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Re: [HTCondor-users] Tier 3 hardware requirements


What experiment will you be serving as a T3? The most accurate hardware 
recommendations will come from the experiments themselves as they know 
the requirements for their workflows. For example, CMS has Tier-3 
suggestions publicly available: 
Additionally, are you interested in serving multiple experiments and/or 
local users?

That being said, we can provide some pointers for running a generic 
HTCondor pool.


For a minimal HTCondor pool, you probably need at least the following 
kinds of services:

* A central manager
* Some submit points
* Many execute nodes
* Perhaps some other helpful services

Especially for a smaller site, it may be possible to combine things like 
the central manager and one submit point on a single node. Likewise, 
other services can often be combined if lightly used.

Rather than any specific hardware suggestions, below are some ratios to 
think about when planning hardware for a site:

Central manager:

The minimum requirements here are fairly small. For a cluster of about 
10,000 job slots, maybe 1 GB RAM is sufficient.

Submit point:

* Reserve 2 MB RAM for every job slot in the pool. For example, if your 
pool has 1000 slots, consider at least 2 GB RAM.

* An additional 3-4 GB RAM per average active user on the submit host. 
That is to say, if you have 10 logged-in users on average, you might 
want 40 GB RAM. Users often do interactive tasks that may use surprising 
amounts of memory.

* 50 GB working storage space (in home or scratch, e.g.) per user on the 
submit node. An SSD is preferable here.

Execute nodes:

* At least 2 GB per compute core is a good starting point (and is a 
minimum for ATLAS workloads).

* At least 10 GB of disk per job slot.

Other services to consider:
* Squid - a caching proxy for file transfers
* XCache - another file caching system
* perfSONAR - used to measure, record, and report networking performance 

- Brian

On 10/3/19 8:52 AM, Alejandro AcuÃa wrote:
> Dear Users
> I need Tier 3 hardware minimal requirements nowadays. Does anyone know 
> where I can find them?
> Thanks,
> Ale
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