?
Solved

Replacing failed raid 1 with different speed drive

Posted on 2013-05-29
11
Medium Priority
?
1,517 Views
Last Modified: 2016-12-08
Hi,
Hopefully this is fairly simple.

I have a HP DL380G5 with a  HP Smart Array P400 controller (doing this from memory, not at system).  I have the system drives in a Raid 1 configuration using 2-Seagate ST9146803SS drives.  It looks like one has failed.

I found a drive locally,  ST9146852SS, that seems to be the same other than the rotational speed (specs below).

Is it possible to have two drives in an array that are of different speeds?

Seagate ST9146803SS - Savvio 10K.3 146GB 10K 6.0Gbps SFF Serial SCSI / SAS Hard Drive

Seagate  ST9146852SS - Savvio  15K.2 146GB 15K 6.0Gbps SFF Serial SCSI / SAS Hard Drive

Thanks,
--SM
0
Comment
Question by:smantz
[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
  • 5
  • 2
  • 2
  • +2
11 Comments
 
LVL 88

Expert Comment

by:rindi
ID: 39204857
The different speed won't matter. You just won't get any advantage of the higher speed as long as you don't also change the other drive for one running at that higher speed too.
0
 
LVL 97

Expert Comment

by:Experienced Member
ID: 39204860
I would be inclined to keep the two speeds the same, lest you run into some hardware synchronization issues that depend upon matched speeds. I do not know if this is the case, but I would not take the chance.  .... Thinkpads_User
0
 
LVL 47

Assisted Solution

by:David
David earned 800 total points
ID: 39204953
Actually you WILL get slight advantage with higher speed drive.  Every I/O on that disk will take less time than I/Os on the other disks.
0
Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

 
LVL 56

Accepted Solution

by:
andyalder earned 1200 total points
ID: 39205184
Agreed, fractional improvement with a faster disk. The controller does two types of load-balanced reads, if it is very busy it will split the reads between the two disks but if less busy it will send both disks for the data and take the first answer which is more likely to come from the fast disk.

Are you sure they are generic Seagate disks though and do not have HP's part numbers on them as well? HP load custom firmware on their disks with tweaked retry timeouts and slightly different capacity, generally smaller than the generic drive so that any other manufacturer's disk will also be large enough. If you upload an ADU report **as attachment** we can check what the controller sees it as. (ADU should be under Start-HP system tools if installed else it's under the ACU on the SmartStart CD)
0
 

Author Comment

by:smantz
ID: 39205843
Well I'll try and remote in and if I' can't, it will be tomorrow before I'm back on site.  But I'll upload whatever I can.
0
 

Author Comment

by:smantz
ID: 39205946
Here are the attachments from the ACU for the controller, hope they help.
-SM
ADUReport.txt
ADUReport.xml
ADUReportTransform.xsl
ADUReportViewer.htm
0
 

Author Comment

by:smantz
ID: 39206047
I do believe that these drives are generic as there weren't any drives when I received the unit.  If need be, I will  take the unit down and pull the drives to see if there is any HP numbers.
0
 
LVL 56

Expert Comment

by:andyalder
ID: 39206165
They are indeed generic drives from that report rather than HP branded ones so you are right to use a generic drive as replacement for now.
0
 

Author Comment

by:smantz
ID: 39206172
So you feel there really wouldn't be much of a risk trying and using this drive?
0
 
LVL 47

Expert Comment

by:David
ID: 39206196
SAS drives are all enterprise class so are similar or potentially same quality disks.  There are a few minor firmware tweaks that HP makes, but what you have is good enough for RAID1.  Now if you were doing RAID5 with max config of disks then I would say just to buy HP.
0
 

Author Closing Comment

by:smantz
ID: 39206208
These guys are great and if I could give more points, I would!!!  Thanks a million
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Employees depend heavily on their PCs, and new threats like ransomware make it even more critical to protect their important data.
When speed and performance are vital to revenue, companies must have complete confidence in their cloud environment.
In this Micro Tutorial viewers will learn how to restore single file or folder from Bare Metal backup image of their system. Tutorial shows how to restore files and folders from system backup. Often it is not needed to restore entire system when onl…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
Suggested Courses

770 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