ATLAS CCRC storage requirements

For those of you reading the ScotGrid blog, you will have seen this already. Namely, that SRMv2 writing during CCRC (which started yesterday!) will happen using the atlas/Role=production VOMS role. Therefore sites should restrict access to the ATLASMCDISK and ATLASDATADISK space tokens to this role. To do this, release and then recreate the space reservation:

# dpm-releasespace --token_desc ATLASDATADISK
# dpm-reservespace --gspace 10T --lifetime Inf --group atlas/Role=production --token_desc ATLASDATADISK

Note that at Edinburgh I set up a separate DPM pool that was only writable by atlas, atlas/Role=production and atlas/Role=lcgadmin. When reserving the space, I then used the above command but also specified the option "--poolname EdAtlasPool" to restrict the space reservation to that pool (I also only gave them 2TB ;)

Also, for those interested, here's the python code (make sure you have DPM-interfaces installed and /opt/lcg/lib/python in yout PYTHONPATH).

#! /usr/bin/env python
#
# Greig A Cowan, 2008
#

import dpm

def print_mdinfo( mds):
    for md in mds:
        print 's_type\t', md.s_type
        print 's_token\t', md.s_token
        print 's_uid\t', md.s_uid
        print 's_gid\t', md.s_gid
        print 'ret_pol\t', md.ret_policy
        print 'ac_lat\t', md.ac_latency
        print 'u_token\t', md.u_token
        print 't_space\t', md.t_space
        print 'g_space\t', md.g_space
        print 'pool\t', md.poolname
        print 'a_life\t', md.a_lifetime
        print 'r_life\t', md.r_lifetime, '\n'

print '################'
print '# Space tokens #'
print '################'

tok_res, tokens = dpm.dpm_getspacetoken('')

if tok_res > -1:
    md_res, metadata = dpm.dpm_getspacemd( list(tokens) )
    if md_res > -1:
        print_mdinfo( metadata)