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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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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Apr 28, 2008
On a standard CentOS4 installation do mysql databases get stored in the /var volume or is it /home? Does that mean I need to ask the dedicated server host to create /var really big if I'm expecting my MySQL database to get huge? Or is it better to reinstall MySQL so it puts the databases on the largest volume?
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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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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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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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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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Mar 10, 2009
My host has a limit of 1000 emails/hour on shared hosting, so I'm thinking of getting VPS.
I currently send out 5000 emails/day with an average 10kb size (using Mailman).
I'm planning on switching to sympa. I'm wondering what kind of vps specs I'd need to send 20,000 emails/day? 50,000? 100,000?
Or another way of putting it: how much volume could I handle on a VPS with 256mb ram?
How much does the email size affect matters? (I'm wondering if attachments are resource intensive).
What is more likely to be the limiting factor: memory or cpu?
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Jun 11, 2008
does anyone know if this is safe, i mean when i ordered the server they advertised 500 gb sataII but i never knew that they actually come with 2 hdd and somehow combined into one hdd like raid0
i got one 320gb hdd and second 160 gb which together it count as 500? sounds like a joke to me but anyway They installed this Logical Volume Manager and wondering if its safe or if its same as raid0?
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May 21, 2008
I need a relatively cheapy box to serve my thumbnails for my site. Gotta have around 2TB.
I really don't need anything fancy as its just going to serve thumbnails for my main site which sits at PacificRack.
Provider should be in USA and port speed would be 100mbps.
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Mar 22, 2008
In your opinion, what are the "best" providers of dedicated servers - with a volume/reseller discount? I do not want to go through a reseller or third party myself, so I'm looking for "tier 1" providers.
As a company, we're looking at moving into the hosting industry, as well as consolidating our development clients onto our own hosting. Currently, they're spread out over tens (if not hundreds) of different hosts. This is an absolute nightmare maintenance wise. Previously, our customers chose the hosting - we merely managed their application/service.
Our client base is growing exponentionally, as we are now expanding beyond local/national businesses. We're intending to target the global SME market, as well as going after new start-ups.
Our current estimates put us with needing roughly 12 - 24 (depending on specification) servers to begin with, with our server base doubling roughly every 3 - 4 months.
We're looking at sourcing from more than one supplier, so it would be nice to get some recommendations of providers in Europe, the United Kingdom, America - and various other locations. Providers with a trial option would be nice, so we don't have to drop a "bomb" to begin with, only to be burned in the future.
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Jul 6, 2009
I'm looking at a project that would need to be located in Panama for server co-location.
It will be very bandwidth intensive, requiring 100 megabits to start and moving up from there. Going with a slightly more "value" oriented provider provided there's a backup (even lower bandwidth) available would be an option, as this application would tolerate limited periods of reduced bandwidth.
Can anybody point me in the direction of some data centers that might be worth looking at? Are there any bandwidth providers down there with a real value focus?
Right now, the best I've seen is $99/megabit from [url] I'm expecting bandwidth to cost more down in Panama, but I'd really like to push this number lower.
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Apr 8, 2015
My Centos server running Plesk12 is running scheduled backups every sunday 3AM.
The backup is configured so that it's created as a multivolume backup with a volume size of 2047MB.
The backup is placed on my Personal FTP repo (another plesk12 server mounted with big storage).
The backup content is configured to backup server config and content (all).
The problem I have is when the backup is running I can see that it creates the volumes and stores it locally. After it send all the volumes the the external FTP repo it will delete the local (tmp) data. See my attached screenshot for storage health during backup.
Is this behaviour normal? This way we can never run a backup to an external FTP repo when our server passed 50% storage. Is it not normal to:
- Create a volume
- Send it to FTP repo
- Delete volume locally
- Repeat until done
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Mar 24, 2008
Is Motherboard RAID as good as a dedicated PCI-E card? I am guessing a dedicated card is the best option, though costs more.
We are looking at buying a barebones server from Supermicro. It features an onboard RAID controller which supports RAID 0, 1, 5 & 10 - but for some strange reason it will only support RAID 5 if you use Windows. Here is a link to the page detailing the RAID features.
[url]
We are going to be running Linux, CentOS 5.1, so we will only have the choice of RAID 0, 1 or 10. This isn't an issue, as having RAID 10 on 4x SAS (15k) drives will be fine for speed and stability. What is an issue is would this RAID controller be as fast or reliable compared to a dedicated PCI-E card? If it can only use RAID 5 in windows, does that suggest this controller is too reliant on software? It would be a nightmare to suffer downtime and data loss because the controller couldn't hack it during a drive failure, or one day it decided to bugger up the array when rebooting.
