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тАО07-20-2005 02:16 PM
тАО07-20-2005 02:16 PM
We have an admin that left our company and this person used distributed striping vs KB striping.
We understand how you set it up and how to tell if it is setup, but we need to know WHY you would use distributed stripes vs KB Stripes? The servers involved are N-Class and attached to an XP512.
Solved! Go to Solution.
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тАО07-20-2005 06:06 PM
тАО07-20-2005 06:06 PM
Re: Why use distributed stripes vs KB Stripes
1. You can mirror extent based striping, you can't mirror 'normal striping'. Not much of an issue on a disk array like an XP, but might come in handy if and when you migrate to another array.
2. With normal striping, if you were striped across 10 LUNs, and you used all the available extents on those LUNs, when you wanted to extend the LVs, you would need to add another 10 LUNs to the VG to let you do it!. With extent based striping you could add as few as 2 extra LUNs and extend the LV. Of course you might get different performance characteristics for that bit of the LV, but at least you have the flexibility to do it.
HTH
Duncan
I am an HPE Employee
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тАО07-21-2005 12:45 AM
тАО07-21-2005 12:45 AM
Re: Why use distributed stripes vs KB Stripes
Thanks for the info, and I do have a follow up question to clarify. Our current setup from VGxx is:
--- Physical volume groups ---
PVG Name PVG0
PV Name /dev/dsk/c14t13d3
PV Name /dev/dsk/c12t13d4
PV Name /dev/dsk/c13t13d4
PV Name /dev/dsk/c15t13d5
PV Name /dev/dsk/c14t13d5
PV Name /dev/dsk/c12t13d6
PV Name /dev/dsk/c13t13d6
PV Name /dev/dsk/c15t13d7
PV Name /dev/dsk/c14t13d7
PV Name /dev/dsk/c12t14d0
PV Name /dev/dsk/c13t14d0
PV Name /dev/dsk/c15t14d1
PV Name /dev/dsk/c14t14d1
PV Name /dev/dsk/c12t14d2
PV Name /dev/dsk/c13t14d2
Then the lvol looks like this:
Bad block NONE
Allocation PVG-strict/distributed
IO Timeout (Seconds) default
--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c14t13d3 1667 1667
/dev/dsk/c12t13d4 1667 1667
/dev/dsk/c13t13d4 1667 1667
/dev/dsk/c15t13d5 1667 1667
/dev/dsk/c14t13d5 1667 1667
/dev/dsk/c12t13d6 1667 1667
/dev/dsk/c13t13d6 1667 1667
/dev/dsk/c15t13d7 1667 1667
/dev/dsk/c14t13d7 1667 1667
/dev/dsk/c12t14d0 1667 1667
/dev/dsk/c13t14d0 1666 1666
/dev/dsk/c15t14d1 1666 1666
/dev/dsk/c14t14d1 1666 1666
/dev/dsk/c12t14d2 1666 1666
/dev/dsk/c13t14d2 1666 1666
What I was told, is when we run out of space to extend this particular lvol, we would have to add 15 more luns to the VG/PVG to accomplish and extend. You mentioned, with the caution of a potential change in performance, that we could just add 2 more luns vs 15 more to do the extend. From what you see with our setup, is that still true??
Thanks for the help!
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тАО07-21-2005 01:04 AM
тАО07-21-2005 01:04 AM
Re: Why use distributed stripes vs KB Stripes
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тАО07-21-2005 01:17 AM
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тАО07-21-2005 01:40 AM
тАО07-21-2005 01:40 AM
Re: Why use distributed stripes vs KB Stripes
That helps clarify. One final thing for you or anyone else following this post.
Can anyone point us to any of these papers that discuss or recommend extent based stripes with large arrays that John was talking about???
Thanks!
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тАО07-21-2005 01:42 AM
тАО07-21-2005 01:42 AM
Re: Why use distributed stripes vs KB Stripes
Assuming your ITRC ID is linked to an active support contract, you should be able to view this:
http://www4.itrc.hp.com/service/iv/docDisplay.do?docId=prodITRC/DE_SW_UX_swrec_EN_01_E/XP-DiskArrays.pdf
HTH
Duncan
I am an HPE Employee
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тАО07-21-2005 01:46 AM
тАО07-21-2005 01:46 AM
Re: Why use distributed stripes vs KB Stripes
It looks like this link if for the European site. Do you know how I can make this work for the Americas site OR would you be able to send it as an attachment to the forum or is it too big?
Thanks!
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тАО07-21-2005 01:52 AM
тАО07-21-2005 01:52 AM
Re: Why use distributed stripes vs KB Stripes
1. Log in to ITRC
2. Under " maintenance and support (hp products)", I select 'navigate knowledge trees'
3. Under HP-UX select "HP-UX Software Recovery Handbook"
4. "Chapter 26 - XP Disk Arrays"
I can't post protected material here - a forum moderator would just remove it.
HTH
Duncan
I am an HPE Employee
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тАО07-21-2005 02:39 AM
тАО07-21-2005 02:39 AM
Re: Why use distributed stripes vs KB Stripes
Thanks for all your help!!!!
We actually had a contractor in that setup a login the the European Site a long time ago and he got it for me.
Thanks Again!!
Ryan