- Community Home
- >
- Storage
- >
- Midrange and Enterprise Storage
- >
- StoreVirtual Storage
- >
- Re: VSA Raid Reconfiguration
StoreVirtual Storage
1748131
Members
3676
Online
108758
Solutions
Forums
Categories
Company
Local Language
back
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Discussions
back
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
Blogs
Information
Community
Resources
Community Language
Language
Forums
Blogs
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
- Report Inappropriate Content
06-10-2010 08:35 AM
06-10-2010 08:35 AM
VSA Raid Reconfiguration
Hello,
I have 2 VSA's on HP DL180s using 8 x 1TB disks.
I chose raid 5 using 7 of the 8 disks, leaving one as a hot spare, then carved it up into <2TB luns and presented those to the VSA.
Am I right in assuming that the VSA has now performed a software raid-0 on those luns?
If so I have a feeling that I may have royally shafted performance. Since the VSA's raid 0 is at 90 degrees to the original raid (if you see what I mean). It seems like I might have made continuous reads very difficult.
Since I chose a 7 disk raid 5 usable space ended up being approximately 4.5 tb.
I wonder if I might be better making 4 raid 1 sets on the dl180 then presenting those to the VSA instead. If the VSA is going to do a software raid 0 whatever I do then this should be a far better configuration.
My question is, if I break the VSA cluster and reconfigure 1 node as a smaller unit, will I be able to re-introduce it to the cluster?
I am only using about 1TB of space right now so if when I add the new node the cluster just configures down to the new size that will be fine.
However if a VSA will not add itself to a cluster when it's smaller than the current node size then I am in trouble. Or at least will not be able to reconfigure without downtime.
I have 2 VSA's on HP DL180s using 8 x 1TB disks.
I chose raid 5 using 7 of the 8 disks, leaving one as a hot spare, then carved it up into <2TB luns and presented those to the VSA.
Am I right in assuming that the VSA has now performed a software raid-0 on those luns?
If so I have a feeling that I may have royally shafted performance. Since the VSA's raid 0 is at 90 degrees to the original raid (if you see what I mean). It seems like I might have made continuous reads very difficult.
Since I chose a 7 disk raid 5 usable space ended up being approximately 4.5 tb.
I wonder if I might be better making 4 raid 1 sets on the dl180 then presenting those to the VSA instead. If the VSA is going to do a software raid 0 whatever I do then this should be a far better configuration.
My question is, if I break the VSA cluster and reconfigure 1 node as a smaller unit, will I be able to re-introduce it to the cluster?
I am only using about 1TB of space right now so if when I add the new node the cluster just configures down to the new size that will be fine.
However if a VSA will not add itself to a cluster when it's smaller than the current node size then I am in trouble. Or at least will not be able to reconfigure without downtime.
1 REPLY 1
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
06-10-2010 01:13 PM
06-10-2010 01:13 PM
Re: VSA Raid Reconfiguration
You will not be able to introduce a smaller VSA into your current cluster. imagine it like disks in a RAID set.
The VSA doesnt have a RAID configuration, it uses the underlying RAID configuration of the disks on the ESX host.
One thing to note is if you use a large RAID 5 with SATA disks it is advisable to look at RAID 6. Due to the size of the disks it can take a long time to rebuild the array if there is a disk failure. During this time the likely hood of a disk is higher, due to the array having to deal with production I/O, as well as the rebuild. Maybe something to keep in mind.
Hope this helps
DC
The VSA doesnt have a RAID configuration, it uses the underlying RAID configuration of the disks on the ESX host.
One thing to note is if you use a large RAID 5 with SATA disks it is advisable to look at RAID 6. Due to the size of the disks it can take a long time to rebuild the array if there is a disk failure. During this time the likely hood of a disk is higher, due to the array having to deal with production I/O, as well as the rebuild. Maybe something to keep in mind.
Hope this helps
DC
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.
News and Events
Support
© Copyright 2024 Hewlett Packard Enterprise Development LP