Ok, now I do see sync writes to the LUN over iscsi from MS initiator - when I disable write-back cache. The strange thing is sync on nfs - it's always there.
Disabling write-back on iscsi decreases speed by 50 times to 1.5MB/s on a full format operation. My concern now is applications data (MS Exchange in particular). Am I understand correctly that write-back cache on lun can lead to data corruption if a storage server fails and if it works without non-volatile memory? An application gets confirmation that data has been written, but it's only in zfs tpg, right? Data remains consistent on disk, but from application point of view data order will be lost. What are rhe solutions? Except SSD which also can lead to pool damage (because of the bug - slog can't be removed). NVRAM? -- Roman -- This message posted from opensolaris.org _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
