====== Storage ======

This page aims to collect useful information on the different options for storage on PSI's T3 and the ''lxplus'' cluster. [under construction]

 ===== T3 scratch area =====

Each user and working node (''t3ui*'' and ''t3wn*'') has its own scratch area. which should only be used for temporary storage, because it is not backed-up. For longer storage of large files, please use [[#t3_storage_element|T3's storage element]].

 ===== T3 Storage element =====

For large files, one should always use the T3 storage element. This section summarizes the useful parts of [[https://wiki.chipp.ch/twiki/bin/view/CmsTier3/HowToAccessSe|the TWiki on how To Acces SE]].

 ==== Copying files ====

You can also copy large output files to the storage element using the copy command **''lcg-cp''** or the recommended **''xrdcp''** from XROOTD.

<code bash>
lcg-cp -b -D srmv2 file:foo.root srm://t3se01.psi.ch:8443/srm/managerv2?SFN=/pnfs/psi.ch/cms/trivcat/store/user/$USER/analysis/$OUTFILE
</code>

or

<code bash>
xrdcp -f foo.root root://t3dcachedb.psi.ch:1094//pnfs/psi.ch/cms/trivcat/store/user/$USER/analysis
</code>
 ==== Creating directories ====

Note that one can only copy files to existing directories. Create the necessary parent directories (''analysis'' in this example) on your SE home if it doesn't exist yet:
<code>
gfal-mkdir -p gsiftp://t3se01.psi.ch//pnfs/psi.ch/cms/trivcat/store/user/$USER/analysis
</code>
or more generally
<code>
gfal-mkdir -p gsiftp://t3se01.psi.ch/`echo $SERESULTDIR | grep -o '/pnfs/psi.ch/.*'`
</code>

 ==== Mounting the T3 ====

[to be updated]

 ===== T2 Storage element =====
[to be updated]

 ===== Lxplus afs =====
[to be updated]

 ===== Lxplus eos =====
[to be updated]