- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- Disks in XP arrays
-
- Forums
-
Blogs
- Alliances
- Around the Storage Block
- Behind the scenes @ Labs
- HPE Careers
- HPE Storage Tech Insiders
- Infrastructure Insights
- Inspiring Progress
- Internet of Things (IoT)
- My Learning Certification
- OEM Solutions
- Servers: The Right Compute
- Shifting to Software-Defined
- Telecom IQ
- Transforming IT
- Infrastructure Solutions German
- L’Avenir de l’IT
- IT e Trasformazione Digitale
- Enterprise Topics
- ИТ для нового стиля бизнеса
- Blogs
-
Quick Links
- Community
- Getting Started
- FAQ
- Ranking Overview
- Rules of Participation
- Contact
- Email us
- Tell us what you think
- Information Libraries
- Integrated Systems
- Networking
- Servers
- Storage
- Other HPE Sites
- Support Center
- Enterprise.nxt
- Marketplace
- Aruba Airheads Community
-
Forums
-
Blogs
-
InformationEnglish
- 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
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-13-2006 03:47 AM
03-13-2006 03:47 AM
I have xpinfo output for one of the XP256 arrays connected to a HP-UX 11.00 server.
Sample displayed below (Only relevant fields displayed)
/dev/rdsk/c33t0d0 XP256 CL2A 00:00 14014 RAID1 1-1
/dev/rdsk/c53t0d1 XP256 CL1A 00:02 14014 RAID1 1-1
/dev/rdsk/c33t0d2 XP256 CL2A 00:04 14014 RAID1 1-1
/dev/rdsk/c53t0d3 XP256 CL1A 00:06 14014 RAID1 1-2
/dev/rdsk/c33t0d4 XP256 CL2A 00:08 14014 RAID1 1-2
/dev/rdsk/c53t0d5 XP256 CL1A 00:0a 14014 RAID1 1-3
/dev/rdsk/c33t0d6 XP256 CL2A 00:0c 14014 RAID1 1-3
/dev/rdsk/c53t0d7 XP256 CL1A 00:0e 14014 RAID1 1-3
/dev/rdsk/c33t1d0 XP256 CL2A 00:10 14014 RAID1 1-4
/dev/rdsk/c53t1d1 XP256 CL1A 00:12 14014 RAID1 1-4
/dev/rdsk/c13t0d0 XP256 CL1E 00:14 14014 RAID1 1-5
/dev/rdsk/c73t0d1 XP256 CL2E 00:16 14014 RAID1 1-5
/dev/rdsk/c13t0d2 XP256 CL1E 00:18 14014 RAID1 1-5
Raid grp Disk Mechs
1-1 R107 R117 --- ---
1-2 R127 R137 --- ---
1-3 R100 R110 --- ---
1-4 R120 R130 --- ---
1-5 R106 R116 --- ---
Now my questions are
1. Are the disks shown in Disk Mechs correspond to actual physical disks in XP array ?
2. Why is it that the alternate disk groups are having 2 and 3 CU:LDEVs - why not same number ?
I am aware command view is used to get info on XP arrays and only the LUNs made visible to the server are visible through xpinfo. But I do not have access to command view - with this limitation can anyone please provide help on the queries.
The disks are 36 GB disks and each LUN is OPEN-8*2 (14014 MB).
Please let me know if anything else is requried.
Thanks,
Ninad Date
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-13-2006 06:31 AM
03-13-2006 06:31 AM
Re: Disks in XP arrays
2.) That's how your LUNs were presented.. ask your storage admin.
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-13-2006 08:48 PM
03-13-2006 08:48 PM
Re: Disks in XP arrays
Thanks for your guidance.
Only one thing - I had read somewhere that the 7+1P or ... are available with latest firmware for XP1024 , but not for XP256.
Please can you confirm.
Thanks,
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-13-2006 11:57 PM
03-13-2006 11:57 PM
Re: Disks in XP arrays
RAID5 (7&1) is supported starting with XP128 / XP1024 and of course the XP1000 / XP12000.
Your configuration:
RAID Group 1-1 is RAID1 and consists of physical disks R107 and R117.
It presents 3 LUNs of 14GB to your HP-UX server:
/dev/rdsk/c33t0d0 XP256 CL2A 00:00 14014 RAID1 1-1
/dev/rdsk/c53t0d1 XP256 CL1A 00:02 14014 RAID1 1-1
/dev/rdsk/c33t0d2 XP256 CL2A 00:04 14014 RAID1 1-1
Easy as that
Peter
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-14-2006 12:18 AM
03-14-2006 12:18 AM
Re: Disks in XP arrays
Yes it seems as simple as you explained. But what I am not able to understand is that why the alternate raid-groups are having 2 and 3 CU:LDEVs ? why not 3 in all raid groups or why not 2 in all raid groups ?
