Skip to ContentSkip to Footer
Start of content
- Community Home
- >
- Servers and Operating Systems
- >
- Operating System - Linux
- >
- System Administration
- >
- Re: multipathing issue in linux
System Administration
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
-
- Forums
-
- Advancing Life & Work
- Advantage EX
- Alliances
- Around the Storage Block
- HPE Ezmeral: Uncut
- OEM Solutions
- Servers & Systems: The Right Compute
- Tech Insights
- The Cloud Experience Everywhere
- HPE Blog, Austria, Germany & Switzerland
- Blog HPE, France
- HPE Blog, Italy
- HPE Blog, Japan
- HPE Blog, Middle East
- HPE Blog, Russia
- HPE Blog, Saudi Arabia
- HPE Blog, South Africa
- HPE Blog, UK & Ireland
-
Blogs
- Advancing Life & Work
- Advantage EX
- Alliances
- Around the Storage Block
- HPE Blog, Latin America
- HPE Blog, Middle East
- HPE Blog, Saudi Arabia
- HPE Blog, South Africa
- HPE Blog, UK & Ireland
- HPE Ezmeral: Uncut
- OEM Solutions
- Servers & Systems: The Right Compute
- Tech Insights
- The Cloud Experience Everywhere
-
Information
- Community
- Welcome
- Getting Started
- FAQ
- Ranking Overview
- Rules of Participation
- Tips and Tricks
- Resources
- Announcements
- Email us
- Feedback
- Information Libraries
- Integrated Systems
- Networking
- Servers
- Storage
- Other HPE Sites
- Support Center
- Aruba Airheads Community
- Enterprise.nxt
- HPE Dev Community
- Cloud28+ Community
- Marketplace
-
Forums
-
Blogs
-
Information
-
English
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
- Email to a Friend
- Report Inappropriate Content
10-10-2009 12:07 AM
10-10-2009 12:07 AM
multipathing issue in linux
Dear all,
Can anybody help me reagrding multipathing issue in linux.
Iam using hitachi modular storage. I configured 8 luns in the storage.this luns are sharable to two servers which is in cluster.
My issue is when iam executing #fdisk -l command in server it showing totally 16 device files.
That means for each lun there will be two device files .
How can i solve the problem . By installing any multipathing software the problem will solve?
What exactly i have to do.. waiting for yours valuable reply.......
Can anybody help me reagrding multipathing issue in linux.
Iam using hitachi modular storage. I configured 8 luns in the storage.this luns are sharable to two servers which is in cluster.
My issue is when iam executing #fdisk -l command in server it showing totally 16 device files.
That means for each lun there will be two device files .
How can i solve the problem . By installing any multipathing software the problem will solve?
What exactly i have to do.. waiting for yours valuable reply.......
2 REPLIES 2
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
10-10-2009 04:24 AM
10-10-2009 04:24 AM
Re: multipathing issue in linux
Yes, some sort of multipathing software is obviously required.
The device-mapper-multipath system available in modern Linux distributions (and recommended by RedHat) is a manufacturer-agnostic solution. It can identify the disks using standard WWID numbers or a collection of known manufacturer-specific identification methods. It presents a third set of devices, where each device refers to a particular disk using any and all available paths.
There are two ways of naming the multipathed disk devices in device-mapper-multipath. If the FriendlyNames option is enabled in /etc/multipath.conf, the default names are like /dev/mapper/mpath, where is a number. If FriendlyNames is off, the default name is /dev/mapper/ where is a long string of hexadecimal digits guaranteed to be unique for each disk/LUN by the storage manufacturer.
Device-mapper-multipath does not hide the /dev/sd* devices corresponding to individual paths, so that with 8 LUNs with 2 paths each you would see 16 /dev/sd* devices and 8 multipath devices. This allows you to use the /dev/sd* devices if you have a specific need to avoid multipathing, e.g. if you wish to measure the performance of a particular path. You can use the "multipath -l" command to see how the multipath devices are mapped to /dev/sd* devices and the states of each individual path.
Some FibreChannel HBA manufacturers offer versions of HBA drivers for Linux that include multipath functionality. These drivers require at least two HBAs from the same manufacturer and their load-balancing features may be limited to failover-only.
Device-mapper-multipath can do load balancing between multiple paths if the storage system allows simultaneous use of both paths (i.e. active/active multipathing). On the other hand, multipath solutions built into HBA drivers may hide the presence of multiple paths and allow the system to be administered just like with regular single-pathed disks.
MK
The device-mapper-multipath system available in modern Linux distributions (and recommended by RedHat) is a manufacturer-agnostic solution. It can identify the disks using standard WWID numbers or a collection of known manufacturer-specific identification methods. It presents a third set of devices, where each device refers to a particular disk using any and all available paths.
There are two ways of naming the multipathed disk devices in device-mapper-multipath. If the FriendlyNames option is enabled in /etc/multipath.conf, the default names are like /dev/mapper/mpath
Device-mapper-multipath does not hide the /dev/sd* devices corresponding to individual paths, so that with 8 LUNs with 2 paths each you would see 16 /dev/sd* devices and 8 multipath devices. This allows you to use the /dev/sd* devices if you have a specific need to avoid multipathing, e.g. if you wish to measure the performance of a particular path. You can use the "multipath -l" command to see how the multipath devices are mapped to /dev/sd* devices and the states of each individual path.
Some FibreChannel HBA manufacturers offer versions of HBA drivers for Linux that include multipath functionality. These drivers require at least two HBAs from the same manufacturer and their load-balancing features may be limited to failover-only.
Device-mapper-multipath can do load balancing between multiple paths if the storage system allows simultaneous use of both paths (i.e. active/active multipathing). On the other hand, multipath solutions built into HBA drivers may hide the presence of multiple paths and allow the system to be administered just like with regular single-pathed disks.
MK
MK
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
10-11-2009 02:54 PM
10-11-2009 02:54 PM
Re: multipathing issue in linux
See this post here how to implement multipathing step by step - https://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1375018
regards,
ivan
regards,
ivan
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.
End of content
United States
Hewlett Packard Enterprise International
Communities
- Communities
- HPE Blogs and Forum
© Copyright 2021 Hewlett Packard Enterprise Development LP