In engineering: Redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe. In information theory: It is the number of bits used to transmit a message minus the number of ...

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2answers
24 views

Raid 5 for more than one failing disk [closed]

RAID 5 works the following: Disk1 | Disk2 | Disk3 A | B | A xor B A xor B is called the parity and it can be on a different disk for different blocks. Now, whenever one disk fails, one can ...
0
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0answers
20 views

merge two net adapters for better stability and bandwidth

On Windows 8 x64 I use two main methods of connectivity: wifi usb 3G modem Both have stability issues. Each has a theoritical max of 512kbps from the ISP. What is a hopefully simple, built-in to ...
0
votes
1answer
25 views

Find files with data errors

I have to back up a lot of files from DVDs. I am encountering cyclic redundancy check errors for some of the files. I am wondering if there is a Windows command line utility that will find all files ...
0
votes
1answer
125 views

What GPT partition type to use for protecting DRBD metadata?

I'm planning to install a DRBD device on a (replicated) disk with two GPT partitions. DRBD requires some space for (preferentially "internal") metadata at the end of the underlying device. I'm ...
0
votes
0answers
24 views

How to boot to a second device if the first fails to boot

Image a system with 2 harddrives (non-raid). If the first disks fails to boot then the second should take over. I can do that using the bootsequence in the BIOS, but that would only work if disk 1 ...
0
votes
1answer
146 views

Adding parity to backup dvds

I am backing up about 1.8GB of pictures to a dvd, but because over half the disk is free, I would like to add parity of the free space so that data can be read even after some data corruption has ...
1
vote
0answers
34 views

Intra-disk redundancy options

I have enough single disk systems deployed in harsh-environments that https://en.wikipedia.org/wiki/Bit_rot is a problem. Disks get corrupted regularly. My question is, if I'm willing to sacrifice a ...
0
votes
2answers
163 views

Is there a type of redundant disk filesystem that allows for some loss of data?

I'm building a media server on a budget. Currently, the design is to have four 500GB disks in a JBOD-type format giving me one large 2TB store. The problem is if any disk fails, I lose the whole ...
0
votes
1answer
291 views

How to wrap an UDP connection to improve resistance agains packet loss?

Suppose there is UDP connection that does not expect much packet loss. Are there already tools that allow wrapping a UDP connection to gain more reliability at expence of bandwidth and overhead, for ...
0
votes
0answers
303 views

What is the risk of removing old Python versions on OSX?

I have a stock install of OSX (10.6). It has a whole bunch of different versions of Python installed: versions 2.3, 2.4, 2.5, and 2.6 came stock with the system. I can view them all in ...
2
votes
0answers
64 views

set static Network settings, enable a wifi adapter

Here is my scenario, I have a computer with a LAN Connection and a WiFi Connection, running Windows XP Pro. I have a local network router (WRVS4400Nv2 from Cisco) with Wireless access and a separate ...
1
vote
2answers
163 views

Backing Up vs. Redundancy [closed]

I'm currently in stage 2 of 3 of building my home workstation. What this means is that my RAID-0 array of solid state disks will be backed up nightly to a RAID-5 or RAID-6 array of traditional ...
0
votes
1answer
62 views

ADSL Connections

Can you have two ADSL connections on a single phone line? Or by law of IT, do two Broadband connections require two separate phone lines and BT master sockets?
1
vote
1answer
369 views

Can I ensure data redundancy on the server when I use RSYNC?

Let's say I have server which provides a mission critical services, these services rely on data which are synced from another server. The question is whenever I can assure data redundancy on the ...
0
votes
1answer
244 views

Setting up Raid 1 Array for Home Server

I'm not sure if this is even possible, but it's worth asking on here! Essentially I have a old machine at home (well, not old hardware wise, but I recently built a new gaming rig), which I decided to ...
2
votes
1answer
939 views

What should I do when i get this data cyclic error trying to copy files?

