- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- Mixing SCSI Speeds on Smart Array controllers / de...
Disk Enclosures
1753435
Members
4719
Online
108794
Solutions
Forums
Categories
Company
Local Language
back
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Discussions
back
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Blogs
Information
Community
Resources
Community Language
Language
Forums
Blogs
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
03-12-2006 09:30 PM
03-12-2006 09:30 PM
Mixing SCSI Speeds on Smart Array controllers / devices
Can somone tell me what the situation is these days with regards to mixing SCSI device speeds in various situations?
I used to think that, if you added a "slower" drive to an array, the whole bus would slow down to that speed (e.g. adding Ultra2 drives to an Ultra320 array) but reading an older quickspecs recently (which I unfortunately didn't bookmark) gave me the impression that this wasn't the case.
Specifically I'm interested in what happens on a 4314R enclosure (which I have myself and wish to populate with more drives), but I'm also interested in what happens with an MSA1000 (which we have at work and would like to re-utilise old drives unless they sacrifice performance on the others.
In short, if I have some Ultra3 disks in the 4134R and later add some Ultra2 disks (probably to a seperate Array to keep like-for-like disks in each array) and wondered if it would slow down the whole system to Ultra2 speeds?
Any feedback / pointers would be appreciated.
Paul
I used to think that, if you added a "slower" drive to an array, the whole bus would slow down to that speed (e.g. adding Ultra2 drives to an Ultra320 array) but reading an older quickspecs recently (which I unfortunately didn't bookmark) gave me the impression that this wasn't the case.
Specifically I'm interested in what happens on a 4314R enclosure (which I have myself and wish to populate with more drives), but I'm also interested in what happens with an MSA1000 (which we have at work and would like to re-utilise old drives unless they sacrifice performance on the others.
In short, if I have some Ultra3 disks in the 4134R and later add some Ultra2 disks (probably to a seperate Array to keep like-for-like disks in each array) and wondered if it would slow down the whole system to Ultra2 speeds?
Any feedback / pointers would be appreciated.
Paul
1 REPLY 1
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
03-13-2006 01:03 AM
03-13-2006 01:03 AM
Re: Mixing SCSI Speeds on Smart Array controllers / devices
Paul:
As far as I know, your performance will only be as good as the slowest drive... but you probably know that already.
So in effect, even if the rest of the "faster" drives are running at their normal rate, your i/o still suffers since the rest of the faster drives can't do anything until the slower drive completes the process.
Now, if you were to use slower drives ONLY in a separate array, then it should not matter too much since your I/O is not dependant upon a mixture of slow/fast drives.
If you can take it a step further and split your different drives across the 2 buses in the 4134R (assuming you may have meant 4154R), then effectively... you will split the drives on 2 different channels of an array contrller giving you the possibly of not efffecting the i/o of the fastr disks at all.
As for the MSA... it is U160 genetically so there isn't too much different if you use U2 drives vs U3 or U320 (The U320's are runnign at 160 anyway).
Steven
As far as I know, your performance will only be as good as the slowest drive... but you probably know that already.
So in effect, even if the rest of the "faster" drives are running at their normal rate, your i/o still suffers since the rest of the faster drives can't do anything until the slower drive completes the process.
Now, if you were to use slower drives ONLY in a separate array, then it should not matter too much since your I/O is not dependant upon a mixture of slow/fast drives.
If you can take it a step further and split your different drives across the 2 buses in the 4134R (assuming you may have meant 4154R), then effectively... you will split the drives on 2 different channels of an array contrller giving you the possibly of not efffecting the i/o of the fastr disks at all.
As for the MSA... it is U160 genetically so there isn't too much different if you use U2 drives vs U3 or U320 (The U320's are runnign at 160 anyway).
Steven
Steven Clementi
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
News and Events
Support
© Copyright 2024 Hewlett Packard Enterprise Development LP