The redundancy tag has no wiki summary.
-1
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1answer
16 views
Server mirroring strategy questions SQL Server replication, MySQL replication, file replication, etc
I'm working as an application developer for a company that I've been with for for some time. The business would like to mirror their existing windows server (server A) to a new server (server B) with ...
2
votes
3answers
70 views
Mirroring an entire machine
What's the most appropriate way to constantly mirror all the settings and data from one Linux machine to another? I have a critical server, which I'd like to have a "hot spare" available for in case ...
4
votes
1answer
69 views
Is Microsoft's “Storage Spaces” just LVM for Windows? [closed]
From initial reading, it looks like Microsoft's forthcoming "Storage Spaces" is an LVM-like tool for Windows.
Is this a correct assessment?
If it's not merely LVM-for-Windows, then what is it, and ...
1
vote
1answer
60 views
How to connect drive array to redundant motherboards?
How should one connect a small storage array, four 3TB SATA drives for now, to two motherboards or controllers as a failover system? This means avoiding adding another single point of failure such as ...
1
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1answer
92 views
Redundant NFS on Amazon EC2
I'm interested in building two fault tolerant/redundant NFS servers with failover at Amazon EC2. I'm familiar with tools/technologies like DRBD, Heartbeat, etc. Does Amazon provide any specific way of ...
1
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0answers
62 views
How to debug/fix a php/apache segmentation fault while using memcache (redundant) for session storage?
os: debian squeeze (up2date)
2 apache mod php webserver
2 memcache server
i have to apache mod_php nodes which use two memcache server for redundant session storage (used variant 3 from ...
2
votes
2answers
82 views
How much power draws a redundant PSU?
One supermicro enclosure comes with "3 SP382-TS 380W Power Modules for a total of 760W".
2x380W = 760W, okay, but there are 3! So where is the missing third 380W equalling to 1140W?? Is it ...
-1
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2answers
38 views
Adding Redundancy to Win 2008 and SQL Server
We have an Amazon EC2 Windows Server 2008 with SQL Server running Email2Database and another SQL-based windows application.
There is a lot of critical data on this box and we need to make sure that ...
0
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3answers
80 views
Providing internet redundancy for our colocation provider
My company recently had an network outage at our colocation facility that is serving our main website. The outage was caused by an upstream switch failure.
I was told by my ISP (who provides us with ...
4
votes
3answers
192 views
What hardware & software consideration does a major website require to properly manage 1000+ servers? [closed]
Sorry for such a high level question. I understand the basics of server load balancing, but the concept of managing 30,000 servers is a bit foreign to me. Is it really just the same concept of ...
2
votes
2answers
87 views
Disk Redundancy across different server
I have 3 servers, all with the same specs:
Intel CPU
8 GB RAM
Linux or BSD
Single 2TB desktop SATA with more than 10K Hours of operation, with only less than 300 GB Used
My provider cannot install ...
1
vote
2answers
126 views
SSD redundancy via HDD
Is there a way to guarantee redundancy to an SSD using an HDD?
Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to ...
-1
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2answers
59 views
Overview of multiple mx server set up
Would someone please show me the overview of how multiple mx for a single domain is set up to communicate with each other?
I am not talking about how to configure the postfix or DNS mx entries, I am ...
0
votes
1answer
25 views
Is the Blackberry “Move Server” command a reliable way to achieve redundancy?
BES supports moving more than one user in a domain to an alternate server as shown in the image below.
Does this mean I could achieve some level of redundancy by moving users from one BES server to ...
0
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4answers
133 views
How to build a redundant linux system? [closed]
What's the best path to build a FOSS rock solid redundant cluster with a bunch of atom servers?
Looking at beowulf, heartbeat, linux-ha they haven't evolved much lately, or am I wrong?
regards,
//t
1
vote
1answer
79 views
Cname and Amazon S3 failure
I had a quick question. If you set up a cname for your amazon bucket and lets say your main amazon s3 bucket goes down, does cname you created serve files, in other words, do your files get redirected ...
3
votes
3answers
126 views
Should redundant servers have exactly the same configuration, or slightly different?