Also as per my understanding 36 GB disks are used. If you use 36 GB disks in a RAID1 we will have 36 GB usage apce in which I can create 2* 14GB LDEVs and still have 8 GB space unused. Also I cannot have 3 * 14 GB LDEVs in a raid group using 2 disks and RAID1. So how are 3 LDEVs possible in one RAID group ?
The only way I can see is that if I can combine 2 raid groups then I can have 5 LDEVs of 14 GB amongst them thus only then it may be possible to see 2 LDEVs in one raid group and 3 LDEVs in next raid group. But then how does the xpinfo show the disk mechs as being different for both the raid groups - one raid group should show all the 4 disks as it is spanning across disks - if this is possible at all in the first place.
Please can anyone help on the above. How does it all work in reality. I have not worked on XP arrays, I am trying to check if any disks are unused and can be made available to be shifted to some other array.
Thanks a lot,
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-14-2006 04:21 PM
03-14-2006 04:21 PM
Re: Disks in XP arrays
Any help please.
Thanks,
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-15-2006 09:38 PM
03-15-2006 09:38 PM
Re: Disks in XP arrays
Any help please .
Thanks,
Ninad Date
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-15-2006 11:13 PM
03-15-2006 11:13 PM
Re: Disks in XP arrays
I was out yesterday!
Well, I can actually not fully understand your configuration!
Can you provide a serial number of your XP256? I need the last 5 digits.
I can then have a look at your HW configuration in the HP database.
I assume your LUNs are not equal.
Cheers
Peter
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 12:11 AM
03-16-2006 12:11 AM
Re: Disks in XP arrays
Thanks a lot.
The serial no - last 5 digits is 55289 for the XP256 array.
Please let me know, If you want I can provide the full xpinfo output as well.
Thanks very much,
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 12:45 AM
03-16-2006 12:45 AM
SolutionYour 36GB Disk Groups each are configured with 5x Open-8
Group 1-1 look like that
CU-LDEV 0-00 0-01 0-02 0-03 0-04
Group 1-2 look like that
CU-LDEV 0-05 0-06 0-07 0-08 0-09
In your XPINFO output above you only see the staring LDEV of a LUSE.
It looks like your LUSEs consist of
LDEV --------- Disk Group
0-00 + 0-01 -- 1-1
0-02 + 0-03 -- 1-1
0-04 + 0-05 -- 1-1 and 1-2
0-06 + 0-07 -- 1-2
0-08 + 0-09 -- 1-2
etc.
I hope this clears it up!
Cheers
Peter
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 12:55 AM
03-16-2006 12:55 AM
Re: Disks in XP arrays
Peter is correct.. some of your RAID groups have LUSE (LUN expansion) -- which I think you]ve mentioned earlier youve LUSE*2.. you can check this out via SCSI inquiry (EMC's inquire command or other SCSI inquiry tools). I do not think xpinfo does justice and portrays what LDEVs have been LUSEd.
HTH.
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 01:08 AM
03-16-2006 01:08 AM
Re: Disks in XP arrays
I got it. That solves the whole riddle I have been trying to understand for quite a while.
Thanks so much.
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 01:14 AM
03-16-2006 01:14 AM
Re: Disks in XP arrays
BTW, do not misconstrue LUSE'ing ldevs as a performance boost -- LUSE'ing ldevs is a means to carve up bigger LUNs. Note also that LUSEs are simply concats of your standard LDEVs.
I rarely use/request LUSEs. I Always use the host's volume manager to carve up bigger and better performing storage units (volumes?lvols) by striping them -- which is the best practice for XP/Hitachi arrays. (Yes XP arrays are rebadged Hitachi arrays).
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 11:13 PM
03-16-2006 11:13 PM
Re: Disks in XP arrays
OK. Just can you let me know is there limit to the LDEV size due to which its required to configure LUSE to get bigger LUNs ? - what is the limit ? What is the disadvantage of LUSE over normal LDEVs?
Thanks,
Ninad
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
03-16-2006 11:42 PM
03-16-2006 11:42 PM
Re: Disks in XP arrays
Advantages:
Performance - Each LUN has an IO queue
Flexibility - You can add LUNs concurrently
The only disadvantage is that you have to manage more device files.
LUSE has two goals:
Keep the numbers of LUNs low for larger volumes (Under Windows you need it if you need a big LUN)
You can build LUSE from 2 to 36 LDEVs.
To the Open-LDEVs
For the XP256 the following sizes are available:
OPEN-3 2.4 GB
OPEN-8 7.3 GB
OPEN-9 7.3 GB
OPEN-E 14.5GB
OPEN-K 1.8GB
OPEN-L 36.4GB
OPEN-M 47.1 GB
Also see the XP maual here
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00264181/c00264181.pdf
Cheers
Peter
Hewlett Packard Enterprise International
- Communities
- HPE Blogs and Forum
© Copyright 2019 Hewlett Packard Enterprise Development LP