Michael Schuh wrote:
i have searched informations about geom-gate and RAID1 or Raid10 over TCP/IP. But nothing relevant found, so that i write the questions here.
Actually, there has been some discussion about this, but you probably won't like the result...
Has anyone any experiences with geom-gate and doing RAID1 or RAID10 over TCP/IP? And has anyone a good solution in Production use?
Theoretically, yes - it can be done this way. You could use any GEOM-aware RAID solution, and throw ggate in the mix.
When I tried it (back in early 5-stable days) I could create the setup just fine, but could not stabilise it - gmirror kept loosing the ggate component(s), possibly(?) due to timeouts from network latency. IIRC, just around the time 6-stable was branched there was a similar report from somebody else. BUT, ggate has had several changes since then that should address performace, so maybe it's time to try again.
There's another problem: if you do get the over-the-network mirroring to work, you won't be able to share data this way: the one-writer-multiple-readers scenario won't work because the filesystem doesn't support it on the reader side (when the data gets modified by the writer, the reader doesn't know about it). Readonly-for-all scenario will work.
(see also this: http://docs.freebsd.org/cgi/mid.cgi?438B05D6.3000108 - I'll maybe find the time soon)
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