Good Raid Cards For Ubuntu
May 20, 2007With Ubuntu getting more and more popular, anyone knows what are the raid cards that support Ubuntu?
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Raid Cards
Dec 9, 2008i have several servers here but only basic knowledge about raid
My understanding of raid is like this
I have a server with 4 disk on it and if i put it in raid 1 and want to install an OS i can only see 2 of the disks right? (thats how it works on my ibm server)
But with my other servers if i put them in raid 1 and want to install OS i can still see all 4 disks thats not right is it?
anyone that can recommend a pci raid card for 4 sata2 disks?
Hardware RAID: Is Motherboard RAID As Good As A Dedicated PCI-E Card
Mar 24, 2008Is 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?
400GB Hard Disk Drives In RAID 0, RAID 5 And RAID 10 Arrays: Performance Analysis
Mar 7, 2007Quote:
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]
Ubuntu VPN Tunnel Between 2 Ubuntu Servers
Dec 29, 2007way to create a VPN tunnel between two ubuntu servers?
Both will be in seperate datacentres but I'd like a secure tunnel so I can setup jobs to backup to one another.
This has to be done on the server level and cannot be done at the router/firewall as I do not have access to this kit.
Credit Cards...
Apr 17, 2008Not sure on industry standard here, but I am now curious about this issue.
I placed an order with a company, paid for a setup, first month etc. On receiving the order, I was given the wrong product. Which was fixed for me within a few days. I was happy to even pay for this which the host declined.
Fast forward a week or so. Still in the first month, and issues are still not resolved.
I've now removed credit card information from the billing system (yes I know, shouldn't do it) with good reason. I expected to have to pay another month, and that was fine.
Anyway, month ends and I am charged on a credit card that was removed from the billing system. When confronted about it, I was told standard practice. I think this is highly unethical to hold details after they had been removed.
Is this indeed standard practice in this industry? Do a majority of other hosts do the same thing?
Now again, I am only to happy to pay another month, just not from a credit that was removed, which is why it was removed. I would've sent a check, or done a deposit. I do understand that fraud, etc is very high in this industry. I have a host or two not give me service because of the email address I used during sign up, but when changed, I received service.
NIC Cards Upgrade On 2 Servers
Feb 2, 2007The issue we have is that server1 (web) has the load very high, compared to server2 (mysql). Sever2 stays at 0.5 during peak time.
I must mention that we have very heavy traffic hits only for 30min/day, then things calm down.
I simple diagram would be:
[USERS] <= NIC1 => [SERVER1 WEB] <= NIC2 => [SERVER2 MYSQL]
So I think we can install a load balancer and upgrade the NIC cards, in order to solve this problem.
What I thought is this:
In server1 (web) install 2 NICs, one facing the users and one facing the server2 (mysql).
Currently we have a 100MB NIC card into each server.
The 95th is way to high at peak time, over 500MB so I was thinking on installing a 1GB NIC facing the server2 (mysql).
My question is:
What is the best way to install a second NIC into an existing configuration?
Do I need a Cisco 2970 switch?
Example:
[USERS] <= NIC1 | NIC3 => [SERVER1 WEB] <= NIC2 => [SERVER2 MYSQL]
Redundant Network Cards
Aug 29, 2007to setup a Windows server that can support the failure of the switch that comes before it in the network diagram. The idea would be that if the 15A circuit the switch was on failed, or the switch just died, the server would still be online.
I already have two switches in spanning tree just before the server. Is there a way to assign a single IP to the server on both its network cards and connect each card to a different (spanning tree'd) switch?
Using 2 Separate Network Cards
Nov 8, 2007I am setting up an internal network for management only. So, assign an IP for the second NIC, and activate it, but it seems not working. I have tried this
#ifconfig eth1 192.168.2.14 netmask 255.255.255.0 broadcast 192.168.2.255
#ifconfig eth1 up
checking dmesg, it shows the NIC is up
# dmesg
ADDRCONF(NETDEV_UP): eth1: link is not ready
tg3: eth1: Link is up at 100 Mbps, full duplex.
tg3: eth1: Flow control is off for TX and off for RX.
checking routing table seeing the 192.168.2.x routed through eth1
# route -e
192.168.2.0 * 255.255.255.0 U 0 0 0 eth1
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
default reserve1.somename 0.0.0.0 UG 0 0 0 eth0
Repeat those steps for other boxes, but when pinging, all return errors
# ping 192.168.2.20
PING 192.168.2.20 (192.168.2.20) 56(84) bytes of data.
