Solved

Replace drives in RAID 5

Posted on 2014-09-15
9
867 Views
Last Modified: 2016-12-08
I have a Proliant ML310e Gen8 setup with a RAID 5 array with 5 300Gb SAS Dual Port 10k drives. Two of the drives show imminent failure and I want to replace them. Would this work as hot-swappable drives or do I need to shutdown the server and rebuild the array? I'm just worried that if it forces me to reinitialize the array, it will wipe out everything out.

Thanks
0
Comment
Question by:Alan Dala
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
  • +3
9 Comments
 
LVL 12

Assisted Solution

by:Natty Greg
Natty Greg earned 100 total points
ID: 40324263
Hot swappable should be fine since each drive as an exact copy of the data, if you're still unsure please take a look at the link below
0
 
LVL 47

Assisted Solution

by:dlethe
dlethe earned 100 total points
ID: 40324292
Hot swap LITERALLY means hot swap .  It is the correct thing to do.  Replace them with system turned on  and running.

But best practice is to take a full backup first.  Rebuilding RAID is quite stressful and if all the disks went into service at the same time, then consider that they are all likely in the same shape and risk of failure.

(Shut down as many services and jobs as possible to speed up the rebuild)
0
 
LVL 12

Expert Comment

by:Natty Greg
ID: 40324309
0
Free eBook: Backup on AWS

Everything you need to know about backup and disaster recovery with AWS, for FREE!

 
LVL 34

Assisted Solution

by:Seth Simmons
Seth Simmons earned 100 total points
ID: 40324348
Two of the drives show imminent failure...

you need to be very careful here
raid 5 can only sustain 1 drive loss
when you replace the drives, ONLY do one at a time; don't pull both and replace both or your raid array is gone
i would do a full backup first in case the second drive fails before the first one finishes rebuilding
0
 
LVL 47

Expert Comment

by:dlethe
ID: 40324383
No, do what I wrote earlier, a full backup FIRST.   A rebuild is the most stressful thing you can do to a  HDD other than a burn-in.   You are in high risk of data loss with 2 drives showing IMMINENT failure.

Your #1 priority is a backup first, while all disks are online.  If a drive dies during the rebuild, you have 100% data loss.
0
 
LVL 55

Assisted Solution

by:andyalder
andyalder earned 100 total points
ID: 40325684
Default the ML310e gen8 only has the "dynamic smart array controller B120i" which is the Intel chipset plus HP's RAID stack and doesn't support RAID 5, you must have an addin card. Assuming it's a proper Smart Array controller you could upload an Array Diagnostic Report as an attachment, then we may be able to tell which drive is the worse of the two and hence the one to replace first.
0
 

Author Comment

by:Alan Dala
ID: 40325838
Thank you all for your responses.

How long do I have to wait before replacing the second hard drive? I don't see any messages in the Event Viewer or Disk Management...
0
 
LVL 55

Expert Comment

by:andyalder
ID: 40325912
Use the Array Configuration Utility to monitor the status, also once you remove one drive the "do not remove" lights should come on on the others as they should be in Gen8 caddies.
0
 
LVL 13

Accepted Solution

by:
Greg Hejl earned 100 total points
ID: 40325970
I would buy another drive and reformat your array into a RAID 10.

then going forward, look with suspicion any one who suggests implementing any RAID that requires Parity Striping - Parity Striping requires that ALL drives get rewritten after a drive failure, further endangering the Array (if another drive is near it's MBTF, this is when you will find out with disastrous results
0

Featured Post

Edgartown IT Case Study

Learn about Edgartown's quest to ensure the safety and security of the entire town's employee and citizen data. Read the case study!

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
Is your phone running out of space to hold pictures?  This article will show you quick tips on how to solve this problem.
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
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…

756 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