Solved

LUN crash?

Posted on 2011-02-15
7
491 Views
Last Modified: 2012-05-11

can LUN crash just like a server can? what is the DR best practice for LUNs?
0
Comment
Question by:anushahanna
  • 3
  • 2
  • 2
7 Comments
 
LVL 21

Accepted Solution

by:
robocat earned 250 total points
ID: 34900877

A LUN can become corrupted due to hard- or software errors, and the data on it unusable.

The SAN storage system can crash which leaves the LUN unaccessible. If the disk storage gets damaged, the LUN may be lost.

Best practice: SAN mirroring for protection against outages of the storage system. Regular SAN backups or snapshots for protection against logical errors.

0
 
LVL 6

Author Comment

by:anushahanna
ID: 34903158
i guess the hard errors can't be recovered - can the soft ones?
0
 
LVL 21

Assisted Solution

by:robocat
robocat earned 250 total points
ID: 34904363

It's very difficult to recover even from soft errors. As a LUN is a logical hard disk, one could try to use a hard disk recovery tool on the host that is using the LUN.

Best is to use snapshotting to be able to roll back to a state from before the errors, if the SAN supports snapshots.
 
0
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 
LVL 55

Assisted Solution

by:andyalder
andyalder earned 250 total points
ID: 34905206
The controllers in the SAN can crash, nobody offers 100% uptime, 99.999% is a pretty common figure you'll see.
0
 
LVL 6

Author Comment

by:anushahanna
ID: 34907830
OK- 99.999% means that technology is so stable, only 1 in 1000 LUN implementations could be expected to fail, for whatever reason?

>>The controllers in the SAN can crash
that is the hard crash, right? what causes soft crash?
0
 
LVL 55

Assisted Solution

by:andyalder
andyalder earned 250 total points
ID: 34908238
99.999% reliability means it'll work for 99.999% of the time, commonly known as five nines - http://en.wikipedia.org/wiki/Five_nines

Soft crashes are down to your server corrupting the filesystem on the LUN normally, the most common one we see at EE is someone having two servers accessing the same LUN when they don't have any clustering software installed.
0
 
LVL 6

Author Comment

by:anushahanna
ID: 34908449
thanks for the guidance...
0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Each year, investment in cloud platforms grows more than 20% (https://www.immun.io/hubfs/Immunio_2016/Content/Marketing/Cloud-Security-Report-2016.pdf?submissionGuid=a8d80a00-6fee-4b85-81db-a4e28f681762) as an increasing number of companies begin to…
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question