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Speeding up a restore

by dinesh4321 » Thu Mar 26, 2015 2:19 pm

While doing restore on our test environment(Version:8) for 4.5 TB backup. Its taking around 4-5 days to complete the restore.

Is there any process that we need to do before starting RESTORE, so that the restore will be more efficient?
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Re: Speeding up a restore

by markc » Fri Mar 27, 2015 1:44 pm

Typically you would just commission the system prior to restoring to it, which I presume you have done.

For further investigation we'd need a lot more information including the following. Be wary of posting any company confidential information on this public forum though - if that is an issue, consider using a support portal account to raise a case with the relevant information, as that would then only be available to Kognitio employees and other users from your company. If you don't have such access, you can request it via email to helpdesk at kognitio dot com, indicating which company you work for, what you are attempting, whether you are a customer or prospect, etc.
  • if you normally use an imaging script rather than "create image" to recreate RAM images, did you switch off image creation in the restore? If not, a lot of that restore time might be recreating images in a suboptimal order without e.g. creating intermediate images which an imaging script would do.
  • did you switch off SSL for the DSN used for restore - this can speed up restore significantly as noted in the topic at http://kognitio.com/forums/viewtopic.php?f=2&t=262
  • the specification of the target platform in terms of number of nodes, number of disk resources, etc. A simple way to provide these would be to tar up /var/log/wx2 contents and provide the resulting file.
  • more information on the restore size - if the 4.5TB backup the size including compressed data, in which case this will result in far more than 4.5TB of data being restored.
  • details of connectivity between the restore client and the target system - typically the restore would be run from the AP of a system, which would have high bandwidth, low latency connectivity to the server nodes. To test this you could do a file transfer with netcat between the machine you ran restore from and one of the IP addresses used in the DSN for the restore target, and report back on the performance seen.
  • evidence of restore progress from e.g. the restore log.
  • if Kognitio have access to the systems concerned, please provide details of an IP address for the restore target, and the restore client, where the backup to be restored can be found, and any other relevant information so we can investigate further
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Re: Speeding up a restore

by dinesh4321 » Thu Apr 02, 2015 2:52 pm

Thanks mark.
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