support resumable zfs send/receive
This commit is contained in:
Christoph Klaffl
parent
85cc99c9e6
commit
d5f4b5abba
127
syncoid
127
syncoid
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@ -19,7 +19,7 @@ use Sys::Hostname;
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my %args = ('sshkey' => '', 'sshport' => '', 'sshcipher' => '', 'sshoption' => [], 'target-bwlimit' => '', 'source-bwlimit' => '');
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GetOptions(\%args, "no-command-checks", "monitor-version", "compress=s", "dumpsnaps", "recursive|r",
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"source-bwlimit=s", "target-bwlimit=s", "sshkey=s", "sshport=i", "sshcipher|c=s", "sshoption|o=s@",
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"debug", "quiet", "no-stream", "no-sync-snap") or pod2usage(2);
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"debug", "quiet", "no-stream", "no-sync-snap", "resume") or pod2usage(2);
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my %compressargs = %{compressargset($args{'compress'} || 'default')}; # Can't be done with GetOptions arg, as default still needs to be set
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@ -161,35 +161,55 @@ sub syncdataset {
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# does the target filesystem exist yet?
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my $targetexists = targetexists($targethost,$targetfs,$targetisroot);
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# build hashes of the snaps on the source and target filesystems.
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my $receiveextraargs = "";
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my $receivetoken;
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if (defined $args{'resume'}) {
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# save state of interrupted receive stream
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$receiveextraargs = "-s";
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%snaps = getsnaps('source',$sourcehost,$sourcefs,$sourceisroot);
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if ($targetexists) {
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# check remote dataset for receive resume token (interrupted receive)
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$receivetoken = getreceivetoken($targethost,$targetfs,$targetisroot);
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if ($targetexists) {
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my %targetsnaps = getsnaps('target',$targethost,$targetfs,$targetisroot);
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my %sourcesnaps = %snaps;
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%snaps = (%sourcesnaps, %targetsnaps);
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}
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if (defined $args{'dumpsnaps'}) {
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print "merged snapshot list of $targetfs: \n";
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dumphash(\%snaps);
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print "\n\n\n";
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}
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# create a new syncoid snapshot on the source filesystem.
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my $newsyncsnap;
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if (!defined $args{'no-sync-snap'}) {
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$newsyncsnap = newsyncsnap($sourcehost,$sourcefs,$sourceisroot);
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} else {
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# we don't want sync snapshots created, so use the newest snapshot we can find.
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$newsyncsnap = getnewestsnapshot($sourcehost,$sourcefs,$sourceisroot);
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if ($newsyncsnap eq 0) {
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warn "CRITICAL: no snapshots exist on source $sourcefs, and you asked for --no-sync-snap.\n";
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return 0;
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if ($debug && defined($receivetoken)) {
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print "DEBUG: got receive resume token: $receivetoken: \n";
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}
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}
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}
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my $newsyncsnap;
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# skip snapshot checking/creation in case of resumed receive
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if (!defined($receivetoken)) {
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# build hashes of the snaps on the source and target filesystems.
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%snaps = getsnaps('source',$sourcehost,$sourcefs,$sourceisroot);
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if ($targetexists) {
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my %targetsnaps = getsnaps('target',$targethost,$targetfs,$targetisroot);
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my %sourcesnaps = %snaps;
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%snaps = (%sourcesnaps, %targetsnaps);
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}
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if (defined $args{'dumpsnaps'}) {
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print "merged snapshot list of $targetfs: \n";
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dumphash(\%snaps);
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print "\n\n\n";
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}
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if (!defined $args{'no-sync-snap'}) {
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# create a new syncoid snapshot on the source filesystem.
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$newsyncsnap = newsyncsnap($sourcehost,$sourcefs,$sourceisroot);
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} else {
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# we don't want sync snapshots created, so use the newest snapshot we can find.
