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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475 views

RAID 1 mirror disk failure detection

In the BIOS of an ASUS motherboard I've set up a RAID 1 mirror out of two hard drives. All is working fine at present. I have two OS installed on the machine: Windows Server 2008 R2 and Windows 7. My ...
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1answer
262 views

configuration for max read throughput on ssd: pcie vs sata vs raid

I'm looking to configure a storage setup, using ssd's, that will deliver the fastest read throughput on large (2+ GB) files on a 24 core (12 physical core) system. The data is static for the most ...
1
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1answer
536 views

3ware 9650SE-2LP “sync” after a drive failure

I have a 3ware 9650SE-2LP card that was set up to mirror two 1 TB disks (let's call them Disk A and Disk B). A couple of months or so ago the array stopped working (gave me an error at boot-up saying ...
3
votes
1answer
2k views

Do I need to trim my SSD? How?

I have been using a pair of Intel 320 in RAID 1 on my busy Ubuntu server for about 4 month. While the disk usage never reached 50% of the capacity, but I FEEL that the server has become less ...
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2answers
3k views

Getting Windows Server 2008 R2 to Recognize Large Volume

I've got a server with 16 1TB SATA drives in it. It was set as a single RAID5 volume. Unfortunately, Windows was showing two unallocated volumes during the windows setup, one as 2TB, and then the ...
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2answers
176 views

Backup Server RAID Partition

Recently bought a server with 16 1TB disks. We're going to use this for a backup to disk solution. Is there any reason why I'd want to partition the array in any specific manner? I was basically just ...
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1answer
59 views

A redundant standalone backup solution for a small amont of information

Currently a software vendor suggests storing backups of their software's database (that includes confidential and private information) on flash drives on a regular basis. Having had my share of pain ...
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2answers
12k views

HP ProLiant ML350 G6: Does the RAID rebuild automatically?

One of SAS hard disks of this ML350 died. We're buying a new one and I wanted to ask if I can just take out the faulty one and insert the new one with the server on to let it rebuild the raid or I'm ...
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2answers
405 views

Does Windows Server 2008 software RAID-5 protect against bad clusters?

I have tested rebuilding a Windows Server 2008 RAID-5 after a whole disk fails, and this works pretty well. It's a bit harder to test a few clusters going bad. Will Windows detect this, correct for ...
5
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1answer
234 views

Recovering linux software RAID array without removing it's items

I have linux software raid (RAID10), md2 : active raid10 sda6[4](F) sdd5[3] sdc5[2] sdb6[1] 390620160 blocks 64K chunks 2 near-copies [4/3] [_UUU] which has degraded state. Can i start recovery ...
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2answers
2k views

Ubuntu EC2 Raid0 Ephemeral — SSH connection after reboot

First, I launch a fresh large instance using the Elestic AMI ami-c162a9a8. Initially, I run: df -h /dev/xvda1 9.9G 814M 8.6G 9% / udev 3.7G 4.0K 3.7G 1% /dev ...
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1answer
225 views

Can I use SATA discs as a hot swap discs

My server supports hardware RAID and it can use SATA drives. I wonder does it depend on Server or on a Discs to know, if they support hot swapping? And rebuilding while working? I know that SAS ...
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2answers
2k views

Can I use an SSD as Cache to a NAS?

There is a NAS with Raid 10 that holds resources. At a time, around 24 machines try to access the same resource (3d rendering in a render farm). Although the network is 1Gbps and NAS is fast, the ...
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2answers
594 views

Dead software RAID CentOS 6

I have a RAID 5 array (with LVM on top) on a CentOS 6 box. The array itself is an LSI StorageTek disk shelf with 14 drives connected to the server with a fibre channel cable. After rebooting the ...
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8answers
2k views

RAID layout for terminal server usage - what are my options?

I'm finishing off a Terminal Services solution where I have two identical Dell PowerEdge R710 servers running Hyper-V which will both be connected to a Dell MD3000 DAS via SAS HBA. The MD3000 will ...
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votes
1answer
274 views

ATTO SAS-attached RAID 5 array performance issues on Server 2003

We have an ATTO R380 SAS RAID controller in a Windows Server 2003 HP DL-160 server with 8 700GB Seagate 7200.12 drives. It's configured as a RAID 5 array. ATTO Config says all drives are healthy and ...
2
votes
1answer
578 views

Does my server have software RAID 1 set up?

