Storage, Raid, Front-end Servers/ Coraid

Sep 11, 2007

We're currently serving approx. 150mbit of traffic (mainly video files) via 2 round robin'ed front-end servers. The front-end servers are NFS mounting the content blades so we can access all content via dedicated links to each blade, A,B,C like:

mainsite.com/A/files.wmv (blade A)
mainsite.com/B/files.wmv (blade B)
mainsite.com/C/files.wmv (blade C)

We're fed up with this way of structuring our content because of space issues and because we need to go to blade A to get file X.wmv and to blade C for Y.wmv

We're looking for a better solution and we need your help, I have looked at the producs from Coraid, e.g:

[url] look for "Bundle - CLN21 + SR1521"

Would this be a way to do it? it will give us plenty of storage space and if we could buy 2 sets, we could mirror the sets and mount a set to each front end server to have some failover protection? and we could remove the A,B,C areas and have it all under:

projectABC/
X.wmv
Y.wmv (not so important just an easier way for us to keep track of it)

But is Coraid even used for this kinda task or is it a LAN product? Can it keep up with the 150mbit of file requests, 20-400mbit a piece.

Another idea was to simply build 2 sets of raid boxed with a 16channel raid card some some disks and it would give us something similar to the coraid?

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Scalable Raid Storage Storage On A Budget? Also Hdd Reliability Q's

Sep 20, 2007

I'm completely torn on going the absolute budget route vs spending more for something that'll allow easy upgradeability in the future. I basically need lots of space but file sending-- media like mp3s, video, etc.

it'll be raid 5 and I'll need at least 2-3TB initially but the ability to expand would be nice.

option 1:
nice chassis with plenty of hotswap bays with sas expanders
expensive sas raid card

option 2:
cheap chassis to serve "immediate" needs and go with more later.
not sure what I'd use as a card? maybe even onboard?

regarding reliability: I once saw a database of failure rates of different models. raptor was the most reliable of the "desktop" drives. anyone have the link? I'm wondering of the seagate ES drives are worth the extra money vs the non-ES drives. they're supposedely more reliable and the "server versions" of sata drives.

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Mounted RAID Storage - No Access From Apache/php

Apr 25, 2007

I have a problem with my new server's setup. It's using a big RAID storage mounted to the main system. When it comes to shell everything is fine, I have access to the disk and files. Problems rise when I try to access the storage content from my php scripts (running on apache) - "Permission Denied" ...

Anyone knows where might be the problem?

I suppose it's because of using RAID but I'm sure it's doable.. somehow..

When I tried to use CLI mode it looks fine - PHP script can access RAID'ed folders when running like :
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Nov 5, 2009

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I assume it's best just to go with RAID 10 and be safe or?

More importantly for me, what's the best way for these systems to communicate? I.e.

what protocol should be used for the web servers to read the files from the file server?

I once used SSHFS for serving the same static files on a couple of machines from one location... but that's presumabely very slow (at the time wasn't a problem).

All systems will be running CentOS Linux.

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May 28, 2009

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would this be cost effective?

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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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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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Apr 4, 2009

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What kind of hardware firewall do you use?

If not, how do you protect your hardware nodes from attack?

After some research I seem to find most providers do not in fact have any hardware firewalls in front of their VPS hardware nodes. Mostly they say it causes too many problems and tickets due to port blocking, etc... and customers complain about being restricted..

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May 19, 2007

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I have done the following: uninstalled /re installed extensions via whm (same error)

.htaccess is default frontpage's code only, nothing else

/scripts/chownpublichtmls

dns zone propagated fully, correct (today)

.htaccess file:

Code:
# -FrontPage-
IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*
<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName www.domain.com
AuthUserFile /home/user/public_html/_vti_pvt/service.pwd
AuthGroupFile /home/user/public_html/_vti_pvt/service.grp

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Apr 15, 2008

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Why Wndows 2008 Standard Shows Its IIS Front Page Only

Dec 13, 2008

Why Wndows 2008 standard shows its IIS front page only

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Does ISS has some sorts of hidden privileges in Micorosoft which is not surprising

I am about to revert back to Windows 2003 if I can't find a solution to this problem. Or do I have use a certain role for remote access?

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Mar 24, 2008

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[url]

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So that leads me to looking at this card, this looks very good for what we need. Are adaptec a reliable brand? I've seen it advertised for £200, which is a good price.

[url]

This card features RAID 5 and 6, would RAID 6 be better than RAID 10 for redundancy, or is it too slow to bother with? Also it seems to have a battery module available for it, what does this achieve? Cos surely if the power dies the hard drives and motherboard can't run off this little battery, or does it just help the controller stay alive long enough with some hard drive information in its memory if the power goes out during a rebuild?

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The i7-975 should have enough power to compute the redundnacy on the fly, so there would be a minimal impact on performance. But I have no idea.

I want to run the server under ubuntu 8.04 LTS x64.

On it a vitualisation like VMware the IO-Load could get really high.

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Jan 14, 2008

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

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Jul 8, 2007

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I have read a lot of the info about SW RAID on Linux that I could find through Google but there are some questions unanswered still. So I thought that perhaps some of the more knowledgeable WHT members could help me with this problem...

The server specs will be:

Core2Duo E6600 (2.4Ghz), 2GB RAM, 6-8x* 250GB SATA II HDDs, CentOS 4.4 or SuSe, DirectAdmin

* I prefer 8 HDDs (or actually 9) over 6 but I am not sure if their server chassis can hold that many HDDs, I am awaiting answer from them. They don't have any other drives beside the 250GB ones so I am limited to those.

The preferred SW RAID setup is to have everything in RAID 10, except for the /boot partition which has to be on RAID-1 or no RAID I believe, plus one drive as hot spare (that would be the 9th drive). I am quite sure they will not do the setup for me but will give me access to KVM over IP and a Linux image preinstalled on the first HDD so that I'll have a functional system that needs to be upgraded to RAID-10.

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May 20, 2009

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Memory: 4GB DDR RAM
Hard Disk 1: 500GB SATA-2 16MB Cache
Hard Disk 2: 500GB SATA-2 16MB Cache

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Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
256896 blocks [2/2] [UU]

md1 : active raid1 sdb2[1] sda2[0]
2096384 blocks [2/2] [UU]

md2 : active raid1 sdb4[2] sda4[0]
480608448 blocks [2/1] [U_]
[=======>.............] recovery = 36.7% (176477376/480608448) finish=1437.6min speed=3445K/sec

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Also the server load is very high (nobody uses it)

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top - 07:00:14 up 16:55, 1 user, load average: 1.88, 1.41, 1.34
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Oct 22, 2009

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or

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