<div dir="ltr">For our users that have sensitive data, we keep it encrypted at rest and in movement.<div><br></div><div>For HDD-based systems, you can perform a secure erase per NIST standards. For SSD-based systems, the extra writes from the secure erase will contribute to the wear on the drives and possibly their eventually wearing out. Most SSDs provide an option to mark blocks as zero without having to write the zeroes. I do not think that it is exposed up to the PFS layer (Lustre, GPFS, Ceph, NFS) and is only available at the ext4 or XFS layer.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 29, 2021 at 10:15 AM Paul Edmon <<a href="mailto:pedmon@cfa.harvard.edu">pedmon@cfa.harvard.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div>
<p>The former. We are curious how to selectively delete data from a
parallel filesystem. For example we commonly use Lustre, ceph,
and Isilon in our environment. That said if other types allow for
easier destruction of selective data we would be interested in
hearing about it.<br>
</p>
<p>-Paul Edmon-<br>
</p>
<div>On 9/29/2021 10:06 AM, Scott Atchley
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Are you asking about selectively deleting data from
a parallel file system (PFS) or destroying drives after removal
from the system either due to failure or system decommissioning?
<div><br>
</div>
<div>For the latter, DOE does not allow us to send any
non-volatile media offsite once it has had user data on it.
When we are done with drives, we have a very big shredder.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Sep 29, 2021 at 9:59
AM Paul Edmon via Beowulf <<a href="mailto:beowulf@beowulf.org" target="_blank">beowulf@beowulf.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Occassionally
we get DUA (Data Use Agreement) requests for sensitive <br>
data that require data destruction (e.g. NIST 800-88). We've
been <br>
struggling with how to handle this in an era of distributed
filesystems <br>
and disks. We were curious how other people handle requests
like this? <br>
What types of filesystems to people generally use for this and
how do <br>
people ensure destruction? Do these types of DUA's preclude
certain <br>
storage technologies from consideration or are there creative
ways to <br>
comply using more common scalable filesystems?<br>
<br>
Thanks in advance for the info.<br>
<br>
-Paul Edmon-<br>
<br>
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</blockquote>
</div>
</blockquote>
</div>
</blockquote></div>