hi guys,
thanks for all the infos here, especially madbug
thought id chime in here with my experiences, ive got a fairly big config, namely 23 drives.
my configuration is intel rs2wc080. im running 2 volumes. 10 x 2tb in raid6. and 9 x 1tb in raid6.
then there are 4 extra drives added to this system (4 x 1tb.) and with the mdadm --grow command (im not using unraid but linux mdadm through ubuntu)
i kept getting drive disconnects, it was random. another user here reported somewhere on this thread page 5-15...(i forget) that updating from p10 to p11 solved the problem.
my initial flash to sas2008 lsi 9211-8i was firmware v7. so i got all excited flashed to 10. no joy. flashed to 11. no joy.
eventually flashed to p17 from lsi site. no joy
its when i update my 36port intel expander board res2cv36 (based on lsi sas2x36) firmware from v10 to v13 that my problem got solved.
the changelog also mentions timeouts with sata drives etc
now the intel res2cv24 (24port expander) will be the same.
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Fixes/Updates
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v13
- SMP fix (Populate ATTACHED DEVICE NAME instead of using SAS Address.
- SMP fix send BREAK if SMP frame lenght exceeds maximum lenght allowed by the SAS 2 specification.
v12
- Significantly reduce the likelihood and frequency of link resets, this was causing IO timeouts with SATA drives.
- Zoning fixes
oh and the frequency of the errors and drive disconnects is immediately noticeable under LOAD.