ReadyNAS Pro Pioneer Edition running 4.2.19 Connected over Gigabit Ethernet (Jumbo Frames) to Mac Pro running 10.6.8 iSCSI via GlobalSAN Initiator v4.1 iSCSI disk formatted HFS+ Journaled
Just activated iSCSI on my RN Pro Pioneer via the iSCSI add-in. One LUN. Connection is fine, but the write performance is very poor and I can't debug the cause. I'm getting at most ~4MB/sec, but throughput is very sporadic, bouncing between 3-4MB/sec and ~300KB/sec. I have the same ReadyNAS simultaneously mounted via AFP, and I get write speeds upwards of 70/MB second, with very little variation in write (or read) speed.
Haven't found many users via Google Search who have documented their iSCSI configuations or issues, and the ones who have often create a dedicated connection between RN and server with no other load generating services. My RN is used primarily for backups and lower availability disk storage, but it does serve a web site and WebDAV that get little Internet traffic.
What do others get in terms of iSCSI write performance to Mac, and are there any tips or tricks you learned along the way?
Going back to the older version solved the performance issues I was seeing. Thanks for the tip. I don't mind paying for the iSCSI initiator if it works well, which 4.1 did not for me.
