On 09/21/2012 04:46 AM, Alon Bar-Lev wrote:
Adding Doron,

I found one reason - if local repository files are updated, and hashes needs to 
be re-generated.

Alon


Running 'yum clean expire-cache' seems like a more efficient way to accomplish this. I'd hope that in a typical "install os, install vdsm" scenario we wouldn't need a more heavy-handed cleanup.

Greg

----- Original Message -----
From: "Mark Wu" <wu...@linux.vnet.ibm.com>
To: "Douglas Schilling Landgraf" <dougsl...@redhat.com>
Cc: "VDSM Project Development" <vdsm-devel@lists.fedorahosted.org>
Sent: Friday, September 21, 2012 11:41:57 AM
Subject: [vdsm] Why do we need clean yum cache during bootstrap?

Hi Douglas,

Why do we need clean yum cache before installing packages during host
installation?  It could cause a ssh timeout somtimes.  On my test VM,
it
needs several minutes do download yum metatada. Please see the test
below:

[root@host1 tmp]# time yum update qemu-kvm
Loaded plugins: langpacks, presto, refresh-packagekit
fedora/metalink
| 8.6 kB     00:00
fedora
| 4.2 kB     00:00
fedora/primary_db
|  14 MB     00:11
fedora/group_gz
| 434 kB     00:00
ovirt-nightly
| 1.3 kB     00:00
ovirt-nightly/primary
|  31 kB     00:00
ovirt-stable
| 1.3 kB     00:00
ovirt-stable/primary
|  15 kB     00:00
updates/metalink
| 4.6 kB     00:00
updates
| 4.7 kB     00:00
updates/primary_db
| 5.9 MB     03:28
updates/group_gz
| 434 kB     00:21
ovirt-nightly
183/183
ovirt-stable
69/69
No Packages marked for Update

real    4m33.527s
user    0m5.741s
sys    0m0.772s

[root@host1 tmp]# time yum update qemu-kvm
Loaded plugins: langpacks, presto, refresh-packagekit
No Packages marked for Update

real    0m1.184s
user    0m1.048s
sys    0m0.115s


Thanks!
Mark

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