Merge pull request #437 from phreaker0/preserve-recordsize

preserve recordsize

README.md

@@ -314,6 +314,10 @@ As of 1.4.18, syncoid also automatically supports and enables resume of interrup
 
 	This argument tells syncoid to create a zfs bookmark for the newest snapshot after it got replicated successfully. The bookmark name will be equal to the snapshot name. Only works in combination with the --no-sync-snap option. This can be very useful for irregular replication where the last matching snapshot on the source was already deleted but the bookmark remains so a replication is still possible.
 
++ --preserve-recordsize
+
+	This argument tells syncoid to set the recordsize on the target before writing any data to it matching the one set on the replication src. This only applies to initial sends.
+
 + --no-clone-rollback
 
 	Do not rollback clones on target

syncoid

@@ -25,7 +25,7 @@ GetOptions(\%args, "no-command-checks", "monitor-version", "compress=s", "dumpsn
                    "source-bwlimit=s", "target-bwlimit=s", "sshkey=s", "sshport=i", "sshcipher|c=s", "sshoption|o=s@",
                    "debug", "quiet", "no-stream", "no-sync-snap", "no-resume", "exclude=s@", "skip-parent", "identifier=s",
                    "no-clone-handling", "no-privilege-elevation", "force-delete", "no-clone-rollback", "no-rollback",
-                   "create-bookmark", "pv-options=s" => \$pvoptions, "keep-sync-snap",
+                   "create-bookmark", "pv-options=s" => \$pvoptions, "keep-sync-snap", "preserve-recordsize",
                    "mbuffer-size=s" => \$mbuffer_size) or pod2usage(2);
 
 my %compressargs = %{compressargset($args{'compress'} || 'default')}; # Can't be done with GetOptions arg, as default still needs to be set
@@ -438,6 +438,14 @@ sub syncdataset {
 		}
 		my $oldestsnapescaped = escapeshellparam($oldestsnap);
 
+		if (defined $args{'preserve-recordsize'}) {
+			my $type = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'type');
+			if ($type eq "filesystem") {
+				my $recordsize = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'recordsize');
+				$recvoptions .= "-o recordsize=$recordsize"
+			}
+		}
+
 		my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions $sourcefsescaped\@$oldestsnapescaped";
 		my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped";
 
@@ -1964,6 +1972,7 @@ Options:
   --no-sync-snap        Does not create new snapshot, only transfers existing
   --keep-sync-snap      Don't destroy created sync snapshots
   --create-bookmark     Creates a zfs bookmark for the newest snapshot on the source after replication succeeds (only works with --no-sync-snap)
+  --preserve-recordsize Preserves the recordsize on initial sends to the target
   --no-clone-rollback   Does not rollback clones on target
   --no-rollback         Does not rollback clones or snapshots on target (it probably requires a readonly target)
   --exclude=REGEX       Exclude specific datasets which match the given regular expression. Can be specified multiple times

tests/syncoid/7_preserve_recordsize/run.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# test preserving the recordsize from the src filesystem to the target one
+
+set -x
+set -e
+
+. ../../common/lib.sh
+
+POOL_IMAGE="/tmp/syncoid-test-7.zpool"
+MOUNT_TARGET="/tmp/syncoid-test-7.mount"
+POOL_SIZE="1000M"
+POOL_NAME="syncoid-test-7"
+
+truncate -s "${POOL_SIZE}" "${POOL_IMAGE}"
+
+zpool create -m none -f "${POOL_NAME}" "${POOL_IMAGE}"
+
+function cleanUp {
+  zpool export "${POOL_NAME}"
+}
+
+# export pool in any case
+trap cleanUp EXIT
+
+zfs create "${POOL_NAME}"/src
+zfs create -V 100M -o volblocksize=4k "${POOL_NAME}"/src/zvol4
+zfs create -V 100M -o volblocksize=16k "${POOL_NAME}"/src/zvol16
+zfs create -V 100M -o volblocksize=64k "${POOL_NAME}"/src/zvol64
+zfs create -o recordsize=16k "${POOL_NAME}"/src/16
+zfs create -o recordsize=32k "${POOL_NAME}"/src/32
+zfs create -o recordsize=128k "${POOL_NAME}"/src/128
+../../../syncoid --preserve-recordsize --recursive --debug --compress=none "${POOL_NAME}"/src "${POOL_NAME}"/dst
+
+zfs get recordsize -t filesystem -r "${POOL_NAME}"/dst
+zfs get volblocksize -t volume -r "${POOL_NAME}"/dst
+
+if [ "$(zfs get recordsize -H -o value -t filesystem "${POOL_NAME}"/dst/16)" != "16K" ]; then
+	exit 1
+fi
+
+if [ "$(zfs get recordsize -H -o value -t filesystem "${POOL_NAME}"/dst/32)" != "32K" ]; then
+	exit 1
+fi
+
+if [ "$(zfs get recordsize -H -o value -t filesystem "${POOL_NAME}"/dst/128)" != "128K" ]; then
+	exit 1
+fi