Why Is RAID 1, Just Use A Backup System/server

Mar 7, 2008

I haven't yet broken into the realms of dedicateds, although I have a decent VPS and am anticipating the need to get a dedi in the future.

Hence I'm wondering briefly why exactly RAID (insert some random number?) is recommended? I know it does something to do preventing hard drive failure, although would an efficient backup system be a decent alternative with regards to cost?

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Read Raid-disk On Non-raid System

May 22, 2008

I want to take some data from a raid-disk (taken from a raid-1 sstem). Put it into a new system already, but this system doesn't have any raid.

When viewing "fdisk -l", it said /dev/sdb doesn't contain valid partition. Is there anyway I can mount it now? I am on CentOS 4 box

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Setting Up RAID System

Mar 31, 2007

I've never loaded Linux onto a RAID array before,

I have an Adaptec 2105S card, with 3 x SCSI HDD's attached, in a RAID5 setup. When I boot the Cent OS Server 4.4 CD, it says I don't have any hard drives attached. I am then prompted to select a device driver, but it does not show up in the list.

The options in the list are:
- Adaptec AACRAID (aacraid)
- Adaptec AHA-152x (aha152x)
- Adaptec AHA-2740, 28xx, 29xx, 39xx (aic7xxx)
- Adaptec Aic79xx SCSI Host Bus Adapter driver (aic79xx)
- Adaptec SAS/SATA Host Bus Adapter driver (adp94xx)

It says if I have a driver disk, hit F2. The problem is that I don't have a driver disk.

The manual tells me to visit [url]for drivers, but it's not offline. When I go to the download section for the card [url]the only *nix option, is SuSE.

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Raid 5 On System Volume

Jun 9, 2007

Ive just bought a Power Edge 2600 and I decided to setup the three disks that came with it as raid 5 (within PERC) and installed Win2003 Std. Works great.

But while browsing one of my MCSA books I read that using a raid 5 configuration on the system / boot volume it is next to useless as it offers no redundancy should a volume fail. (With respect to easily booting it back up should a volume fail)

I'm going to use Raid 1 (again with PERC) across two other drives for my exchange data but I'm worried about my system volume. Is my MS book talking about the OS not been able to rebuild data should a volume fail or is this a general rule for raid 5 setups?

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RAID 10 Or RAID 5 With Online Backup

Dec 10, 2007

Which do you guys recommend of the following?

4x 73GB 15,000rpm SAS drives in a RAID 10

or

4x 73GB 15,000rpm SAS drives in a RAID 5 w/ online backup

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RAID Controller Randomly Dropped Off System

Mar 26, 2007

This problem has happened to me twice on the very same server. I can't seem to figure out what's wrong with it.

My raid controller is Areca 1160 + 1GB Ram + 16xWD4000YS. Initially I had the problem of the disk dropping from the array randomly. I suppose this problem has been fixed since I have upgraded disks firmware according to WDC suggestion.

But there's another problem now. From my observation, the controller is randomly dropped off the system. When this happen, I cannot read/write anything from the disk at all. I can SSH in and able to run Areca CLI tool to see what's going on but only to get the message saying that it cannot find any Areca controller.

My only option is to restart the server and fsck all those 16 disks (not fun). I checked the log on the RAID controller itself, there was no sign of problem at all. No alert, no disk being dropped off the array, no events logged at all.

I'm using CentOS 4.3. Firmware on the RAID controller is 1.41, latest is 1.42. (Stupid me for not upgrading firmware when server crashed.) I plan to take the server down for RAID firmware upgrade soon. I just hoped that it's just problem with the firmware, not the controller or backplane itself.

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Whats The Best For Server With SATA Raid 1 And SCSI Raid 10

Jan 14, 2008

So I've just got a server with 2xSATA raid 1 (OS, cpanel and everything in here) and 4xSCSI raid 10 (clean).

Which one do you guys think will give the best performance:

1. Move mysql only to 4xSCSI raid 10
2. Move mysql and home folder to 4xSCSI raid 10

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400GB Hard Disk Drives In RAID 0, RAID 5 And RAID 10 Arrays: Performance Analysis

Mar 7, 2007

Quote:

Today we are going to conduct a detailed study of RAIDability of contemporary 400GB hard drives on a new level. We will take two "professional" drives from Seagate and Western Digital and four ordinary "desktop" drives for our investigation. The detailed performance analysis and some useful hints on building RAID arrays are in our new detailed article.

[url]

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RAID 5 Vs RAID 10 In Shared Hosting Server

Oct 22, 2009

I am in the process of restructuring the infrastructure on our servers. I am thinking of using either RAID 5 (1 hot spare) vs RAID 10 as my 1U server has 4 HDD tray.

RAID 5 would have better capacity but RAID 10 has better overall performance. Which one do you guys go for a shared hosting server?

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Turn Non Raid Into Raid On Live Server

Dec 23, 2008

Is it possible to turn a non raided setup into Linux software raid, while it is live, and if it's the OS drive? Can you even software raid the OS drive remotely? I've been thinking about doing it for the redundancy (and possible slight performance boost for reads, but doing it more for redundancy). I'm using CentOS.