I was trying to copy a file from my local hard drive to an external hard drive and i am getting this error. Cannot copy IMG_9212: Data error (cyclic redundancy check). Should i be worried about ...
2
votes
4answers
908 views

Linux software RAID robustness for RAID1 vs other RAID levels

I have a RAID5 array running and now also a raid1 that I set up yesterday. Since RAID5 calculates parity it should be able to catch silent data corruption on one disk. However for RAID1 the disks are ...
0
votes
0answers
316 views

Redundant default gateways on LAN

I have two default gateways in my network: 192.168.1.1 and 192.168.1.2. Is there a way to make Windows clients to detect the dead gateway and chnage over to the wowrking one automatically? My gateways ...
2
votes
2answers
2k views

How does RAID 1 determine whether a disk is corrupted?

I've built a RAID 1 array of 2 disks, A and B. That means that every bit on A is equal to a bit on B. If one disk fails, I can safely retrieve my data from the other disk. But then I started ...
0
votes
1answer
322 views

Redundant CTRL-SPACE proposal in Eclipse

How do I remove the redundant Ctrl-Space proposal in Eclipse? SWT JPA JAX-WS etc. Example: I just need Java standard first time click Ctrl-Space proposal.
1
vote
2answers
259 views

DFS for a several small clusters over WAN

My friends and I all have TBs on our system(s). None of us have any full backups which are geographically distributed however, because at that amount of data, solutions such as Dropbox, S3, et al. are ...
7
votes
2answers
664 views

Can Linux scrub memory?

Does Linux have a mechanism to "scrub" memory? e.g. testing the memory and marking areas as dirty if they fail so that the system can continue to operate "safely" even with bad ram chips installed?!
0
votes
2answers
96 views

Hard drive configuration advice

I've got a few hard discs that I'd like to put in some sort of redundant configuration. Their sizes are: 600 GB 1 TB 2 TB I'm not sure if this is possible, but I'd like to be able to abstract the ...
14
votes
0answers
2k views

How long will an unused hard drive store its memory? [duplicate]

Possible Duplicate: How much time until an unused hard drive loses its data? I have a broken laptop, and it's the motherboards fault that it can't turn its power on. The laptop has been ...
4
votes
1answer
339 views

Adding redundancy to unused space of a DVD

I have a 900 MB file and I'd like to safely archive it on a DVD. As you can see 3/4 of the space will be empty. Besides the obvious possibility to just write the same file with 4 different names is ...
9
votes
1answer
218 views

What is the practical value of redundancy in zip files?

How is redundancy implemented in zipping, and how do I benefit from it? I'd assume it consists of something like storing the lookup tables twice so a single defect does not invalidate the whole rest ...
3
votes
2answers
624 views

Automatic failover of two internet connections Mac OS X

Is there any way to set up an automatic failover for internet connections within Mac OSX? Basically the main connection would be ethernet or wifi and if the main connection goes does, it would switch ...
2
votes
2answers
398 views

RAID-like filesystem for heterogeneous set of hard disks

During the last years I have accumulated a quite heterogeneous set of hard disks of different sizes and speeds for storing my private data. I'm planning to put them in a self build Linux filer to ...
0
votes
1answer
827 views

What happens if a Drobo experiences a power failure during a rebuild?

I recently purchased a Drobo and I was wondering, what happens to the Drobo if it's in the middle of a rebuild and there's a power failure? I know that the Drobo cannot protect against a disk failure ...
2
votes
1answer
154 views

Drobo redundancy

Given the inexplicable demise of Drive Extender technology in Windows Home Server, I am considering other options, such as replacing it with Drobo (and a linux server). One thing I'm not 100% clear ...
1
vote
0answers
34 views

A main supply with more than 800 watt and a triple redundancy [closed]

Does anyone know where to get this hot equipment? Very often the hardware shops do not declare explicitly the triple redundancy. They just write "redundant" not more.
2
votes
11answers
8k views

RAID 1 mirroring to more than two drives?

I do not trust any RAID types for home use. I've got 2 Terabytes of Data that I want to copy (duplicate) to about 4-6 drives for redundancy so that I will never lose these pics and videos I've ...
4
votes
6answers
2k views

Software Alternative to RAID for Home Use

I have a ton of data that I've been keeping 2 complete copies of between my Desktop and Laptop for a couple years now; I figure its about time to buy some more drives and make sure I don't lose any of ...