[PATCH v4 storage 1/1] fix #254: iscsi: add support for multipath iscsi targets
Yuri Konotopov
ykonotopov at gnome.org
Sat Oct 21 11:37:31 CEST 2023
With this patch Proxmox now tries to login to all discovered portals in
case some of them are not logged yet.
In case of multipath configuration when initially configured portal is
missing for some reason Proxmox don't lose iscsi storage now and can
succesfully restore iscsi connection between reboots.
Signed-off-by: Yuri Konotopov <ykonotopov at gnome.org>
---
PVE/Storage.pm | 2 +-
PVE/Storage/ISCSIPlugin.pm | 117 ++++++++++++++++++++++++++++---------
2 files changed, 89 insertions(+), 30 deletions(-)
diff --git a/PVE/Storage.pm b/PVE/Storage.pm
index cec3996..87755ac 100755
--- a/PVE/Storage.pm
+++ b/PVE/Storage.pm
@@ -1433,7 +1433,7 @@ sub scan_iscsi {
die "unable to parse/resolve portal address '${portal_in}'\n";
}
- return PVE::Storage::ISCSIPlugin::iscsi_discovery($portal);
+ return PVE::Storage::ISCSIPlugin::iscsi_discovery([ $portal ]);
}
sub storage_default_format {
diff --git a/PVE/Storage/ISCSIPlugin.pm b/PVE/Storage/ISCSIPlugin.pm
index a79fcb0..b4ab1dd 100644
--- a/PVE/Storage/ISCSIPlugin.pm
+++ b/PVE/Storage/ISCSIPlugin.pm
@@ -18,6 +18,9 @@ use base qw(PVE::Storage::Plugin);
my $ISCSIADM = '/usr/bin/iscsiadm';
$ISCSIADM = undef if ! -X $ISCSIADM;
+# Example: 192.168.122.252:3260,1 iqn.2003-01.org.linux-iscsi.proxmox-nfs.x8664:sn.00567885ba8f
+my $ISCSI_TARGET_RE = qr/^((?:$IPV4RE|\[$IPV6RE\]):\d+)\,\S+\s+(\S+)\s*$/;
+
sub check_iscsi_support {
my $noerr = shift;
@@ -45,11 +48,12 @@ sub iscsi_session_list {
eval {
run_command($cmd, errmsg => 'iscsi session scan failed', outfunc => sub {
my $line = shift;
-
- if ($line =~ m/^tcp:\s+\[(\S+)\]\s+\S+\s+(\S+)(\s+\S+)?\s*$/) {
- my ($session, $target) = ($1, $2);
+ # example: tcp: [1] 192.168.122.252:3260,1 iqn.2003-01.org.linux-iscsi.proxmox-nfs.x8664:sn.00567885ba8f (non-flash)
+ if ($line =~ m/^tcp:\s+\[(\S+)\]\s+((?:$IPV4RE|\[$IPV6RE\]):\d+)\,\S+\s+(\S+)\s+\S+?\s*$/) {
+ my ($session_id, $portal, $target) = ($1, $2, $3);
# there can be several sessions per target (multipath)
- push @{$res->{$target}}, $session;
+ my %session = ( session_id => $session_id, portal => $portal );
+ push @{$res->{$target}}, \%session;
}
});
};
@@ -68,42 +72,77 @@ sub iscsi_test_portal {
return PVE::Network::tcp_ping($server, $port || 3260, 2);
}
-sub iscsi_discovery {
- my ($portal) = @_;
+sub iscsi_portals {
+ my ($target, $portal_in) = @_;
check_iscsi_support ();
- my $res = {};
- return $res if !iscsi_test_portal($portal); # fixme: raise exception here?
+ my $res = [];
+ my $cmd = [$ISCSIADM, '--mode', 'node'];
+ eval {
+ run_command($cmd, outfunc => sub {
+ my $line = shift;
- my $cmd = [$ISCSIADM, '--mode', 'discovery', '--type', 'sendtargets', '--portal', $portal];
- run_command($cmd, outfunc => sub {
- my $line = shift;
+ if ($line =~ $ISCSI_TARGET_RE) {
+ my ($portal, $portal_target) = ($1, $2);
+ if ($portal_target eq $target) {
+ push @{$res}, $portal;
+ }
+ }
+ });
+ };
- if ($line =~ m/^((?:$IPV4RE|\[$IPV6RE\]):\d+)\,\S+\s+(\S+)\s*$/) {
- my $portal = $1;
- my $target = $2;
- # one target can have more than one portal (multipath).