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Whole System Backup

Aug 26, 2007

I just spent over 10 hours on my node configuration (debian etch). I have installed a lot of stuff, made raid1 array, control panel, some tools, rules etc etc etc.

I dont want to see that some day something crash - and I will must start over with everything.

What you guys suggest as backup method, maybe some how-to backup WHOLE system with all files, raid configuration etc.

I dont need incremental backups at all - I just want to save/backup current system, and maybe restore if something bad would happen.

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RAID For Backup Servers

Oct 22, 2008

What configuration would be best for a backup server:

2 x 1000gb SATA II RAID 1 - $150

3 x 500gb SATA II RAID 5 - $110

4 x 500gb SATA II RAID 10 - $140

Reliability and performance wise, which would be more suitable for a R1Soft backup server? Best bang for the buck?

I didn't find this being discussed so I thought I should ask, since hardware gurus would know better than me.

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Should We Have Raid 1 Or Should We Have A Backup Drive

Oct 29, 2007

We are limited with a maximum of 2 drives per server, with a maximum of 750gb drives.

We are thinking of going with 2 500gb hard drives. However the question is, should we use the Secondary drive with Raid 1 and let our VPS clients worry about their own backups or should we instead just use the secondary drive as a backup drive and backup each VPS nightly?

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Restore Backup After Reload System

Jul 14, 2008

how i can restore backup after reload system

this is my partition

Filesystem 1M-blocks Used Available Use% Mounted on
/dev/sda6 1984 254 1628 14% /
/dev/sda8 172669 6405 157353 4% /home
/dev/sda3 24217 2005 20962 9% /usr
/dev/sda2 29057 307 27250 2% /var
/dev/sda1 99 16 78 17% /boot
/dev/sda7 996 39 906 5% /tmp
tmpfs 490 0 490 0% /dev/shm
/dev/sdb1 99 14 81 15% /root/old
/dev/sdb2 20158 17498 1637 92% /root/old/home
/dev/sdb6 2016 37 1877 2% /root/old/tmp
/dev/sdb8 156330 137402 10988 93% /root/old/home-latest

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RAID Or Not To RAID: Trying To Decide On A New Server

Jul 11, 2008

I've been talking to the Planet about trading in my four and a half year old "SuperCeleron" (from the old ServerMatrix days) Celeron 2.4 GHz system for something new. As part of their current promotions, I've configured a system that looks decent:

Xeon 3040, 1 gig of RAM, 2x250GB hard disks, RHEL 5, cPanel+Fantastico, and 10 ips for $162.

Not too bad. I could bump up the ram to 2 gb for, I think, $12 more, which I'm thinking about and wouldn't mind some thoughts on. But, the thing that has me really confused is RAID. I like the idea of doing a RAID 1 setup with those two hard disks. But, the Planet wants $40/month for a RAID controller to do it. I really don't want to go over $200 a month!

Any thoughts on alternative redundancy strategies that might avoid that cost? Software RAID does not seem to be offered by the Planet, unless I can figure out how to do it after installation (is that possible?) Better ideas in general on the server?

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Cheapest SATA RAID Battery Backup Solution

Nov 13, 2007

I've recently put together a server in a hurry and overlooked an important aspect - data integrity after power loss. I'm using Linux software RAID-1 with two 150GB WD Raptors but I'm worried that data could be lost due to having write-back cache enabled without a battery backup unit. I would rather not disable the write-back cache for performance reasons.

What is the cheapest way to get a battery backup solution for Linux software RAID? Do I have to use a hardware RAID card or do standalone battery backup units exist that can use existing motherboard SATA ports?

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Plesk 12.x / Windows :: MSSQL - Unable To Backup Database Operating System Error 5

Mar 28, 2015

12.0.18 update #39
Server 2012r2

Logged into my panel today to run a database backup on a site I'm working on to be confronted with the following:

Unable to backup database 'XXXXXXXXXX'
Cannot open backup device 'C:Program Files (x86)ParallelsPleskBackupXXXXXXXXX.co.nzdatabasesXXXXXXXXX-29 est'. Operating system error 5(Access is denied.).
BACKUP DATABASE is terminating abnormally.

(Error code 21)

I'm not sure why permissions would change on their own, I'm also not sure how to fix the permissions error. I get the same error on all databases.

PrivateTemp folder appears to have write permissions for Group MSSQLSERVER

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Plesk 12.x / Linux :: For Security Reason Backup Is Performed On Behalf Of Subscription System User

Aug 24, 2014

I thought this problem was fixed in Plesk 11.5 but I'm still getting the following backup warnings in Plesk 12..."For security reason backup is performed on behalf of subscription system user...."

My phpbb forum creates cache files which have apache ownership and Plesk backup manager gives warnings that it cannot backup the files due to ownership errors.

I have searched for days for a solution without success. If I change the permissions to owner instead of apache the forums don't function correctly.

Is this a Plesk bug that is still evident in Plesk 12?

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