- Community Home
- >
- Servers and Operating Systems
- >
- Operating System - Linux
- >
- System Administration
- >
- Re: RedHat 4.8 Smart Array p700m multipathing
-
- 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
- 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
03-27-2010 07:02 AM
03-27-2010 07:02 AM
RedHat 4.8 Smart Array p700m multipathing
I have compiled cpq_cciss-2.6.20-23 kernel module, because RedHat shipped module did not recognise the MSA2324sa raid array correctly.
hp_scsi_id command is also in use because standard scsi_id command does not recognise MSA2324sa raid array correctly.
hp_scsi_id reports the raid array like below:
hp_scsi_id -g -u -s /block/cciss\!c0d0
3600c0ff000da73d4dc94864b01000000
With this combination multipathing can be almost setup but it freezes on the on the stage of creating multipathing device, in kernel messages following messages are shown:
omcasg1 kernel: device-mapper: dm-multipath: unknown hardware handler type
omcasg1 kernel: device-mapper: error adding target to table
Is it so that RedHat 4.8 version device mapper (device-mapper-1.02.28-2.el4) would need to upgraded in order to get multipathing to work?
BR, MikkoT
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-29-2010 06:27 AM
03-29-2010 06:27 AM
Re: RedHat 4.8 Smart Array p700m multipathing
If you configure the smart array to present two disks as a raid 1 disk, the system only sees the one disk.
Multipathing does not come into play. This is actually a better way to go, because it takes part of i/o processing away from the CPU to a subsystem with a CPU.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-29-2010 09:41 AM
03-29-2010 09:41 AM
Re: RedHat 4.8 Smart Array p700m multipathing
thank you for your reply. I would like to rephrase my earlier message. I do not have local hard disk installed to the blade server. The MSA2324sa array is used for booting the blade. For redundancy purposes I would need at least two physical cable connection from C7000-chassis sas-switch pair to MSA2324sa array controllers. Therefore unfortunately RAID1 solution does not help me.
Does anyone has successfully implemented redundant connection with Smart Array p700m and MSA2324sa using RedHat 4 ES operating system?
BR, MikkoT
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-29-2010 07:34 PM
03-29-2010 07:34 PM
Re: RedHat 4.8 Smart Array p700m multipathing
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
05-07-2010 03:34 AM
05-07-2010 03:34 AM
Re: RedHat 4.8 Smart Array p700m multipathing
thank you for your suggestions on this multipathing issue. MSA2324sa was already initially already configured as active-active so that wasn't a reason this time.
Finally after reading numerous discussions related to this kind of case on the web and testing different combinations a working solution was found.
The main problem with RedHat 4.8 is that the supplied cciss kernel module does not recognize p700m and MSA2324sa array. It was updated with open-source cciss driver, cpq_cciss-2.6.20-23.
Second thing is that standard scsi_id command does not support MSA2324sa array. HP has wrote their own hp_scsi_id tool that does support MSA2324sa. This can downloaded as a part HPDMmultipath-4.4.0 package. hp_scsi_id was utilized on multipath.conf instead of normal scsi_id.
In order to get multipath booting to work new initrd needs to complied with multipathing support and hp_scsi_id included in the initrd image.
Finally mount entries in the /etc/fstab are pointed to multipath devices.
With these modifications multipathing on RedHat 4.8 works like a charm.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
05-07-2010 03:35 AM
05-07-2010 03:35 AM
Re: RedHat 4.8 Smart Array p700m multipathing
BR, MikkoT
Hewlett Packard Enterprise International
- Communities
- HPE Blogs and Forum
© Copyright 2021 Hewlett Packard Enterprise Development LP