- Community Home
- >
- Servers and Operating Systems
- >
- HPE ProLiant
- >
- ProLiant Servers (ML,DL,SL)
- >
- Re: Poor Disk Performance Again
ProLiant Servers (ML,DL,SL)
1753523
Members
11606
Online
108795
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
01-08-2001 04:00 PM
01-08-2001 04:00 PM
Poor Disk Performance Again
I have been doing some more tests on physical write/bytes per sec on the ML370 and get an average of just over 3Mb/sec copying a 1.3Gb raw data file. Or 7.2 Minutes to copy. Supposing that we should be running at 160Mb/sec (The 431 is U3 as are the drives) then in theory we should expect 160Mb/sec on burst, say for argument's sake that averages out to 50% which gives us 80Mb/sec. As we are running Raid 5 and don't have any write cache, shall we deduct another 50%? This then gives us 40Mb/sec. So at 40Mb/sec that should copy our file in 35 seconds. It currently takes 10 times as long. I understand your argument regarding the write cache, but can it have this much of a detrimental effect?
Incidentally, with the same file on the 1600R (mirrored), I get approx 5Mb/sec. (again way below Ultra2 scsi performance) - the same file on my laptop (PIII 700, 20Gb IDE) I get 3Mb/sec !
Also - I have now upgraded the internal SCSI cable to part # 166389-B21 - The recommended cable to get U3 performance;
I have now noted that this has not improved performance at all.
I am now going to try an SA5302 to see what happens.
Can you point me to any benchmark tests and performance figures re disk i/o & DTR's etc as I can't find any on the Compaq site? This would be most helpful.
Many thanks
Jim
Incidentally, with the same file on the 1600R (mirrored), I get approx 5Mb/sec. (again way below Ultra2 scsi performance) - the same file on my laptop (PIII 700, 20Gb IDE) I get 3Mb/sec !
Also - I have now upgraded the internal SCSI cable to part # 166389-B21 - The recommended cable to get U3 performance;
I have now noted that this has not improved performance at all.
I am now going to try an SA5302 to see what happens.
Can you point me to any benchmark tests and performance figures re disk i/o & DTR's etc as I can't find any on the Compaq site? This would be most helpful.
Many thanks
Jim
1 REPLY 1
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
01-09-2001 04:00 PM
01-09-2001 04:00 PM
Re: Poor Disk Performance Again
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