1
vote
1answer
54 views

How to display/define Mirror/Stripping pairs with mdadm

I want to make a standard linux software Raid10 over 4 HDD. The server has 4HDDs, 2 pairs from different vendors in order to avoid batch problems. I want to have the mirror over two different ...
1
vote
3answers
102 views

SQL Server 2012 RAID Setup and Performance [closed]

At my company we are in the process of setting up a new SQL Server 2012 box. We have 6 physical drives with 3,000 gigs each. We are considering two different RAID configurations and are wondering ...
1
vote
2answers
122 views

Indepedent pairs of RAID 1 is superior to RAID 10

I am rather new to databases. I was reading up on RAID Storage and it seems that the consensus is that RAID 10 is RAID 10 is best is terms of performance and redundancy However at the end ...
0
votes
2answers
221 views

LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

I'm trying to add a RAID10 SSD Cache to a VD by this command: [root@livecd storcli]# ./storcli64 /c0 add vd cachecade type=r10 drives=252:4,252:5,252:6,252:7 assignvds=0 Controller = 0 Status = ...
1
vote
2answers
74 views

RAID 1 - IOPS Write Penalty 1 or 2

I keep seeing articles describing the RAID IOPS write penalty for RAID 1 (and RAID 10) as 2. RAID 0 would have a penalty of 1, of course, since every write is simply written to disk. RAID 1 is ...
0
votes
0answers
202 views

LSI MegaRAID LINUX got Optimal after degradation but strange POST message

Linux server box with LSI MegaRAID controller got degraded. But after some time RAID status changed to Optimal. Adapter 0 -- Virtual Drive Information: Virtual Drive: 0 (Target Id: 0) Name ...
1
vote
1answer
64 views

Growing a hardware RAID-10 array

I am interested how to grow a RAID 10 array on Windows SBS 2011 machine? Basically I have added two additional disks, expanded array and now I want to grow my c: filesystem to take advantage of new ...
1
vote
2answers
403 views

How to move RAID 1 to RAID 1+0

I have two HP disks in RAID 1 (300 Gb), and would like to at 2 additional disks in RAID 1+0 having in total of 600 Gb on C:. I would like to know is it possible to do it using Array Configuration ...
0
votes
1answer
189 views

How do I check if server really has RAID 10 enabled?

I have a dedicated server with 4 hdd and RAID 10, with Cent OS 6.4 How can I check if RAID is really enabled. I'm in doubt because on another server with RAID 10 enabled, I can see in /dev sg0 sg1 ...
0
votes
1answer
79 views

Does the built-in CentOS software RAID distribute writes?

Will I see a write performance increase going from single disk to CentOS Software RAID10? Any industry estimates on the % increase?
1
vote
0answers
183 views

Expand Raid 10 set on MegaRAID LSI 9261-8i

I have an existing Raid 10 drive with 8 drives. 4 in each span. I can't figure out how to expand the set by adding two more drives, one to each span. I'm using the MegaCLI command line tool. I ...
2
votes
1answer
133 views

Concerns of simultaneous failure of SSD Raid1

Since SSD's have a write limit requiring wear leveling one would assume that all things being equal 2 identical SSD drives would wear nearly identically if they mirror data writes. When one drive ...
2
votes
1answer
1k views

How to create Raid 10 with megacli

I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in ...
0
votes
2answers
124 views

Increase the size of software RAID 10

Currently I have 8 disks each of size 32G forming a RAID 10. Now, I want to increase the size of this RAID by adding extra disks. This is a production device so there is already critical data in the ...
-1
votes
3answers
264 views

Raid 0, Raid 1, Raid 5, Raid6, Raid 10 Read/Write performance? [duplicate]

Assume a single disk has a baseline of 1W & 1R performance, how does the different RAID configurations behave? My initial guess: Raid 0: 2W 2R Raid 1: 1W 2R Raid 5: ? ? Raid 6: ? ? Raid 10: ...
2
votes
1answer
69 views

Update RAID 10 NAS storage

I've got a NAS with 4x500GB HDD in RAID 10. I want to change the actual HDDs to others of 1TB capacity, but I want (if possible) to preserve the data without having to copy it outside the NAS. The NAS ...
-1
votes
2answers
952 views

One drive failed in my RAID 1+0 array, am I safe to replace it without losing data? [duplicate]

The first drive in my 1+0 RAID array is showing a status of predictive failure. There are two drives in the array; is it safe to replace this without losing any data? I will be replacing it with the ...
1
vote
1answer
467 views

Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os ...
0
votes
1answer
321 views

Raid 10 - Very slow [closed]

I have Software Raid 10 setup, it has been working great a few months. When I did a quick HD speed test: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync It is taking forever and I had to ...
0
votes
1answer
260 views

How to re-add a RAID-10 failed drive on Ubuntu?