From 192.168.2.14 icmp_seq=1 Destination Host Unreachable
From 192.168.2.14 icmp_seq=2 Destination Host Unreachable
From 192.168.2.14 icmp_seq=3 Destination Host Unreachable
Perc 4 DC Cards In Sun V20Z Servers
Jun 17, 2008Will the Dell-made PERC 4 DC (or SC) RAID cards work in Sub v20z servers?
The Sun v20z specs :
[url]
From what I gather, it should in theory work, as they are both PCI-X and Ultra320 SCSI ... right?
If they won't work, can anyone recommend any raid cards that will?
Central Management For Servers With IPMI Cards?
Apr 13, 2009We've been investigating software and appliances that would allow us a central, web based login to manage access and users to all the servers with IPMI cards. Does anyone use anything other than appliances from avocent or raritan?
View 2 Replies View RelatedIPMI Management Cards, Setting IP Address
Apr 3, 2007I have a question maybe someone can help with. Is it possible to set the IP address on a IPMI card before a system ships? That way when the customer gets it, it already has the IP address set to whatever was agreed on and they can log right in using that IP address?
The card is a supermicro Supermicro AOC-SIMLC
How Can I Setup Dual NIC Cards For Extra Redundancy
Jan 10, 2007I have linux dedicated server and like to setup dual NIC cards for extra redundancy.. in case one NIC card fails.
I have no idea how I can set this up..how can I do this? I understand at least I need swtich.. and?
Any Web Hosts That Offer 3D Graphics Cards In Their Hosted Servers
Aug 3, 2008I was wondering if there's any web hosts that offer 3D graphics cards in their hosted dedicated servers? they don't have to be that great of 3D graphics cards just better graphics than the normal video cards that they usually put in them?
View 14 Replies View RelatedAny Experiences With Software-Raid 5 Vs Hardware-Raid 5? (e.g. Hetzner EQ9)
Sep 17, 2009I 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.
Whats The Best For Server With SATA Raid 1 And SCSI Raid 10
Jan 14, 2008So 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
How To Setup Software RAID-10 On Linux With /boot On RAID-1
Jul 8, 2007I 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.
Worth Having RAID 1 If Raid Arrays Break
Feb 25, 2009How 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?
View 14 Replies View RelatedSoftware Raid 1 - Rather Slow During Raid 1 Recovery
May 20, 2009I 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
RAID 5 Vs RAID 10 In Shared Hosting Server
Oct 22, 2009I 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?
Turn Non Raid Into Raid On Live Server
Dec 23, 2008Is 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.
View 12 Replies View RelatedRead Raid-disk On Non-raid System
May 22, 2008I 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
3ware RAID Or Software RAID
Mar 24, 2009MY 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 ?
RAID Or Not To RAID: Trying To Decide On A New Server
Jul 11, 2008I'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?
Raid 1 SCSI Or Raid 10 SATA 10k
May 23, 2007Just 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.
Software Raid Vs. Hardware Raid
Jun 5, 2007how 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?
RAID 10 Or RAID 5 With Online Backup
Dec 10, 2007Which 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
List Of Good Hosters With Good TELEPHONE Tech Support
May 6, 2008I'd like to start an ongoing thread here listing the 'Good Hosters with Good TELEPHONE tech support'. In other words, out of the 1,000s of host companies, this may cut it down to less than a dozen.
( And for all you Hosters out there who really want your company to grow, and want to know how, - it's easy: just read here.)
Good telephone support is the #1 ultimate requirement, because:
-It's a lot faster and easier for both the user and the host company, because you can state and answer all questions and clarifications on the spot, you don't need to continually pass new emails with new questions and clarifications, back and forth for days on end, until the issue is solved. It saves tech time and user's time. And saves a lot of nerves.
- It's the best way to sort the good guys from the bad. A bad company isn't going to bother to answer the phone, - or will make you wait way too long, - because they are likely getting endless complaints. The good guys are always ready to answer the phones, with a friendly voice, - because they really WANT to please the customer.
