A review of configuration requirements tips and tricks by Carlos Galeona for scale out NAS.
Cluster with OneFS ranging in size of filesystem from 18TB to 15.5 PB that's easy to manage with no RAIDs, LUNs, etc. and easy to grow is the target of the configuration. Minimum system configuration is a cluster with three nodes, two infiniband switches, the same version of OneFS, licenses for different modules. Common tasks involve upgrade, deployment, verification etc. cfengine deployment for host, and cfagent runs from cron for each node is the practice. Management API exists for OneFS 7.1.1  A traditional backup is an example use case. An NFS file system is mounted to a backup server or client and then a native backup is done. A large scale file system could mean multiple backups and parallel tree traversals.  The latter can take a long time. 7.1.1 API allows the creation of changelist that addresses latter.

Sample program to create a web API based administration session, create an NFS export and create a snapshot.

# import relevant libraries
import json
import urllib
#  for data = urllib.urlopen(url, params).read()
import httplib2
http = httplib2.Http()

# for http.request(url) instead of authenticated urlopen

# setup
api_user = 'Your api username'
api_pass = 'Your api password'

# create session

url = 'https://<cluster-ip-or-host-name>:8080/session/1/session'
params = urllib.urlencode({
'username': api_user,
'password': api_pass,
'services': ['NFS','Snapshot']
})
http.add_credentials(api_user, api_pass)
response, content = http.request(url, 'POST', params,
headers={'Content-type': 'application/x-www-form-urlencoded'}
)

# validate
url = url + '?isisessid'
http.add_credentials(api_user, api_pass)response,content = http.request(url)
data = json.loads(content.json())
if data["username"] != api_user:
   raise Error('bad session')

#create nfs export
url = 'https://<cluster-ip-or-host-name>:8080/platform/1/protocols/nfs/exports'
params = urllib.urlencode({
'description': 'sample mount',
'paths': ['/path','/path1'] # under /ifs
})
http.add_credentials(api_user, api_pass)
response, content = http.request(url, 'POST', params,
headers={'Content-type': 'application/x-www-form-urlencoded'}
)
data = json.loads(content.json())
if not data["id"] :
   raise Error('bad export')

# validate
id = data['id']
url = 'https://<cluster-ip-or-host-name>:8080/platform/1/protocols/nfs/exports/' + id + '?describe'
http.add_credentials(api_user, api_pass)
response,content = http.request(url)
data = json.loads(content.json())
if not data["id"] :
   raise Error('bad export')

#create a snapshot
url = 'https://<cluster-ip-or-host-name>:8080/platform/1/snapshot/snapshots'
params = urllib.urlencode({
'name': 'sample snapshot',
'path': '/ifs'
})
http.add_credentials(api_user, api_pass)
response, content = http.request(url, 'POST', params,
headers={'Content-type': 'application/x-www-form-urlencoded'}
)
data = json.loads(content.json())
if not data["id"] :
   raise Error('bad snapshot')

# validate
id = data['id']
url = 'https://<cluster-ip-or-host-name>:8080/platform/1/snapshot/snapshots/' + id + '?describe'
http.add_credentials(api_user, api_pass)
response,content = http.request(url)
data = json.loads(content.json())
if not data["created"] :
   raise Error('bad snapshot')

from datetime import datetime, timedelta
createddate = datetime.strptime(data['created'])
if  datetime.now  - createddate >  timedelta(hours=2):
    raise Error('old snapshot')

#coding exercise
Given a non-negative number represented as an array of digits, plus one to the number.

void plusOne(ref List<int> digits, int position)

{
if (position  >= digits.Length) return;
If (position < 0) return;
if (digits[position] + 1 > 9)
{
   digits [position] = 0;
if (position - 1 < 0) {// check INT_MIN underflow; digits.InsertAt(0, 1);}
Else
   plusOne(ref digits, position - 1);
}
else
    digits[position] += 1;
}