- Community Home
- >
- Servers and Operating Systems
- >
- Operating Systems
- >
- Operating System - OpenVMS
- >
- fast "raw" disk reader utility? (Unix "dd"?)
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
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
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- 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
тАО03-08-2005 06:24 AM
тАО03-08-2005 06:24 AM
(DUMP dd: is way too slow, and
ANALYZE/DISK/READ dd: goes through the file system.)
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-08-2005 06:33 AM
тАО03-08-2005 06:33 AM
SolutionDoes this do what you want
http://h71000.www7.hp.com/freeware/freeware70/diskblock/
Purely Personal Opinion
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-08-2005 06:53 AM
тАО03-08-2005 06:53 AM
Re: fast "raw" disk reader utility? (Unix "dd"?)
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-08-2005 08:13 AM
тАО03-08-2005 08:13 AM
Re: fast "raw" disk reader utility? (Unix "dd"?)
Uwe: COPY would, except it is not asynchronous. BACKUP/PHYSICAL requires an actual location; can't create a save-set on the "standard" null device.
(If anyone has other ideas, I will still entertain them.)
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-08-2005 08:36 AM
тАО03-08-2005 08:36 AM
Re: fast "raw" disk reader utility? (Unix "dd"?)
"BACKUP/PHYSICAL requires an actual location; can't create a save-set on the "standard" null device."
Try with:
$ BACKUP/PHYSICAL dd: NLA0:DUMMY/SAVE_SET
Bojan
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-08-2005 09:30 AM
тАО03-08-2005 09:30 AM
Re: fast "raw" disk reader utility? (Unix "dd"?)
A note of caution is in order. To benchmark SAN performance, what you are describing may yield misleading results.
Many controllers have substantial caches, with a variety of settings. The speed of a raw sequential disk copy may be misleading, without a complete analysis of the cache interaction effects. For that matter, many heavy disk writers may benefit from tuning, depending upon the exact behavior of the IO subsystem.
In summary, without supporting work, this may be a misleading benchmark.
- Bob Gezelter, http://www.rlgsc.com