- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- VA7100 - Lun creation?
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
тАО02-25-2003 05:44 PM
тАО02-25-2003 05:44 PM
Thanks! Points will be given!
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-25-2003 07:18 PM
тАО02-25-2003 07:18 PM
Solution1> Hope you have two paths to the array. This will let you alternate which is primary path for each LUN (in LVM, not in the array), for quasi-load-balancing.
2> Assign primary paths through controller 1 for LUNs created in RG1 (raid group 1), and primary paths through controller 2 for LUNs created in RG2. LUNs can be seen and accessed through either controller, but by the book you get better performance if you match them up this way.
3> Do not make just one big LUN for a VG. For load balancing reasons noted above, make at least two. Four is probably better, since this array supports lots of LUNs. The reason for at least four (maybe more) is that LVM creates internal structures for I/O, queues and buffers, etc, based on how many "PVs" are assigned to the VG. If you only have a few, you only get a few I/O resources from the OS. You want more than a few for each VG. For busy VGs, go for more than four, do six or eight.
4> Consider LVM striping across the LUNs you use to create a VG. This is done in the lvcreate or lvextend command, stripe size would equal the number of LUNs in the VG. This does 'round robin' I/O through all I/O structures and queues set up for that VG. In other arrays, it spreads I/Os effectively across spindles, but the VA arrays already stripe across all disks, so the benefit is mostly seen by utilizing all I/O structures within your VG.
5> Decide up front if you want Mirrored storage (raid 0/1), or Autoraid mode (current data is kept raid 0/1, old data is migrated to raid-5 when space is needed). If you make LUNs RAID 0/1, you can switch to Autoraid later, but you CAN'T switch from Autoraid LUNs to mirrored LUNs. Whatever you decide, all LUNs will be of this type. For optimal performance (at the cost of space), go mirrored. For optimal storage (at the cost of performance, which is still pretty good for most cases), go with Autoraid LUNs.
There's more, but it's all I have time for. Hopefully others will chime in.
Best Regards, --bmr
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-25-2003 07:29 PM
тАО02-25-2003 07:29 PM
Re: VA7100 - Lun creation?
Check out this thread, it has several helpful ideas for those looking to set up a VA array:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x30e1e822e739d711abdc0090277a778c,00.html
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-26-2003 05:01 AM
тАО02-26-2003 05:01 AM
Re: VA7100 - Lun creation?
A small big correction to what Brian said. If this is a VA7100 there is only a RG. So you can only create Lun's in RG1. To have best performance, you must put the primary paths going through controller 1, otherwise you'll have great impact. Lun's bigger than 200GB are not that advisable, so you could consider to create 2 lun's with 100GB and then create a vg with these 2 disks. Before doing all this, update your firmware to HP18 (let HP do this), as this will protect more your data and increases performance.
Good luck,
Ricardo
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-26-2003 10:49 AM
тАО02-26-2003 10:49 AM
Re: VA7100 - Lun creation?
Brian, it is a VA7100, so there is only one RG...
But thank you both very much for the useful info...I appreciate the quick responses!
Dan
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-27-2003 03:43 PM
тАО02-27-2003 03:43 PM
Re: VA7100 - Lun creation?
Regards, enjoy the easy-use array! --bmr
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-27-2003 05:01 PM
тАО02-27-2003 05:01 PM
Re: VA7100 - Lun creation?
Since 2TB is pretty big, that should not be a problem...
-Vince
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-02-2003 10:26 PM
тАО03-02-2003 10:26 PM
Re: VA7100 - Lun creation?
If you can afford RAID 1+0, then use that, its no risk best performance. The AutoRAID setting might work ok for you but you system is likely to be out of balance. A L-class server can easily over drive a 15-disk array. If the array is too busy, then the AutoRAID policies will suspend, and you???ll end up with a large RAID 5DP IO component ??? this will not be a performance winner.
If you choose the AutoRAID setting, then select the single active hot spare option. If you choose RAID 1+0 only and you???re interested in performance during a failed disk/rebuild scenario, then either 1) limit the total LUN capacity to one disk (36GB) less than the total available capacity, or 2) write a cron script to enable rebuild only during off peak performance times, like the middle of the night. These are only to minimize the performance impact of a failed disk, if that???s not a big worry, then don???t bother with these instructions.
Make a 10MB LUN 0 ??? this makes management in a SAN, if you ever upgrade to one, easier.
The array performance is not affected by LUN count or size. However, managing the performance is easier the fewer LUN you create. Create LUNs that match your application ??? in a logical organization.
Then, using scsictl, manage the HPUX queue depth. This will be very important. A L-Class server can be quite powerful; it may overwhelm a 15 disk array. Your task is to distribute the 40-slot queue to your LUNs. If it???s all a single application, then distribute the 40 queue slots evenly (ignore the management LUN 0). If you have a ???production??? application, and a lower priority application (like test), give more queue slots to the higher priority application.
Think of the ratios as a prioritization scheme. It???s ok to go over 40 by a little. If you???re interested I???ll explain more???.. good luck.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-02-2003 10:29 PM
тАО03-02-2003 10:29 PM
Re: VA7100 - Lun creation?
If you can afford RAID 1+0, then use that, its no risk best performance. The AutoRAID setting might work ok for you but you system is likely to be out of balance. A L-class server can easily over drive a 15-disk array. If the array is too busy, then the AutoRAID policies will suspend, and you???ll end up with a large RAID 5DP IO component ??? this will not be a performance winner.
If you choose the AutoRAID setting, then select the single active hot spare option. If you choose RAID 1+0 only and you???re interested in performance during a failed disk/rebuild scenario, then either 1) limit the total LUN capacity to one disk (36GB) less than the total available capacity, or 2) write a cron script to enable rebuild only during off peak performance times, like the middle of the night. These are only to minimize the performance impact of a failed disk, if that???s not a big worry, then don???t bother with these instructions.
Make a 10MB LUN 0 ??? this makes management in a SAN, if you ever upgrade to one, easier.
The array performance is not affected by LUN count or size. However, managing the performance is easier the fewer LUN you create. Create LUNs that match your application ??? in a logical organization.
Then, using scsictl, manage the HPUX queue depth. This will be very important. A L-Class server can be quite powerful; it may overwhelm a 15 disk array. Your task is to distribute the 40-slot queue to your LUNs. If it???s all a single application, then distribute the 40 queue slots evenly (ignore the management LUN 0). If you have a ???production??? application, and a lower priority application (like test), give more queue slots to the higher priority application.
Think of the ratios as a prioritization scheme. It???s ok to go over 40 by a little. If you???re interested I???ll explain more???.. good luck.