@host02 # drbdadm invalidate r0 # host01からデータをコピーする。 # drbdadm down r0 # drbdadm up r0 @host01 # drbdadm down r0 # drbdadm up r0こうすることで、ようやくsyncが再度かかり冗長な状態に復旧することができた。
CentOS release 5 (Final) Linux host01 2.6.18-53.1.4.el5 #1 SMP Fri Nov 30 00:45:16 EST 2007 i686 i686 i386 GNU/Linux0.7までのPri/Stbでは、heartbeatで、
* drbd領域のprimary化 * マウント * nfsサービスの起動 * ipの付け替えをおこなう必要があったが、Pri/Pri構成なら
* ipの付け替えだけで済むのではとのもくろみ。cman+drbd+clvmd+gfs2の設定は終了していて、Pri/Priでの動作は確認済み。 続いてこの領域(/data1)をNFSでエクスポートする。
@host01 service rpcidmapd stop umount /var/lib/nfs/rpc_pipefs mv /var/lib/nfs /data1/ ln -s /data1/nfs /var/lib/nfs mount -t rpc_pipefs sunrpc /var/lib/nfs/rpc_pipefs service rpcidmapd start service nfs start service keepalived start # VRRPで仮想IPを使う @host02 service rpcidmapd stop umount /var/lib/nfs/rpc_pipefs rm -rf /var/lib/nfs ln -s /data1/nfs /var/lib/nfs mount -t rpc_pipefs sunrpc /var/lib/nfs/rpc_pipefs service rpcidmapd start service nfs start service keepalived startNFSクライアント(host03)からの接続は、仮想IP(vhost00)に対しておこなう。 切り替わりの発生は、keepalivedをstop/startすることでおこなう。 実際切り替えてみると、host03からの接続は固まってしまう。つまり冗長化は失敗（残念！）。切り替わり後のサービスの起動などの処理は行わないとだめなのかもしれない。もう少し試行しみる・・
/etc/idmapd.confなるものがることを知り、rpcpipe_fsを/var/lib/nfsではなく、/tmp/rpcpip_fsとしてみた。この場合切り戻し時にフリーズしてしまった。
間違い。切り戻しどころか、切り替え時にクライアント側がフリーズ
rpcidmapdはnfs v4で使われるサービス。今回v3でクライアントから接続できればいいので、このサービスは不要。ただし、centos5のinit.d/nfsスクリプトは、rpcidmapdがインストールされていれば使う仕様となっている。過去heartbeatのharesourcesファイルで、nfsを起動・停止する際にrpcidmapdでエラーがでて処理が止まってはまったことがある。
nfs4については、このサイトが詳しい。<br>http://www.asahi-net.or.jp/~aa4t-nngk/nfsv4.html
nfsを起動するようにして、切り替えはうまくいくようになった。<br>切り替え後、読み込みは５秒程度でできるようになり、書き込みできるようになるには１分３０秒程度かかる。nfs3(2?)の方が切り替わり後、書き込めるようになるまでは速い感じ
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