If you provide a service on two servers to ensure high-availability, is it better to configure them in exactly the same way, of instead should you introduce slight differences to prevent "freak ...
1
vote
1answer
135 views
Redundancy for WordPress sites
For static websites I'm using HAProxy (one master, several nodes with static HTML files on them). What services in addition would you recommend to allow WordPress sites to be hosted in the same way in ...
1
vote
3answers
151 views
How to use a cloud to host web sites?
To host web sites currently we are using dedicated linux boxes hosted in the UK. But managing them is a nightmare, backups, massive loads, downtime etc...
I was looking into OpenStack which was ...
1
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2answers
44 views
Can we route video on my redundant link while the primary is up and turn it off if the primary fails over to secondary?
We have a remote location that is currently routing data over a satellite connection.
I am adding a cellular fail over if the satellite goes down.
I have been asked to install video cameras that ...
1
vote
1answer
63 views
Two trunks from two switches to router
I want to connect two switches with 6 vlans to a router. Both switches are connected to other switches and are there for redundancy. Router doesn't let me put same default gateways on both interfaces ...
0
votes
1answer
49 views
Redundance for different processes running on the same server
We have a system consisting of different components/services like database, webserver, fileshare, some self programmed daemons, etc. We now have the requirement to make all components/services ...
0
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1answer
53 views
Amazon EC2 SQL Instance with Cheap redundancy
I'm looking at transitioning from a dedicated hosting provide to Amazon's EC2 instances. The website is an asp/asp.net website with SQL Server 2008 as it's backend. It has zero redundancy as is ...
2
votes
1answer
124 views
Redundant NFS Setup?
Is it possible to create a fault tolerant, redundant NFS server (e.g. master/slave)?
Several of my web servers mount their WEBroot directories from a single NFS server (which is regularly backed up). ...
2
votes
1answer
51 views
Mac Server (Snow Leopard) NIC Redundancy on Separate Switches
I have a Mac Snow Leopard Server with 2 NIC's. Each NIC is plugged into a separate physical switch. Currently each NIC has it's own IP, but I would like to setup redundancy so that they communicate ...
1
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3answers
107 views
redundant nfs share
We are storing files on a network share, our application is mountig this drive using nfs. Now we have the requirement to have this drive redundant.
We can add a second server and then synchronize ...
1
vote
1answer
79 views
HP P410i as online spare
Is it possible to have dual P410i SAS controllers and use one for a online spare? I am fairly new to HP servers and I will be setting up a new G7 for production use.
I have been reading about HP's ...
0
votes
1answer
155 views
What is the industry standard solution for linux web server and mac file server failover systems?
I am a web developer at my company and am therefore qualified to be an IT guy, apparently. I have a single Ubuntu web and file server currently, but I want to break up the server tasks onto two ...
3
votes
4answers
99 views
MySQL Redundancy for High-Availability over the internet
I am testing out some infrastructure options before I start writing a web application. I would like to have two separate MySQL database servers at different physical locations, but if one of them ...
5
votes
1answer
147 views
Alternatives to Dell's mirrored SD card module for booting a small OS from flash?
Dell offers an add-on hardware card for some of their servers that provides a poor man's RAID1 between two SD cards (one card gets all the reads until it dies, writes are mirrored) for booting a ...
0
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1answer
143 views
Redundant Mailservers
We recently had a harddisk failure on our mail server (debian/postfix/courier) so I'm researching a way to build redundancy.
The first way I found was to setup multiple mx Records in the DNS Server ...
3
votes
2answers
157 views
PowerConnect switches, Juniper firewalls and esx redundancy
Let me preface this question by saying that I am a developer and have basic knowledge of networking. My current job requires that I wear many hats.
I am building out a DataCenter for our SaaS ...
0
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4answers
93 views
Multihomed email
Our primary MX record points to an external server which handles spam filtering, thereafter the mail is pushed to our internal mail server. The mail is never stored on the external server for longer ...
2
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5answers
227 views
Can you set a backup ip for your server in DNS?
Is there a way that the DNS protocol can natural hold a backup A type server address, like a backup name-server or mail server ? After googling i just got results on backup nameservers.
If there isnt ...
