b3fb585f58
resolves: rhbz#2021154
Rebase to new stable branch version 1.28.2
resolves: rhbz#2011709
Switch to xorriso (instead of genisoimage)
Upstream prefers it since:
commit 174a0caf7eaf1943360f9d8f714f466ea7449d90
Author: Richard W.M. Jones <rjones@redhat.com>
Date: Sat Apr 3 17:15:34 2021 +0100
iso: Pick xorriso in preference to genisoimage or mkisofs.
See this Debian page explaining the situation with genisoimage:
https://wiki.debian.org/genisoimage
(cherry picked from commit df8ac05e24)
Move nbdkit-null-plugin to the nbdkit-server package
This plugin is required for probing the presence of filters (see
nbdkit-probing(1) man page), so it makes sense to always have it
around. The null plugin is only 16K in size so it does not add
significantly to the nbdkit-server package.
(cherry picked from commit 048b8de83c)
Consistent use of whitespace
Remove double line whitespace between %package and %description.
Also remove whitespace lines within %package sections.
Double line whitespace is kept between subpackages for visual clarity.
(cherry picked from commit 9fbfa6cc49)
85 lines
2.6 KiB
Diff
85 lines
2.6 KiB
Diff
From 4bd9926c0e506fdb04976d348b1c7614865c8b06 Mon Sep 17 00:00:00 2001
|
|
From: "Richard W.M. Jones" <rjones@redhat.com>
|
|
Date: Fri, 22 Oct 2021 18:00:27 +0100
|
|
Subject: [PATCH] vddk: Document troubleshooting performance problems
|
|
|
|
Document how to use -D vddk.stats=1 to diagnose performance problems
|
|
with VDDK.
|
|
|
|
(cherry picked from commit e491978c193f49010cc28ad344d0fb3c1b5ede35)
|
|
---
|
|
plugins/vddk/nbdkit-vddk-plugin.pod | 57 +++++++++++++++++++++++++++++
|
|
1 file changed, 57 insertions(+)
|
|
|
|
diff --git a/plugins/vddk/nbdkit-vddk-plugin.pod b/plugins/vddk/nbdkit-vddk-plugin.pod
|
|
index e53d3286..5a426135 100644
|
|
--- a/plugins/vddk/nbdkit-vddk-plugin.pod
|
|
+++ b/plugins/vddk/nbdkit-vddk-plugin.pod
|
|
@@ -475,6 +475,63 @@ and restarting the C<hostd> service:
|
|
|
|
For more information see L<https://bugzilla.redhat.com/1614276>.
|
|
|
|
+=head2 Troubleshooting performance problems
|
|
+
|
|
+VDDK has very uneven performance with some operations being very slow.
|
|
+This plugin has options to allow you to debug performance issues. If
|
|
+your application has a debug or diagnostic setting, add the following
|
|
+nbdkit command line options:
|
|
+
|
|
+ -v -D nbdkit.backend.datapath=0 -D vddk.datapath=0 -D vddk.stats=1
|
|
+
|
|
+C<-v> enables verbose messages and the two datapath options I<disable>
|
|
+the very verbose per-read/-write messages. C<-D vddk.stats=1> enables
|
|
+a summary when nbdkit exits of the cumulative time taken in each VDDK
|
|
+function, the number of times each function was called, and (for read
|
|
+and write) the number of bytes transferred. An example of what those
|
|
+stats look like can be found here:
|
|
+L<https://gitlab.com/nbdkit/nbdkit/-/commit/5c80f0d290db45a679d55baf37ff39bacb8ce7ec>
|
|
+
|
|
+You can interpret the stats as follows:
|
|
+
|
|
+=over 4
|
|
+
|
|
+=item C<Read>
|
|
+
|
|
+The cumulative time spent waiting for VDDK to return from
|
|
+C<VixDiskLib_Read> calls, the number of times this function was
|
|
+called, and the total bytes read. You can use this to determine the
|
|
+read bandwidth to the VMware server.
|
|
+
|
|
+=item C<Write>
|
|
+
|
|
+=item C<Flush>
|
|
+
|
|
+Same as above, but for writing and flushing writes.
|
|
+
|
|
+=item C<QueryAllocatedBlocks>
|
|
+
|
|
+This call is used to query information about the sparseness of the
|
|
+remote disk. It is only available in VDDK E<ge> 6.7. The call is
|
|
+notably very slow in all versions of VMware we have tested.
|
|
+
|
|
+=item C<Open>
|
|
+
|
|
+=item C<Close>
|
|
+
|
|
+=item C<ConnectEx>
|
|
+
|
|
+=item C<Disconnect>
|
|
+
|
|
+=item C<InitEx>
|
|
+
|
|
+=item C<Exit>
|
|
+
|
|
+The cumulative time spent connecting and disconnecting from the VMware
|
|
+server, which can also be very slow.
|
|
+
|
|
+=back
|
|
+
|
|
=head1 SUPPORTED VERSIONS OF VDDK
|
|
|
|
This plugin requires VDDK E<ge> 5.5.5, which in turn means that it
|
|
--
|
|
2.31.1
|
|
|