Solved

1TB versus 2TB RAID 6 and RAID 10

Posted on 2013-06-14
5
683 Views
Last Modified: 2016-11-23
I'm considering using 2TB drives in a RAID 6 or a RAID 10 configuration.  I'm concerned about the rebuild time...   Recently using a Dell Perc 5/i controller I saw a 1TB member in a RAID 10 array take 4-5 days to rebuild.  Does this mean it could take almost two weeks for a 2TB RAID 10 member to rebuild?  Also, does RAID 6 take even longer to rebuild?
0
Comment
Question by:gopher_49
  • 2
  • 2
5 Comments
 
LVL 47

Expert Comment

by:dlethe
ID: 39248186
Not necessarily. It took 4-5 days because the surviving disks had a bunch of recoverable read errors, so it could have taken 4-5 seconds, assuming enterprise drives to get a 512 byte chunk., and I expect system was booted and doing a lot of I/O on it's own so rebuild was low priority.

In perfect world where you have enterprise drives and no such problems with deep recovery, and the system isn't booted so not competing with other I/O ... rebuild should run at near media speeds in a RAID10.  If the HDD is capable of writing at 100MB/sec sustained, and you have 1000MB disk drives (to make the math easy), then it should have taken 2 x 1000/100 seconds.

Now in a RAID6 rule-of-thumb for a rebuild using 5 disks, each 1000MB, and that same 100MB/sec transfer on that controller, maybe (5 - 1) * 1000/100 seconds    (roughly)
0
 

Author Comment

by:gopher_49
ID: 39248390
So,

It is safe to use 2TB SATA drives in a RAID 6 or 10 config?  I assume I need to purchase the better quality drives...
0
 
LVL 47

Accepted Solution

by:
dlethe earned 250 total points
ID: 39248484
Yes, you need enterprise class SATA drives, and not just any enterprise class, such as the WD drives.  Dell doesn't certify them.  Go with the Seagate ES family of enterprise SATA.  Look at the constellation class on their website.  Or if you prefer to get Dell support & warranty, contact them and they'll be happy to sell you the right drives.
0
 
LVL 118

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 250 total points
ID: 39248546
Really depends on your disks, do you not have any other servers you can move VMs to, so no I/O is occuring on the server, whilst the rebuild is taking place.
0
 

Author Comment

by:gopher_49
ID: 39248688
I'll have vMotion in this new environment... And I typically get Seagate ES Constellation drives....  Sounds like I'm good.

thanks!
0

Featured Post

Save on storage to protect fatherhood memories

You're the dad who has everything. This Father's Day, make sure your family memories are protected. My Passport Ultra has automatic backup and password protection to keep your cherished photos and videos safe. With up to 3TB, you have plenty of room to hold the adventures ahead.

Join & Write a Comment

In this step by step tutorial with screenshots, we will show you HOW TO: Enable SSH Remote Access on a VMware vSphere Hypervisor 6.5 (ESXi 6.5). This is important if you need to enable SSH remote access for additional troubleshooting of the ESXi hos…
In this article, I will show you HOW TO: Create your first Windows Virtual Machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, the Windows OS we will install is Windows Server 2016.
Teach the user how to configure vSphere Replication and how to protect and recover VMs Open vSphere Web Client: Verify vsphere Replication is enabled: Enable vSphere Replication for a virtual machine: Verify replicated VM is created: Recover replica…
Teach the user how to install log collectors and how to configure ESXi 5.5 for remote logging Open console session and mount vCenter Server installer: Install vSphere Core Dump Collector: Install vSphere Syslog Collector: Open vSphere Client: Config…

747 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

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now