I just deployed zfs on my newer cyrus servers. These servers get less than 2000 mails per hour and around 400 concurrent pop/imap connections I have seen that even if there is no incoming pop or imap connection still there is large amount of READ happenning on the zfs partitions. Is this normal behaviour for an imap server. Iostat shows sometimes upto 2000 TPS The reads are infact more than 10x of what writes are. I am afraid I will be trashing the harddisk. Do I need to tune ZFS specially for cyrus ? This is the typical zpool iostat output zpool iostat 1 pool alloc free read write read write ---------- ----- ----- ----- ----- ----- ----- imap 145G 655G 418 58 18.0M 1.78M imap 146G 654G 258 118 8.28M 960K imap 145G 655G 447 146 19.4M 4.37M imap 145G 655G 413 32 19.4M 1.46M imap 145G 655G 339 4 14.8M 20.0K imap 145G 655G 341 40 15.7M 755K imap 145G 655G 305 10 15.0M 55.9K imap 145G 655G 328 12 14.8M 136K ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