2
votes
2answers
140 views
Two mirrored database servers, or one twice as powerful
I'm looking at setting up a seperate database server for one of my applications, the application currently runs on 3 servers; 1 frontend server and 2 application/database servers. But for performance ...
0
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0answers
53 views
Using PowerChute Network Shutdown with redundant UPSs
I'm trying to figure out how to go about using PCNS to manage the following setup:
http://i.imgur.com/eXELh.jpg
Each of the 3 UPSs are APC SMX2000 units and have NMC installed.
The trouble I'm ...
0
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2answers
68 views
Cloning Two Windows Servers
Basically I have a server running MSSQL, MYSQL, APACHE, IIS, ORACLE, PERL and other windows services. I am looking for some hardware solution that would allow me to clone a server on to a back up and ...
1
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2answers
132 views
Is it possible to do storage without RAID and unnecessary redundancy?
I'm building multiple storage nodes for Riak database. Each node contains 20-40 x 2TB drives. Riak replicates each save to 3 nodes so there I have redundancy. Now the question is that what's the best ...
1
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3answers
197 views
Is it possible to use mixed 110V / 208V power on a single server with dual power supplies?
Is it possible to run a dual power supply server with one PS plugged into 110V, and the other power supply plugged into 208V? We've asked the vendors and they say they've never tested it or some other ...
0
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0answers
74 views
MTTF(n-plex) Formula
For an N-PLEX system, the formula is:
MTTF(N-plex) = MTTF(1-plex)N/( N * MTTRN-1)
However, given a system whose MTTF is 3 days and MTTR of 2 days... A 2-plex of the system would have MTTF(2-plex) = ...
2
votes
3answers
242 views
How do you set up redundant servers?
To the sysadmins out there, I'm trying to get an idea about how you go about maintaining redundant servers for small projects. The modest number of servers in my mind is two, and three main essential ...
-1
votes
1answer
35 views
web server & Redundancy [closed]
My company wish to have a web server redundancy. Any way is allow including having two physical server. Except this, is there any other way to have redundancy??
Any idea is appreciated.
Thanks in ...
2
votes
1answer
68 views
Server redundancy or failsafe for small single office server
We run a local server in our office, and have a domain name pointed to it so we can test out sites we build. We also handle some image hosting for clients for emails.
Since it's a single server, if ...
1
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3answers
214 views
Switch Redundancy for iSCSI
I am about to implement an iSCSI solution on our network. The thing that is bothering me though is that we are only using 1 switch from the SAN to node connections. Since each node has 2 NICs, is ...
2
votes
1answer
117 views
What steps can I take to ensure that my rails app on heroku isn't effected by another ec2 outage?
My app is a victim of the recent EC2 outage and is still offline. The outage has negatively effected my business and the relationship we have with our clients. I'm hosting the app on heroku with their ...
2
votes
1answer
104 views
Effects of having a rapid ARP flush
So the scenario is we have a web server at our colocation. In front of that web server are two SonicWalls and two L2 non-stacking managed switches. We're trying to find an efficient way to set up ...
4
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6answers
450 views
Redundant Load Balancers for Windows-based Web Servers?
I'm having some trouble trying to figure out the technical details of the below design; specifically in the area of the redundant load-balancers.
The web servers are running Windows Server 2003 R2 64 ...
1
vote
2answers
89 views
Placing UPS in front of STS; Connecting Dual PSU to same PDU
The site has 2 x 16A @ 230V, each server/SAN has dual PSU set up.
Options:
1) [2 x 16A] ---> [1 x STS or ATS]----> [1 xUPS]---->[2 x PDU]----->[DUAL PSU]
As can be seen the server is actually ...
0
votes
1answer
129 views
Windows Server 2008 multiple domain controllers?
We currently have a domain controller which has the profiles etc. for around 30 users. It is also the local DNS server and file server.
As it's our only Domain Controller, if we ever have to restart ...
0
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2answers
146 views
IIS7: one domain, one IP, two servers, one as fallback
I would like to have a setup where I can tell any of two servers to be the "main"-server on a specific IP (for redundancy reasons). Both servers should be accessible at any given time but only one ...
