- Community Home
- >
- Storage
- >
- Midrange and Enterprise Storage
- >
- StoreVirtual Storage
- >
- P4500 Snapshot Question
StoreVirtual Storage
1753810
Members
7938
Online
108805
Solutions
Forums
Categories
Company
Local Language
юдл
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
Forums
Discussions
юдл
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
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
тАО10-30-2010 04:31 AM
тАО10-30-2010 04:31 AM
P4500 Snapshot Question
Hello,
Apologies for what may be a simple post, but I'm new to LeftHand storage SANs and have not as yet had any training.
When my SAN takes a Snapshot is it the entire size of the volume rather than just what data is being used? Is there a way to configure the Snapshot to only save files that have changed since my current Snapshot data size is 5 times the volume size.
Finally when I delete all of the Snapshots my volume used space increases - why?
The reason for these questions is that IтАЩm constantly running out of space on my SAN тАУ often itтАЩs at 99% capacity.
Thanks for any help!
Apologies for what may be a simple post, but I'm new to LeftHand storage SANs and have not as yet had any training.
When my SAN takes a Snapshot is it the entire size of the volume rather than just what data is being used? Is there a way to configure the Snapshot to only save files that have changed since my current Snapshot data size is 5 times the volume size.
Finally when I delete all of the Snapshots my volume used space increases - why?
The reason for these questions is that IтАЩm constantly running out of space on my SAN тАУ often itтАЩs at 99% capacity.
Thanks for any help!
2 REPLIES 2
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО10-31-2010 12:28 AM
тАО10-31-2010 12:28 AM
Re: P4500 Snapshot Question
Hello Anne,
if you delete a snapshot, the data is written to the source volume. In this case you source volume can grow.
Regards,
Patrick
if you delete a snapshot, the data is written to the source volume. In this case you source volume can grow.
Regards,
Patrick
Best regards,
Patrick
Patrick
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО10-31-2010 07:57 AM
тАО10-31-2010 07:57 AM
Re: P4500 Snapshot Question
When a new snapshot is taken, no data is "copied" (other than rollups for snapshots being deleted). The newest volume contains only data that changes 'after' the snapshot took place.
If you have a volume with heavy change rates (like a database with a ever-changing transaction log) you can cause each delta (snapshot) to consume a significant volume of space.
With these volumes you may want to employ a different snapshot strategy depending on what you are trying to protect from.
For example, you could perform frequent hourly snapshots, but only keep the last 3-4 snapshots. This would keep the size down, yet still allow you to recover from a corruption problem if identified quickly.
In addition to that you could perform a daily snapshot, but only keep them for 2 days (realize the delta size from yesterday, to an hourly 24 hours later could be significant if you have a high change rate)
When you delete a snapshot the CMC incorrectly reports the data being consumed twice: Once on the snapshot being deleted, and once on the snapshot it is being rolled into. I've noticed that when I query using SNMP commands via Nagios (http://www.tdonline.com/training/lefthand/)
It properly reports the size, and doesn't show the extra usage, The CMC can often actually show a negative amount of space available, so clearly the CMC has some bugs in the reporting method.
http://www.tdonline.com
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