BlueCrystal Phase 4 Storage¶
There are three main storage areas on BlueCrystal Phase 4:
- Home directories
- Scratch space
- Purchased project space
None of these spaces are backed up. It is the user’s responsibility to ensure critical data are also on a backed-up area, for example the RDSF
Every user gets a home directory with a quota of 20 Gigabytes. This is for source code, application settings, submission scripts etc.
There is also a larger space for each user (with quota of 512 Gigabytes) called “Scratch”.
This is for large input and output datasets. This can be found under
If you find it easier you can create a convenience symlink in your home directory, e.g.:
ln -s /mnt/storage/scratch/$USER scratch
Checking your Quota¶
You can check your quota usage with the command
[mw16387@bc4login1 ~]$ mmlsquota --block-size auto Block Limits | File Limits Filesystem Fileset type blocks quota limit in_doubt grace | files quota limit in_doubt grace Remarks gpfs root USR no limits gpfs home USR 13.63G 19G 20G 0 none | 110793 0 0 0 none gpfs scratch USR 0 510G 512G 320M none | 2 0 0 38 none
The output is a bit confusing. Looking at the left hand block, your usage is in the “blocks” column. The quota column has the soft limit, once you go over that the clock starts ticking on the grace time. The “limit” column is the hard limit once you hit that you cannot write any more data in that space.
There is a line for each of the areas on the system, you can ignore the line for “root” that is an implementation detail.
The right hand half of the display concerns files, this is for information only as the quota is applied by the space used rather than the number of files (a quota of 0 indicates no limit).
The nodes are diskless and therefore the root filesystem is on RAM disk and consequently /tmp is on this ramdisk (Total Size including OS is 20G)
Purchased Project Space¶
Some groups have purchased extra space for their exclusive use. This is mounted
/mnt/storage/private. Your PI can tell you the name of the space you
may have access to.
To enquire about purchasing space please email firstname.lastname@example.org
The default permissions (since November 2017) are to allow user access but not group and others. E.g.
[username@bc4login1 ~]$ ls -ld ~ drwx------ 75 username grp 8192 Oct 31 14:05 /mnt/storage/home/username
You can change the permissions on a file or directory basis by using the
chmod command. You can give members of your group or other additional