Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Most likely will require you to rebuild the volumes with lvm (clustered version) in the middle (rawdev>lvm>drbd>ocfs) then take a lvm snapshot, back that up. The snapshot should be static and not updated, point in time. However keep in mind, it you read excessively from the shared device, you will slow everything down. A better approach is to have each client backup their own little world, there can schedule such a way not to saturate the I/O capability of the storage system. Just a suggestion James ----- Original Message ----- From: Vasily S. Kostroma [mailto:admin at v-sf.info] Sent: Friday, January 03, 2014 07:04 PM To: drbd-user at lists.linbit.com <drbd-user at lists.linbit.com> Subject: [DRBD-user] High IOwait with rsync on DRBD-OCFS2-NFS node Happy holidays, friends. It's my first message in this list. I have two 100% same servers with two logical drives - one for system and second one for DRBD primary-primary configuration. The servers connected via dedicated Gb NIC's via crossover cable. Operational system is Debian 7, file system for DRBD is OCFS2. Additionally I using NFS server to share a files from DRBD drive to other servers. The configuration is very simple. Just one resource with internal metadata. Nothing special. But I have a problem and, unfortunately, I have no idea how to fix it. I using Node1 as primary and Node2 as secondary. I mean clients (web-servers) are connecting to Node1 via NFS, and backup's running on Node2. Example. I starting rsync on Node2 to sync a local folder with folder on the same server, but DRBD+OCFS2. It's working fine, but in backup time the NFS server on Node1 stop working till backup on Node2 is in progress. A NFS processes (threads) is on "D" state in top. After backups completed the NFS start working perfectly. Just for additional attention: I running rsync on Node2, but NFS stop working on Node1. I will appreciate any idea what is wrong.. All settings is almost default, but problem is there :( Sorry for my English. And thank you in advance. Happy holidays!