Storage5k

Grid'5000 storage resources

Sites	VM Name	Disk partition	Size	status
Sophia	stock.sophia.grid5000.fr	/dev/sda	2000 GB
Grenoble
Lille
Lyon
Nancy
Orsay
Rennes
Bordeaux
Toulouse

Purpose

This page presents ways to use storage5k for the storage reservation in Grid'5000.

Overview

Each user has a default storage space (/home) exported via NFS. For larger storage needs, a user can book another storage space for a determined period. storage5k allows users to book resources with OAR types of "storage".

Usage

First check the chunk disk size of the oar storage resources

malachheb@fsophia:~$ storage5k -a chunk_size
Chunk size: 10737418240 (10 GB)

In this example the chunk size is 10GB, so for a reservation of 100 GB, you should ask for 10 chunks.

Storage reservation

A storage reservation is an oar job with the resources type is "storage". you can submit a storage reservation with two way:

 with storage5k command:
 malachheb@fsophia:~$ storage5k -a add -l chunks=2,walltime=2
 [ADMISSION RULE] Modify resource description with type constraints
 [ADMISSION RULE] Modify resource description as storage
 Generate a job key...
 OAR_JOB_ID=648
 Reservation mode : waiting validation...
 Reservation valid --> OK

 with oarsub command:
 malachheb@fsophia:~$ oarsub -t deploy -l chunks=2,walltime=2 -r "2011-12-09 11:57:00"
 [ADMISSION RULE] Modify resource description with type constraints
 [ADMISSION RULE] Modify resource description as storage
 Generate a job key...
 OAR_JOB_ID=649
 Reservation mode : waiting validation...
 Reservation valid --> OK

	Note
	A reservation can take a few minutes if the space is too large, due to the initialization of the reserved partition in the storage server.

	Warning
	you can not submit a storage reservation simultaneously with compute nodes or other oar resources (vlan, subnet)

check your Storage reservation

Each storage reservation is identified by the job cpuset_name (e.g, malachheb_649), to displya the details of your reservations, you can use "storage5k -a info".

  malachheb@fsophia:~$ storage5k -a info 
  storage5k 1.0.0
  Job_Id: 648
   State: Running
   Reservation Id: malachheb_648
   Chunks: 2
   Chunks_size: 10737418240
   Space reserved: 21474836480
   Data Directory: /data/malachheb_648
   Free space: 20018364416
   Used space: 1119879168
   Source nfs: stock.sophia.grid5000.fr:/data/malachheb_648

Also you can use "oarstat" to display your job related to the storage reservation

Each reservation is mounted by default in the directory "/data/" (e.g, /data/malachheb_648). You can make a soft link for this directory in your home.