Clarifying Disk Space with 2.6

[Damien Miller]

Could someone clarify the disk space information for 2.6. Table 2 in the installation guide indicates 2.4 TB max size, while the disk space guidelines below it conform to the MBR max of 1.999 TB.  The note above the table indicates that we can change the boot mode of the VM to GPT instead of MBR to accommodate partitions above 2 TB. I'm thinking 2.4 TB is the correct value since we have a 3695 OVA available with that size.  Are the guidelines just out of date in the link provided?  

Can I also get guidance on the 2.6 dedicated PSN disk size.  The same table lists a PSN should have a minimum 300 GB disk for production, up from the 200 GB we have been using.  The OVA on the download page is still 200 GB and lists "recommended for eval, psn or pxgrid".  Should this OVA really be 300 GB now?  Second half of this, when planning 3695 dedicated PSN's, is the disk space guidance the same or do we need 600+ to account for a potential memory dump with 256 GB. 

https://www.cisco.com/c/en/us/td/docs/security/ise/2-6/install_guide/b_ise_InstallationGuide26/b_ise_InstallationGuide_26_chapter_01.html#ID-1417-000000d9

[kthiruve]

Damien,

Not sure I understand what is the problem in question number 1. Is that not working? or Is the documentation needs to be corrected?

For the second question, let me check with Engineering if OVA needs to be changed according to documentation or if this is based on the new s/w and h/w needs.

Thanks

Krishnan

[Damien Miller]

On 1, looks like the guide was corrected already, the references to 1.999TB are gone now.

Definitely would like clarification on recommended disk space for PSN's. I believe there are some technical limitations around memory dumps today since they dump on to /localdisk (undersized and fixed space). But if that was corrected, even the new 300 GB recommendation in the 2.6 admin guide doesn't seem sufficient for a 256 GB memory VM.

There seems to be some confusion right now, the admin guide recommends minimum 300 GB for production PSNs, but the OVA's are still 200 GB. If we follow the recommendations we are manually building all the VM's from ISO anyways right now. If we are building these now it would be nice to right size the disk on them the first time. For example, maybe a 3695 PSN should have 600 GB rather than 300.

[Jason Kunst]

Damien great info will get back with you

[hslai]

On 1, looks like the guide was corrected already, the references to 1.999TB are gone now.

That is correct. That appears some glitches in our tech doc publication, as I reviewed this when ISE 2.6 released.

Definitely would like clarification on recommended disk space for PSN's. I believe there are some technical limitations around memory dumps today since they dump on to /localdisk (undersized and fixed space). But if that was corrected, even the new 300 GB recommendation in the 2.6 admin guide doesn't seem sufficient for a 256 GB memory VM.

There seems to be some confusion right now, the admin guide recommends minimum 300 GB for production PSNs, but the OVA's are still 200 GB. If we follow the recommendations we are manually building all the VM's from ISO anyways right now. If we are building these now it would be nice to right size the disk on them the first time. For example, maybe a 3695 PSN should have 600 GB rather than 300.

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We are still in discussion on this. AFAIK the more file system space allocation is mainly to accommodate ISE patches.

Only SNS 3695 specs have 256-GB RAM. I am guessing you are suggesting to use a VM large with SNS-3695-specs of CPU and RAM but a smaller disk space. Even so, it should be rare for ISE to dump the whole VM memory.

[Damien Miller]

Yes, that's what I was trying to determine. Instead of a 3695 spec with the listed 300 GB recommended minimum dedicated PSN disk space, should we be future proofing with 600 GB.

[hslai]

CSCvp83494 is a known enhancement on this.

I've passed on your comments to our engineering teams.

[cvcucooper]

I would love to get an answer about the psn recommeded disk size as well.  In a medium deployment with admin & mnt on one node and psn on it's own node is 200 Gb enough space for the psn?