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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Sep 17, 2009
I could try the Software-RAID 5 of the EQ9 Server of Hetzner.
Does anyone here has experiences, how fast a hardware raid 5 compared against the software-Raid 5 is?
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
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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Jul 8, 2007
I am in a somewhat complicated situation... I wanted to order a custom server with hardware 3Ware RAID controller but after over a month of waiting I was told the HW RAID controller, as well as any other 3Ware controller they tried, does not work with the motherboard used in the server from Fujitsu-Siemens and that they simply got a reply from FS that the controller is not certified to work with their motherboard.
So although I'd prefer a HW raid, I am forced to either choose a different webhost or setup a software RAID. The problem is, I haven't done that before and am somewhat moderately...scared
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.
How do I do that? The big problem I see is that LILO or GRUB can't boot from a software RAID-5/10 so I will have to mount the /boot partition elsewhere. It's probably terribly simple...if you have done it before which I have not. I have read some articles on how to setup a RAID-5/10 with mdadm (e.g. [url] ) but they usually do not talk about how to setup the boot partition. Should it be setup as a small sized (100-200MB) RAID-1 partition spread over all of the drives in the otherwise RAID-10 array?
What about swap? Should I create a 4-8GB (I plan to upgrade the server RAM to 4GB in near future) RAID-1 swap partition on each of the disks or swap to a file on the main RAID-10 partitions. The second sounds simpler but what about performance? Is swapping to a file on RAID-10 array a bad idea, performance wise?
Is it possible to grow a RAID-10 array in a way similar to growing a RAID-5 array with mdadm (using two extra drives instead of one of course)? mdadm doesn't actually even mention RAID-10 despite it does support it without having to create RAID-0 on top of RAID-1 pairs if the support is in kernel, from what I know.
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Feb 25, 2009
How often do RAID arrays break? Is it worth having RAID if a servers hard drive goes down? I was thinking it may just be a better option to just have a backup drive mounted to my system and in the even of a system failure just pop in a new hard drive, reload the OS, and then reload all my backups?
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May 20, 2009
I have a new server and it is rather slow during raid 1 recovery after system installed
CPU: Intel Core2Duo E5200 Dual Core, 2.5Ghz, 2MB Cache, 800Mhz FSB
Memory: 4GB DDR RAM
Hard Disk 1: 500GB SATA-2 16MB Cache
Hard Disk 2: 500GB SATA-2 16MB Cache
root@server [~]# cat /proc/mdstat
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
the sync speed is just 3.4Mb/second and the total hours needs to be more than 40 hours
Also the server load is very high (nobody uses it)
root@server [~]# top
top - 07:00:14 up 16:55, 1 user, load average: 1.88, 1.41, 1.34
Tasks: 120 total, 1 running, 119 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 4148632k total, 747768k used, 3400864k free, 17508k buffers
Swap: 5421928k total, 0k used, 5421928k free, 569252k cached
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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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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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Mar 24, 2009
MY server configure our drives with RAID-1.
How can I check it my server configure with 3ware or software raid ?
Also please advise me how can I monitor raid configuration that my raid is working fine or no ?
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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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May 23, 2007
Just curious what your thoughts are on performance:
2 SCSI Drives 10k w/RAID 1
or
4 SATA 10k w/RAID 10
Prices are not too different with 4 drives just being a tad more.
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Jun 5, 2007
how well software raid can perform and how it compares to hardware raid. How does software raid actually work and is it worth it?
How should I look at be setting up software raid if I was going to? Would you recommend just to use hardware raid instead?
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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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Nov 3, 2009
Are there any significant difference between 4 15K SAS HD in RAID 10 versus 8 7.2K SATAII HD in RAID 10? I have the same question for 2 15K SAS HD in RAID 1 versus 4 7.2K SATAII HD in RAID 10.
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Apr 19, 2009
I'm currently using 4 x 15K SAS raid 10 for a mysql server for a pretty busy forum, it has no I/O problem.
Now i'm going to migrate to a new server that i'm building soon, I have choice of:
2 x Intel X25-E SSD RAID 1
or
4 x 15K Fujitsu SAS RAID 10
will be using Adaptec 2405 RAID card.
The OS will be installed on a seperate hard drive.
If I go with the SAS setup, will be about $200 cheaper.
Which one do you think is better for Mysql performance?
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May 10, 2009
I have room for 4 more hard drives on my home server. My original goal was to go raid 10 but I've been thinking, raid 5 can support 4 drives and give more capacity. Which one would have better performance as software (md) raid? I'm thinking raid 10 might actually have bad performance as software raid, vs hardware, compared to raid 5. Would raid 5 with 4 drives be better for my case?
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