I recently got my dedicated server it has 2x 1TB HDD's, so I asked for software RAID 1 on set-up and my provider asured that server have RAID 1 (software). I tought that if I will run RAID 1, I will ...
135
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2answers
25k views

What are the different widely used RAID levels and when should I consider them?

This is a Canonical Question about RAID levels. What are: the RAID levels typically used (including the RAID-Z family)? deployments are they commonly found in? benefits and pitfalls of each? ...
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1answer
80 views

Raid group on a p2000g3 iscsi

I have to set up an hypervR2 cluster (2nodes) and a san storage (hp p2000g3 iscsi) with 12 disks (300 GO, 10k SAS) The p2000 has 2 controllers. What is the best ? ONe big raid group (raid10) with the ...
2
votes
1answer
15k views

Which RAID caching policy to use?

I'm in the process of setting up a server. Dell PE R510, 6 450GB HD. It came with all drives RAID 5'd, I'm wanting to wipe the configuration and set 0 and 1 as RAID 1, then 2-5 as RAID 5. When I go ...
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votes
2answers
45k views

Dell PowerEdge - Add new disk to an existing RAID 5 array

I have a Dell PowerEdge with a RAID 5 array of 3 disks, and I want to add a fourth disk to it to expand the capacity of the volume. I don't want to reinitialize the whole RAID 5, because I want to ...
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1answer
262 views

raid boot error

in boot.log /dev/md1: clean, 320806/58155008 files, 91390310/232603728 blocks /dev/md0 was not cleanly unmounted, check forced. /dev/md0: 32/24384 files (9.4% non-contiguous), 19957/97536 blocks ...
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3answers
693 views

Getting more database performance - postgresql

There is a django "web application" (from hell) we are hosting on a dedicated server. After some benchmarking I found that the "Application" is amazingly bad at database operations (refactoring is not ...
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1answer
85 views

MS SQL Hardware Configuration

About to order a replacement mirrored database pair to drive our multi-user web applications and looking for some guidance on some aspects. I have read various feedback on other posts but finding it ...
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3answers
619 views

Optimizing Disk I/O & RAID on Windows SQL Server 2005

I've been monitoring our SQL server for a while, and have noticed that I/O hits 100% every so often using Task Manager and Perfmon. I have normally been able to correlate this spike with SUSPENDED ...
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1answer
487 views

Problems with RAID1 array being recognised

I have put a new RAID card (UCS-51) into my Dell Precision T5400. I have connected this to 2 x 1TB SATA disks. I have configured a mirror array in the RAID bios. The array shows when I boot ...
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votes
6answers
1k views

Server RAID died. How would you recover data from its drives?

We have 9 machines at the moment. One of them had an electrical fault which fried the board but the drives seem ok. I'm not entirely sure how I would even attempt to recover data from it. The drives ...
2
votes
2answers
1k views

Using the spare drive in an HP Proliant DL380 G4

I have an HP Proliant DL380 G4 with a Smart Array 6i controller and 6 hard drives. 5 of the drives are configured as a RAID 5 array, and 1 is designated as a hot spare. The server has just given me a ...
2
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1answer
3k views

Rebuilding array on 3ware 9690SA-8I

TL;DR version RAID10 array working fine Reboot server as part of maintenance Array inoperable (no access whatsoever) Controller logs say a single drive is bad Remove drive & test - no bad ...
4
votes
6answers
8k views

MegaRAID JBOD substitute

It seems that certain MegaRAID chips don't support JBOD (unfortunately). I've read online that to make these controllers act as a pass-through, I should configure the disks in RAID0. What RAID0 ...
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3answers
229 views

Linux software raid robustness

I have a 4 disk 5TB raid5 setup where a disk is showing signs of going down the drain. It is reporting media errors and from dmesg I can see that several read errors are corrected. smartctl does ...
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2answers
165 views

NAS Hard drive configuration advice?

Just got a 4 bay NAS. I want to set it up as optimal as possible. I was thinking of getting 3 x 1TB hard drives and setting up as RAID 5. The disk usage will probably be around 1TB max but there is ...
2
votes
1answer
763 views

Adding RAID after Installation of Windows Server 2008

I have an HP Proliant Server 100ML G6 with with Windows Server 2008. Installed. I first installed the system with out enabling the onboard raid controller. So, now windows is install on the first hard ...
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4answers
1k 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 ...
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7answers
4k views

Hot spare or extra parity drive in RAID array?