- push @{$res->{$target}}, $portal;
- }
- });
+ if ($@) {
+ warn $@;
+ return [ $portal_in ];
+ }
+
+ return $res;
+}
+
+sub iscsi_discovery {
+ my ($portals) = @_;
+
+ check_iscsi_support ();
+
+ my $res = {};
+ for my $portal ($portals->@*) {
+ next if !iscsi_test_portal($portal); # fixme: raise exception here?
+
+ my $cmd = [$ISCSIADM, '--mode', 'discovery', '--type', 'sendtargets', '--portal', $portal];
+ eval {
+ run_command($cmd, outfunc => sub {
+ my $line = shift;
+
+ if ($line =~ $ISCSI_TARGET_RE) {
+ my ($portal, $target) = ($1, $2);
+ # one target can have more than one portal (multipath)
+ # and sendtargets should return all of them in single call
+ push @{$res->{$target}}, $portal;
+ }
+ });
+ };
+
+ # In case of multipath we can stop after receiving targets from any available portal
+ last if scalar(keys %$res) > 0;
+ }
return $res;
}
sub iscsi_login {
- my ($target, $portal_in) = @_;
+ my ($target, $portals) = @_;
check_iscsi_support();
- eval { iscsi_discovery($portal_in); };
+ eval { iscsi_discovery($portals); };
warn $@ if $@;
run_command([$ISCSIADM, '--mode', 'node', '--targetname', $target, '--login']);
}
sub iscsi_logout {
- my ($target, $portal) = @_;
+ my ($target) = @_;
check_iscsi_support();
@@ -133,7 +172,7 @@ sub iscsi_session_rescan {
}
foreach my $session (@$session_list) {
- my $cmd = [$ISCSIADM, '--mode', 'session', '--sid', $session, '--rescan'];
+ my $cmd = [$ISCSIADM, '--mode', 'session', '--sid', $session->{session_id}, '--rescan'];
eval { run_command($cmd, outfunc => sub {}); };
warn $@ if $@;
}
@@ -379,14 +418,28 @@ sub activate_storage {
return if !check_iscsi_support(1);
- my $session = iscsi_session($cache, $scfg->{target});
+ my $sessions = iscsi_session($cache, $scfg->{target});
+ my $portals = iscsi_portals($scfg->{target}, $scfg->{portal});
+ my $do_login = !defined($sessions);
- if (!defined ($session)) {
- eval { iscsi_login($scfg->{target}, $scfg->{portal}); };
+ if (!$do_login) {
+ # We should check that sessions for all portals are available
+ my $session_portals = [ map { $_->{portal} } (@$sessions) ];
+
+ for my $portal (@$portals) {
+ if (!grep(/^\Q$portal\E$/, @$session_portals)) {
+ $do_login = 1;
+ last;
+ }
+ }
+ }
+
+ if ($do_login) {
+ eval { iscsi_login($scfg->{target}, $portals); };
warn $@ if $@;
} else {
# make sure we get all devices
- iscsi_session_rescan($session);
+ iscsi_session_rescan($sessions);
}
}
@@ -396,15 +449,21 @@ sub deactivate_storage {
return if !check_iscsi_support(1);
if (defined(iscsi_session($cache, $scfg->{target}))) {
- iscsi_logout($scfg->{target}, $scfg->{portal});
+ iscsi_logout($scfg->{target});
}
}
sub check_connection {
my ($class, $storeid, $scfg) = @_;
- my $portal = $scfg->{portal};
- return iscsi_test_portal($portal);
+ my $portals = iscsi_portals($scfg->{target}, $scfg->{portal});
+
+ for my $portal (@$portals) {
+ my $result = iscsi_test_portal($portal);
+ return $result if $result;
+ }
+
+ return 0;
}
sub volume_resize {
--
2.41.0
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