Hello, i?ve already read many posts about checksum error on zpools but i like to have some more informations, please. We use 2 sun servers (amd x64, SunOS, 5.10 Generic_118855-36, hopefully all patches) with two hardware raids (raid 10) connected through fibre channel. Disk space is about 3 TB split into 4 pool including several (about 10 - 15) zfs each. After 22 days uptime i got a first checksum error entry after zpool scrub (running once a week on every pool). As i got no errors on my raid systems, no error entry on my servers (message files) i like to know what this error is based on. The zpool status information told me that at least one devices had a repairable error that had been tried to recover. And now i should check for hardware errors on those devices. NAME STATE READ WRITE CKSUM system ONLINE 0 0 0 mirror ONLINE 0 0 0 c3t113d3 ONLINE 0 0 0 c4t210000D023209353d3 ONLINE 0 0 1 All the physical and logical disks are o.k. so i can?t imagine where the problem had been. Many thanks for all informations. This message posted from opensolaris.org