Data loss due to network failures or accidents

[naveenkumarbasupally]

Can anyone suggest any steps to backup the data if data gets lost due to network failure???

[Kasun Bandara · Accepted solution]

@naveenkumarbasupally hi, this is broad question. mainly you may lost data due to application failures and server failures. normally network level you may lost data because of wrong routing configurations, wrong ACLs, etc. Other than that, data may loss due to network connection failures, but at TCP level, client and server always keep track of transmitting data and if anything lost in transmission, server or client will resend data. 

To maintain reliability in network, you can use redundant links and devices with proper routing configuration (if your concern about data loss at transmission). For scenarios like application/server failures, you need to have proper backup mechanism in place using backup software and environment such as backup appliance, backup storage, etc. 

[Leo Laohoo]

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@naveenkumarbasupally wrote:
Can anyone suggest any steps to backup the data if data gets lost due to network failure???

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Google that entire question.  The search will produce several pages of results.  

It is a matter of reading them.

[Joseph W. Doherty]

Data loss due to "network failure" is not all that uncommon.

Some networking protocols, like TCP mentioned by @Kasun Bandara will insure every transferred data segment is not corrupted and sender is notified of successful transfer, for the data segments.

However, TCP will not guarantee a whole set of data is delivered, only what was delivered isn't corrupted during transfer, and sender knows what reached the other side.

I.e. Higher levels of applications would need to monitor what something like TCP tells them, so they can determine if all data intended to be sent was successfully received.

There are many other ways to transfer data, across a network, without using TCP, and many of those don't provided the two above described features.  In fact, at the most basic level, networks work on a "best effort" basis, i.e. they will try to deliver the data, but no guarantees.

In many cases, you might consider a network works much like how PC/workstation moves data about disk drives.  If you copy a file to another file, on that system, what's actually guaranteed?