Commit 8ad6eb62 authored by Kelly L. Rowland's avatar Kelly L. Rowland

update cori-scratch.md

parent 0a2f6299
......@@ -2,3 +2,29 @@ Cori has one scratch file system named `/global/cscratch1` with 30 PB
disk space and >700 GB/sec IO bandwidth. Cori scratch is a Lustre
filesystem designed for high performance temporary storage of large
files. It contains 10000+ disks and 248 I/O servers (OSSs/OSTs).
The `/global/cscratch1` file system should always be referenced using
the environment variable `$SCRATCH` (which expands to
`/global/cscratch1/sd/YourUserName`). The scratch file system is available
from all nodes (login, MOM, and compute nodes) and is tuned for high
performance. We recommend that you run your jobs, especially data
intensive ones, from the burst buffer or the scratch file system.
All users have 20 TB of quota for the scratch file system. If your
`$SCRATCH` usage exceeds your quota, you will not be able to submit batch
jobs until you reduce your usage. The batch job submit filter checks the
usage of `/global/cscratch1`.
The `myquota` command will display your current usage and quota. NERSC
sometimes grants temporary quota increases for legitimate purposes. To
apply for such an increase, please use the
[Disk Quota Increase Form](http://www.nersc.gov/users/storage-and-file-systems/file-systems/data-storage-quota-increase-request/).
The scratch file system is subject to purging. Files in your `$SCRATCH`
directory that are older than 12 weeks (defined by last access time) are
removed. Please make sure to back up your important files (e.g. to HPSS).
Instructions for HPSS are [here](https://docs.nersc.gov/filesystems/archive/).
To restore deleted or purged files, please refer to
[Backup/Restore on Home directory](https://docs.nersc.gov/filesystems/global-home/#backups)
or [Projects directory](https://docs.nersc.gov/filesystems/project/).
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