I have a problem that I can't seem to solve. We have a Ubuntu server setup with RAID-10 and two of the drives dropped out of the array. When I try to re-add them using the following command: mdadm ...
0
votes
3answers
768 views

RAID 10 or RAID 50 on 16x 900 GB 10K SFF disks

What type of RAID would you recommend for a single storage segment across 16 of 900 GB 10K SAS SFF disks on an EMC VNX 5100 storage unit? Disk 17 is a hot-spare. RAID 10, RAID 50 or something else? ...
1
vote
1answer
487 views

raid10 in mdadm reports incorrect “Used Dev Size”

I previously had a raid5 with mdadm using four 2TB drives. I've recently disassembled the raid and created a raid10 with six 2TB drives, but mdadm --detail is showing "Used Dev Size" as only 2TB (the ...
1
vote
1answer
117 views

Building hybrid RAID10 + RAID5 environment

I have the following configuration: simple video surveillance system (server 1: recording past 24h; server 2: recording past 30 days). I am primarily using the content on the 24h storage, while I ...
1
vote
0answers
168 views

four-disk md raid10-far can be assembled and ran as “clean, degraded” with only 2 disks. Bug or i'm missing something?

Today i was solving raid failure on raid10-far with four disks. One disk failed and another wasn't re-added after a hard reboot. The mdadm -D was reporting it's clean and running with only two out of ...
2
votes
0answers
922 views

Calculating correct stripe size for Linux mdadm RAID10 arrays in “far” layout

I'm creating RAID10 array from 6 drives. When created in near layout, e.g. mdadm --create /dev/md2 --chunk=64 --level=10 --raid-devices=6 --layout=n2 /dev/sda1 ... Checking stripe size as ...
4
votes
1answer
315 views

How to recreate a RAID 10 array with mdadm

So our virtual machine has broken (it's actually a Linux machine in Azure) on which we were running a RAID10 array of 4 disks. It's an ubuntu box. From what I can tell the four data disks are fine, ...
-2
votes
2answers
2k views

RAID 10 vs RAID 1 SSDs [closed]

I'm considering moving a large database from mechanical disks to SSDs. My initial instinct was to go for RAID 10, but further research suggests that this configuration can significantly reduce the ...
0
votes
1answer
257 views

Server Config Software Raid Slow Read

I have 6x WD Caviar Black 1,5 TB in Software RAID 10 / 1 / 0 (Centos 6.2 / mdadm) cat /proc/mdstat Personalities : [raid10] [raid0] [raid1] md0 : active raid1 sdf2[5] sda2[0] sdb2[1] sdd2[3] sdc2[2] ...
2
votes
0answers
426 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
2
votes
1answer
930 views

Estimate the IOPS in RAID 10

According to http://en.wikipedia.org/wiki/IOPS For example SAS disks provide ~200 IOPS each. For RAID 10 consisting of 4 such disks. How much IOPS I could expect for that array? I would think it ...
9
votes
1answer
632 views

Why does df shows only half the size of a RAID10 array?

I've created a RAID10 array using 4 75G drives, to create a storage of 150G. After everything finished (including the initial syncing), everything looked good except the output of df -h which showed ...
2
votes
1answer
410 views

RAID 10 or RAID 1 x 2 for Hyper-V with AD, EXCHANGE on Windows 2008 R2

We have 2 servers which have 6 SATA 7200 disks inside (each). We want to configure both servers so that they will have Window Server 2008 R2 Enterprise installed and on top of it Exchange 2010 x2 (for ...
0
votes
4answers
653 views

SQL Server: One 12-drive RAID-10 array or 2 arrays of 8-drives and 4-drives

Setting up a box for SQL Server 2008, which would give the best performance (heavy OLTP)? The more drives in a RAID-10 array the better performance, but will losing 4 drives to dedicate them to the ...
2
votes
3answers
792 views

HP DL180 G6 P410 8x SATA 1TB, what is the optimal configuration?

