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istgt[3135] end of media & lu_disk_lbread() failed errors

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I have 2 FreeNas setups nearly identical
HP Proliant G5 with 8GB of RAM.

Difference is in drives

NAS1 has 4 x 460GB Crucial M550 Drives in a ZFS RaidZ1 config
NAS2 has 4 x 750GB Hybrid Seagate SATA drives, RAIDz2 config 1 128GB Samsung SSD as log, 1 128GB SSD Samsung as cache

both have identical config

NAS1 works perfectly - 3 months no crash
NAS2 crashes twice weekly "randomly" or after a heavy transfer

What is the issue and how it can be resolved?

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