in total? These will be encrypted using LUKS and then ...
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1answer
86 views

Ubuntu Server 14.04 TLS plus Hardware RAID

I have just completed hadrware installation of my new RAID server which will run with Ubuntu Server OS. I have installed Ubuntu Server OS and everything run seemingly without problems. However, I ...
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2answers
62 views

Can you change raid type on an active server?

I was just dabbling with a few different raid types recently for some performance testing and I was hoping someone could answer this question for the sake of knowledge. Is it possible to change the ...
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2answers
87 views

RAID1 very slow with LSI card and 2x Samsung EVO 850 drives

not sure if I'm checking it correctly, but here is what I have. Desktop, LSI 9260-8i card, see config below. 2x 500Gb Samsung 850 EVO drives. I also have Samsung 830 drive attached to motherboard ...
0
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1answer
26 views

Removing RAID-Treating drives independently

I have a server with a 3ware Inc 9750 SAS2/SATA-II RAID PCIe controller. The server has a non-RAID disk for the OS and 4x1TB disks in RAID-5 to store data. For reasons that have more to do with ...
0
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1answer
74 views

What are the Pros & Cons of Software RAID vs Hardware RAID of 4xSSD(512Gig) in RAID10?

I'm getting this server: Supermicro SuperServer 6018R-TDW It comes with this motherboard: Supermicro X10DDW-i I've decided going with 4xSSD(512Gb) in a RAID10. My server is busy with a demanding ...
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3answers
941 views

What are the pros & cons of 4xSSD(512Gig) in a RAID10 vs. 2xSSD(1Tb) no RAID?

Lots of read and write operations that my current setup of 4xSAS15k drives in RAID10 is having made me think of a new fast storage. My server is busy with a demanding database, lots of pages, php ...
0
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1answer
81 views

Unable to access QNAP NAS

I have a QNAP TS-879U-RP that is 2.5 years old (Firmware 3.7.1 Build 20120614), installed with 8 HDD (Seagate ST3000DM001-9YN1CC4H). I am having trouble accessing it after an unscheduled shutdown due ...