- If a company can't be bothered to pick up the phone, we can't be bothered to even consider them. They're a joke, and so won't be listed here on this thread. (So, before adding or listing any Hosters here, please verfify that they do have Good, quick, friendly, telephone support,; ideally 24/7, but 9am to 10pm might be acceptable, if it was supplemented by some emergency contact.
AND:
- Hoster ALSO needs good EMAIL support (and preferably, Chat online, extended hour availability). (I spend a lot of time overseas). It sems all emails should get a non-automated response within about an hour, - and then support should jump on fixing any problem.
I only need support a few times a year. To answer some questions, or fix a problem, or do an install. That's lesss than 1 hour total, so any company paying maybe $18/hour tech support should be able to handle this. It IS reasonable to charge a custm for extended calls, beyond say, 90minutes a year, IF you don't count the 80%? Of times an issue is the Hoster;s fault of stmg gone wrong, and don't count the 'hold' times.
ALSO IMPORTANT:
- Uptime
- site Speeds
- Monthly plans, no contract (Only a dishonest host will try to force you into a contract, where they can then ignore you.)
- Reasonable price. (? Maybe $12 to $18/month for a basic business site. We don't need massive bandwitdths, - we all know that's an overselling scam, and can't ever be delivered.)
- a good upgrade plan of bigger options. Maybe even VPS.
- Dedicated IP, and availbility of SSL
-PHP 5, mysql, phpMyAdmin, etc
- cPanel ( Some Hosts are using problematic panels, like Hsphere, which are slow to load, slow in operation, require many more clicks, have too many options, spread apart on many separate pages. Time is money, and this really slows down the ability of a small business to manage his own site in effective time. For example, one WHT user wrote somewhere: "I don't feel that HSphere's interface is nice at all, although I have worked with cPanel and DA all my life... I just found it to include un-necessary features or split features up in to different hard to find pages, such as backups - mysql backups you had to find on a completely different page than file backups, and then there were options to have it in the home directory or server-end backup, in which then you had to wait a good 10 minutes before it was ready. cPanel, just hit backup and hit download and instantly it does everything you need...".
I have used several hosters. Currently on Aplus.net and Godad, which have phone support, and mediocre service.
My LIST So Far:
- Liquidweb: a very impressive company with good, 24 hour support. But to get dedicated IP, you need to go with their $25/month plan. Yikes!
- NewIdeaHosting.com. A very small company. My call was returned, and the owner chatted with me for an hour on the phone! Plans have small bandwidth, but promises No overselling, and personalized attention. Extra $5 for dedi IP. He specializes in Small business sites, and small eCommerce sites. He has only 250 accounts, on 3 servers. He rents servers from the Equinox data center of Chicago. Seems exceptionaly honest.
- MegaHosters. Excellent phone support and WHT reviews. But company was taken over by another company, and so may well go downhill in future. Another problem: uses Hsphere.
- Steadfast. Has a good rep on WHT, and seems impressive. Tech answered the phone immediately, but they say they prefer emails. Sales phone has limited hours. Good price on $20 SSL. But, uses Hshhere.
- JodoHost 24 hour phone. But, uses Hsphere. An Indian company with office in Florida, and good rep. I like the idea of outsourcing phone support, if it makes it more available and affordable. But, the accent on the phone was very hard for me to understand, so maybe this might not work.....
- Hostgator. Yes, it's a big overseller, but seems to get good reviews/results anyway, and good phone support.
- ? ThePrimeHost ?? Mostly good WHT reviews; some dissenters. Site says 24hour phone, but when I called on several nights, no one ever answered...
- Can anyone add to this list? Please list only hosts that meet the above minimum requirements of phone support, etc. Especially useful is hosters you've tried.
TO AVOID:
- Avoid Arvixe. I had a horrid experience with them, here: [WHT forum]:/showthread.php?p=5097822#post5097822
- Avoid WebHostingBuzz. This company never returned my phone msessage inquiries.
4 15K SAS RAID 10 Vs. 8 7.2K SATAII RAID 10
Nov 3, 2009Are 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.
View 13 Replies View Related2 X SSD Raid 1 Or 4 X SAS Raid 10 For Mysql
Apr 19, 2009I'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?
Raid 5 Vs Raid 10 (4 Drives)
May 10, 2009I 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?
View 10 Replies View Related