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$newsyncsnap = getnewestsnapshot($sourcehost,$sourcefs,$sourceisroot);
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if ($newsyncsnap eq 0) {
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warn "CRITICAL: no snapshots exist on source $sourcefs, and you asked for --no-sync-snap.\n";
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return 0;
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}
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}
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}
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# there is currently (2014-09-01) a bug in ZFS on Linux
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# that causes readonly to always show on if it's EVER
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# been turned on... even when it's off... unless and
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@ -222,7 +242,7 @@ sub syncdataset {
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my $oldestsnapescaped = escapeshellparam($oldestsnap);
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my $sendcmd = "$sourcesudocmd $zfscmd send $sourcefsescaped\@$oldestsnapescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive -F $targetfsescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"$sourcefs\@$oldestsnap",0,$sourceisroot);
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my $disp_pvsize = readablebytes($pvsize);
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@ -286,6 +306,27 @@ sub syncdataset {
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# setzfsvalue($targethost,$targetfs,$targetisroot,'readonly',$originaltargetreadonly);
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}
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} else {
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# resume interrupted receive if there is a valid resume $token
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# and because this will ony resume the receive to the next
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# snapshot, do a normal sync after that
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if (defined($receivetoken)) {
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my $sendcmd = "$sourcesudocmd $zfscmd send -t $receivetoken";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"","",$sourceisroot,$receivetoken);
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my $disp_pvsize = readablebytes($pvsize);
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if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
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my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
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if (!$quiet) { print "Resuming interrupted zfs send/receive from $sourcefs to $targetfs (~ $disp_pvsize remaining):\n"; }
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if ($debug) { print "DEBUG: $synccmd\n"; }
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system("$synccmd") == 0
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or die "CRITICAL ERROR: $synccmd failed: $?";
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# a resumed transfer will only be done to the next snapshot,
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# so do an normal sync cycle
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return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs);
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}
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# find most recent matching snapshot and do an -I
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# to the new snapshot
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@ -326,7 +367,7 @@ sub syncdataset {
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}
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my $sendcmd = "$sourcesudocmd $zfscmd send $args{'streamarg'} $sourcefsescaped\@$matchingsnapescaped $sourcefsescaped\@$newsyncsnap";
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my $recvcmd = "$targetsudocmd $zfscmd receive -F $targetfsescaped";
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my $recvcmd = "$targetsudocmd $zfscmd receive $receiveextraargs -F $targetfsescaped";
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my $pvsize = getsendsize($sourcehost,"$sourcefs\@$matchingsnap","$sourcefs\@$newsyncsnap",$sourceisroot);
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my $disp_pvsize = readablebytes($pvsize);
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if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
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@ -931,7 +972,7 @@ sub getsnaps() {
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sub getsendsize {
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my ($sourcehost,$snap1,$snap2,$isroot) = @_;
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my ($sourcehost,$snap1,$snap2,$isroot,$receivetoken) = @_;
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my $snap1escaped = escapeshellparam($snap1);
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my $snap2escaped = escapeshellparam($snap2);
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@ -957,6 +998,12 @@ sub getsendsize {
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$snaps = "$snap1escaped";
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}
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# in case of a resumed receive, get the remaining
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# size based on the resume token
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if (defined($receivetoken)) {
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$snaps = "-t $receivetoken";
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}
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my $getsendsizecmd = "$sourcessh $mysudocmd $zfscmd send -nP $snaps";
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if ($debug) { print "DEBUG: getting estimated transfer size from source $sourcehost using \"$getsendsizecmd 2>&1 |\"...\n"; }
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@ -969,7 +1016,13 @@ sub getsendsize {
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# size of proposed xfer in bytes, but we need to remove
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# human-readable crap from it
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my $sendsize = pop(@rawsize);
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$sendsize =~ s/^size\s*//;
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# the output format is different in case of
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# a resumed receive
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if (defined($receivetoken)) {
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$sendsize =~ s/.*\s([0-9]+)$/$1/;
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} else {
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$sendsize =~ s/^size\s*//;
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}
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chomp $sendsize;
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# to avoid confusion with a zero size pv, give sendsize
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@ -1006,6 +1059,21 @@ sub escapeshellparam {
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return "'$par'";
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}
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sub getreceivetoken() {
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my ($rhost,$fs,$isroot) = @_;
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my $token = getzfsvalue($rhost,$fs,$isroot,"receive_resume_token");
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if ($token ne '-' && $token ne '') {
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return $token;
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}
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if ($debug) {
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print "DEBUG: no receive token found \n";
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}
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return
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}
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__END__
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=head1 NAME
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@ -1043,3 +1111,4 @@ Options:
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--quiet Suppresses non-error output
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--dumpsnaps Dumps a list of snapshots during the run
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--no-command-checks Do not check command existence before attempting transfer. Not recommended
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--resume Save the state of unfinished receive streams and resume interrupted ones if available
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