I have a HP DL180 G6 with a P410 raid controller. Presently this runs using 4x 1TB Samsung Spinpoint SATA drives, in a RAID10 configuration using default settings. I am about to add a backplane to ...
-4
votes
1answer
548 views

Debian Squeeze with RAID 10

I'm trying to do a fresh install of Debian Squeeze on a server and set it up with RAID 5, or RAID 10 if possible (4 disks). I'm having difficulty finding detailed instructions on how to do this. I'm ...
1
vote
1answer
165 views

RAID config. for a Heavily Used File Server

I'm building a new file server to replace an existing server. The current workload is about 50 connections that are heavily reading and writing files all day long. It is about 50/50 read to write. ...
1
vote
2answers
2k views

Why MongoDB docs recommends to run Raid 10 on EBS?

They seems like to talk only about performance, which I believe it's not the case compared to other hybrid RAID types. See here: ...
0
votes
1answer
457 views

Hard Drive chugging noise when moutning Logical Volume to file system

I have a server (Ubuntu 11.04) with a RAID 10 array (4 disks), and the RAID 10 array is partitioned as one big LVM. I have a logical volume on that which is 40GB that holds the root file system. The ...
3
votes
1answer
1k views

Optimizing ext2 filesystem for use on LVM + RAID device? Stride, stripe-width, LVM IO size considerations

I'm building a new database server and am trying to make sure I have the setup as correct as possible. The database storage is 22x 15.7k RPM Western Digital SAS drives in RAID10, in an external SAS ...
0
votes
4answers
1k views

How to (hardware) RAID 10 on Ubuntu 10.04 LTS with 4 drives and motherboard with RAID contoller

I have 4 500GB hard drives. I set up a RAID 10 in BIOS, much like shown here: http://www.supermicro.com/manuals/other/RAID_SATA_ESB2.pdf Then I followed these instructions: ...
3
votes
4answers
878 views

Running swap on RAID10 or RAID5?

In follow-up to this previous question (and it's excellent answer), I am curious to know if running swap on a RAID5 might not be better than on a RAID10. My thinking is that you might lose a bit on ...
4
votes
1answer
924 views

RAIDZ vs RAID1+0

Hi guys I just got 4 SSDs for my FreeNAS box. This server is only used to serve a single iSCSI extent to my Citrix XenServer pool and was wondering if I should setup them up in a RAIDZ or a RAID 1+0 ...
4
votes
2answers
2k views

Would you recommend mdadm raid10 for EC2?

I read a blog article somewhere that RAID10 on EC2 cuts down performance by half compared to RAID0. But when you have critical database data on the volumes, how else do you prevent data loss in case ...
3
votes
3answers
510 views

What are the advantages and disadvantages of constructing an mdam array from whole disks vs. partitions?

Let's say I've got six identical drives and I'm going to use them all in a RAID10,f2 array constructed using mdadm. I've always put a single partition on each disk and constructed the array from ...
0
votes
1answer
161 views

Switching from Raid1 to Raid10

we are running a Dell Server with a PERC5i Raid card using a Raid1 setup. Now we are hitting a performance problem with our harddrive performance and think about switching to Raid10. Which steps are ...
0
votes
1answer
410 views

RAID 10 software from the install with Centos 5.5

I'm downloading right now the Centos 5 DVD. Is there any way to install it on 4 HDs (2Tb)? Thank you a lot!
2
votes
5answers
571 views

Which is the best RAID between RAID 10 and 0+1?

Could anyone tell me which RAID would be the best between 10 and 01, and why? Thanks for your help. EDIT: I didt't want to know what's the best RAID ever... Otherwise I'd ask: "Why is NetApp RAID-DP ...
7
votes
1answer
13k views

Can Windows 7 do software RAID 10 (1+0)

Can Windows 7 do software RAID 10 (or RAID 1+0 depending on terminology)? There appears to be a lack of information about software RAID for Microsoft Windows products. Even a search of the ...
8
votes
2answers
1k views

Linux Software Raid 10 hung after 1 drive failed, mdadm will not let me force remove the faulty device

I have a Linux software raid 10 setup consisting of 5 RAID 1s (Two drives per mirrored setup) and a RAID 0 across all 5 RAID 1 pairs. To test that none of the drives were going to fail quickly under ...
5
votes
7answers
8k views

Raid 5 with hot spare or RAID 10 with no hot spare?

Yes, this is on of those "do my job for me" questions, have some pity:) I'm at the limit for what I can do with the number of hard drives in a server without spending a substantial amount of money. ...