In a different question about configuring a RAID array, the author is building a RAID array with 8 drives. One answer suggests using 7 drives in RAID 5 with one left over as a hot spare. Since RAID 6 ...
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votes
2answers
2k views

RAID0 (both hardware and md) slower than LVM?

I'm doing some benchmarking of nodes as we build out a distributed filesystem. Since files are going to be distributed and replicated across many nodes, we're using raid0 on the nodes themselves. ...
6
votes
1answer
3k views

I have a 21TB array but only 16TB is visible from Windows

CONTROLLER Raid Controller: 3Ware 9650SE-24M8 Disks: 21 x 1TB RAID5 Stripe 64KB WINDOWS OS: Windows Server 2003 SP2 32x Disk: Dynamic 19557.44GB Volume: Capacity 15832.19GB I guess my array ...
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3answers
725 views

Failed RAID 1 or 5 (mirrored or parity) hard drive replacement requirements

What are the general replacement requirements for a failed RAID 1 (mirrored) or 5 (parity) hard drive? Does the replacement drive have to be exactly the same (1) model and/or (2) size of the original ...
2
votes
1answer
994 views

ESXi from SD card to hard disk on raid system?

My currrent ESXi 4.0.0 system runs from an SD card and has some VMs set up on two 1 TB drives running in a Raid level 1 configuration on a Dell PowerEdge R710. I've been asked to make the system use ...
3
votes
1answer
175 views

Package upgrade on Ubuntu raid server and grub setup issue

I have remote Ubuntu 10.10 server running on raid system. I did package upgrade yesterday night for security reasons. During the upgrade, grub installation screen appeared and asked me which partition ...
7
votes
3answers
17k views

What does 3Ware's tw_cli mean by a “DEGRADED” disk vs “ECC-ERROR”?

I've got a sad RAID array on a 3ware 9650SE-16ML card. What I can't tell is if I've just suffered a double-disk failure (bummer!) or if I'm reading this wrong. The relavent output of /c0 show all ...
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votes
1answer
795 views

What server setup for a small web development company? [closed]

I co-own a company with a friend of mine and we have decided to buy a new server to support our business (our current server is an Asus EEE Box, working great but too limited :) ). I should mention ...
0
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2answers
846 views

How to calculate RAID Parity Bit? [closed]

How do I calculate the parity bit? In a RAID 3 odd parity with 5 disks. How do I get the parity bit? The answer was But I want to know how is this calculated?
3
votes
1answer
211 views

Linux implementation similar to Adaptec Intelligent Hybrid RAID?

I could explain it in my bad english, but looking at this page is the fastest way: http://www.adaptec.com/en-us/_common/hybrid-raid/ Do you know of any linux implementation for this outstanding ...
0
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1answer
344 views

Redundancy on the Freenas install itself?

I'm wondering what kind of redundancy I can put in place for the Freenas install itself. If the drive that Freenas is installed on fails, does that mean all my raid volumes are gone since its all ...
8
votes
2answers
15k views

Megacli is killing me, any help appreciated

I run a server with 2 drives in raid0 configured through BIOS. I just added 2 more drives using hotplug (the server is dell r610 with RHEL 5.4 64bit) and I would like to configure a separate raid0 ...
4
votes
3answers
12k views

Slow parity initialization of RAID-5 array on HP Smart Array P411 controller

On 29th October 2011, I built a RAID-5 array using 4 x 146.8GB Seagate SAS ST3146855SS drives running at 15k connected to a PowerEdge R515 with HP Smart Array P411 controller running Windows 2008 (so ...
0
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1answer
241 views

Delay before download starts when serving files using nginx

I am currently using nginx to serve downloads off my website. Users sometimes need to wait about 5 seconds before their download starts after clicking a download link. I'm not sure if I need to start ...
2
votes
3answers
1k views

SATA Raid 10 vs SAS Raid 1

I need to setup a small dedi for a few VPS. Obviously the more IO, the merrier. Given these condition, what would you choose? 2 SAS 15k disks in Raid1, or 4 SATA 7.2k in raid 10? Would the answer ...
2
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1answer
892 views

Changing MySQL datadir on active server

I have a server that seems to be setup wrong by previous administrator.. The server has two disks, disk 0 which is the operating system (RAID1 clone) disk 1 which is 3 drives in a RAID5 setup with ...