Hammer mirror-copy issue

[Tim Darby <t+dfbsd@xxxxxxxxxxxx>]

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I just had a hammer mirror-copy operation complete, without errors, but
when I started comparing the two PFSes, I found files in the source that
were missing in the destination.  How could that happen?

Here's the details:

I had a drive that was mirror streaming its PFS 0 to another drive's PFS 1
for backup.  The filesystem on the primary became corrupt (lots of CRC
errors and I still don't know how that happened), so I:

- Verified that the files on the backup drive were good
- Stopped the mirror stream
- Successfully did a pfs-upgrade on the backup drive's PFS 1
- Formatted the primary drive and created a PFS 1 on it slaved to the
backup drive's PFS 1
- Started a mirror-copy from the backup drive's PFS 1 to the main drive's
PFS 1

A
=E2=80=8Bny ideas on how the mirror-copy could have skipped some of the fil=
es?=E2=80=8B


Tim

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:trebuche=
t ms,sans-serif;font-size:small">I just had a hammer mirror-copy operation =
complete, without errors, but when I started comparing the two PFSes, I fou=
nd files in the source that were missing in the destination. =C2=A0How coul=
d that happen?</div>

<div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;f=
ont-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family=
:trebuchet ms,sans-serif;font-size:small">Here&#39;s the details:</div><div=
 class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;font-=
size:small">

<br></div><div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sa=
ns-serif;font-size:small">I had a drive that was mirror streaming its PFS 0=
 to another drive&#39;s PFS 1 for backup. =C2=A0The filesystem on the prima=
ry became corrupt (lots of CRC errors and I still don&#39;t know how that h=
appened), so I:</div>

<div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;f=
ont-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family=
:trebuchet ms,sans-serif;font-size:small">- Verified that the files on the =
backup drive were good</div>

<div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;f=
ont-size:small">- Stopped the mirror stream</div><div class=3D"gmail_defaul=
t" style=3D"font-family:trebuchet ms,sans-serif;font-size:small">- Successf=
ully did a pfs-upgrade on the backup drive&#39;s PFS 1=C2=A0</div>

<div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sans-serif;f=
ont-size:small">- Formatted the primary drive and created a PFS 1 on it sla=
ved to the backup drive&#39;s PFS 1</div><div class=3D"gmail_default" style=
=3D"font-family:trebuchet ms,sans-serif;font-size:small">

- Started a mirror-copy from the backup drive&#39;s PFS 1 to the main drive=
&#39;s PFS 1=C2=A0</div><div><br></div>A<div class=3D"gmail_default" style=
=3D"font-family:&#39;trebuchet ms&#39;,sans-serif;font-size:small;display:i=
nline">

=E2=80=8Bny ideas on how the mirror-copy could have skipped some of the fil=
es?=E2=80=8B</div><br clear=3D"all"><div><div><br></div>Tim</div>
</div>

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