Using a RAMdisk
Re: Using a RAMdisk
You are right, BanditBBS. One more file to change if using RAM disk. We will have to add it to the documentation.
Be sure to check out our Knowledgebase for helpful articles and solutions!
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Box293
- Too Basu
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Re: Using a RAMdisk
Yes, rolling back the RAMDisk setup is not a problem at all.WillemDH wrote:Hey Bandit,
I'm not (yet) using Nagios Mobile. Thanks for the tip though! Could someone from Nagios support answer this question:
GrtzSome questions: Is it possible to rollback the RAMdisk setup? I noted all original configurations, so if I reconfigured everything like it was, it should just start working again without RAMdisk?
Willem
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Re: Using a RAMdisk
Hey Troy,
Thanks for your input. Until now it seems using a RAMdisk did not really help performance at all. It seems my Nagios production server is suffering from serious cpuwait issues since a few days, while there weren't any big changes lately on the Nagios box. I found that the cause of the high cpuwait and as a consequence also cpu load are vmotions in VMware. every time a colleague is doing a storage vmotion of any vm, the cpuwait and cpu load is tripled on the Nagios box. I did not see the same behaviour on similar vm's, so my guess it that the Nagios XI server is very sensible for storage vmotions.
Our SAN consists of several tiers. The Nagios vm is on a datastore on the highest tier. (T1) that consists of Nearline SAS RAID 5 (7200rpm) and FC RAID 6 (15000rpm).
We are not yet sure what to do with this. Any suggestion, (with exception of buying SSD's, as our 'big city' has no mulla for that atm
) is welcome. I fear we almost reached the limit of our Nagios server with our current storage hardware?
Grtz
Willem
Thanks for your input. Until now it seems using a RAMdisk did not really help performance at all. It seems my Nagios production server is suffering from serious cpuwait issues since a few days, while there weren't any big changes lately on the Nagios box. I found that the cause of the high cpuwait and as a consequence also cpu load are vmotions in VMware. every time a colleague is doing a storage vmotion of any vm, the cpuwait and cpu load is tripled on the Nagios box. I did not see the same behaviour on similar vm's, so my guess it that the Nagios XI server is very sensible for storage vmotions.
Our SAN consists of several tiers. The Nagios vm is on a datastore on the highest tier. (T1) that consists of Nearline SAS RAID 5 (7200rpm) and FC RAID 6 (15000rpm).
We are not yet sure what to do with this. Any suggestion, (with exception of buying SSD's, as our 'big city' has no mulla for that atm
) is welcome. I fear we almost reached the limit of our Nagios server with our current storage hardware? Grtz
Willem
Nagios XI 5.8.1
https://outsideit.net
https://outsideit.net
Re: Using a RAMdisk
Hurray,
I seem to have found the problem! It seems somewhere in our Fujitsu Eternus DX8700 a mistake was made by a colleague. The result was that the 'Tier' 1 datastore was actually not a 'Tier 1' datastore but a 'Tier2' that resides on AST SAN consisting of 1TB SATA 7200rpm R6 disks and 300 GB SAS 15000rpm R5.
We migrated the server to a real 'Tier 1' datastore which consists of 300 GB SAS 15000rpm R5 and 400 GB SSD's.
As it seems my Nagios server was on the wrong tier since Januari, it's impossible to say if the RAMdisk really helped and how much unless I would rollback the changes, but I don't really have time for that now considering I just lost one and a half day troubleshooting this...
Grtz
Willem
I seem to have found the problem! It seems somewhere in our Fujitsu Eternus DX8700 a mistake was made by a colleague. The result was that the 'Tier' 1 datastore was actually not a 'Tier 1' datastore but a 'Tier2' that resides on AST SAN consisting of 1TB SATA 7200rpm R6 disks and 300 GB SAS 15000rpm R5.
We migrated the server to a real 'Tier 1' datastore which consists of 300 GB SAS 15000rpm R5 and 400 GB SSD's.
As it seems my Nagios server was on the wrong tier since Januari, it's impossible to say if the RAMdisk really helped and how much unless I would rollback the changes, but I don't really have time for that now considering I just lost one and a half day troubleshooting this...
Grtz
Willem
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Nagios XI 5.8.1
https://outsideit.net
https://outsideit.net
Re: Using a RAMdisk
I'm glad you got that figured out, good troubleshooting! Do you want us to leave this open for a few days or should we lock it up?