[OpenAFS] Questions about 'vldb_check -fix'

[Kendrick Hernandez]

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Hi,

I have some notes left from a previous admin, that we have some vldb
corruption that can be fixed by running 'vldb_check -fix'. My understanding
is that we need to shut down the vlserver on our 3 db servers, and run this
command on the lowest IP site, bring that up first, and then bring up the
rest.

In order to minimize downtime, I'd like to run vldb_check on an offline
copy of the vldb, but I'm wondering if the vlserver needs to be completely
shutdown prior to making the copy, or if read-only mode would be good
enough? If yes, I would basically bring down the vlserver on two sites,
leaving it running on the site with the lowest ip (which if I understand
correctly would go into read-only mode at this point). Then I'd make a copy
of vldb.db0, run 'vldb_check -fix' on the copy, hand-propagate that out to
the remaining sites, and then bring down the vlserver on the lowest ip site
just before moving the fixed copy into place. I could then bring up the
vlserver on the lowest ip site, and the remaining sites.

Does this sound reasonable? We're looking to migrate our db servers from
1.4 to 1.6 in the future, and if I can fix the vldb corruption this way,
then I could copy the vldb (and other dbs) to the new servers and run
'vldb_check -fix' there, before finally switching over from the last old db
server.

k-


-- 

: Kendrick Hernandez
: UNIX Systems Administrator
: UNIX Systems and Infrastructure
: Division of Information Technology
: University of Maryland, Baltimore County

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<div dir=3D"ltr"><div style>Hi,</div><div style><br></div><div>I have some =
notes left from a previous admin, that we have some vldb corruption that ca=
n be fixed by running &#39;vldb_check -fix&#39;. My understanding is that w=
e need to shut down the vlserver on our 3 db servers, and run this command =
on the lowest IP site, bring that up first, and then bring up the rest.</di=
v>
<div><br></div><div>In order to minimize downtime, I&#39;d like to run vldb=
_check on an offline copy of the vldb, but I&#39;m wondering if the vlserve=
r needs to be completely shutdown prior to making the copy, or if read-only=
 mode would be good enough? If yes, I would basically bring down the vlserv=
er on two sites, leaving it running on the site with the lowest ip (which i=
f I understand correctly would go into read-only mode at this point). Then =
I&#39;d make a copy of vldb.db0, run &#39;vldb_check -fix&#39; on the copy,=
 hand-propagate that out to the remaining sites, and then bring down the vl=
server on the lowest ip site just before moving the fixed copy into place. =
I could then bring up the vlserver on the lowest ip site, and the remaining=
 sites.</div>
<div><br></div><div>Does this sound reasonable? We&#39;re looking to migrat=
e our db servers from 1.4 to 1.6 in the future, and if I can fix the vldb c=
orruption this way, then I could copy the vldb (and other dbs) to the new s=
ervers and run &#39;vldb_check -fix&#39; there, before finally switching ov=
er from the last old db server.</div>
<div><br></div><div>k-</div><div><br></div><div><br></div>-- <br><br>: Kend=
rick Hernandez<br>: UNIX Systems Administrator<br>: UNIX Systems and Infras=
tructure<br>: Division of Information Technology<br>: University of Marylan=
d, Baltimore County
</div>

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