On Mon, Sep 29, 2014 at 6:14 PM, Andrew M. Hettinger < [email protected]> wrote:
> Bob Friesenhahn <[email protected]> wrote on 09/29/2014 > 05:57:26 PM: > > > How would ZFS know if the data stored is "incorrect" from the user's > > perspective? > > > > Presumably because the checksum is wrong. > Exactly, if the data is returned incorrect from the SSD ZFS will detect it via checksum. It will then rebuild from the raidz1 parity, if that fails it will return a data read error. In relation to the original topic, with 163 days uptime, the scratch pool has had zero checksum errors. It gets completely rewritten about twice a week on average. At its peak usage it was rewritten daily for about 45 days. root@hcp-iops1:~# uptime 07:44am up 163 days 20:57, 1 user, load average: 0.13, 0.15, 0.16 root@hcp-iops1:~# zpool status scratch pool: scratch state: ONLINE scan: scrub repaired 0 in 7h59m with 0 errors on Sat Sep 6 00:59:21 2014 config: NAME STATE READ WRITE CKSUM scratch ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c1t500253855035D1B1d0s0 ONLINE 0 0 0 c1t500253855035D12Fd0s0 ONLINE 0 0 0 c1t500253855035D114d0s0 ONLINE 0 0 0 c1t500253855035D10Ed0s0 ONLINE 0 0 0 c1t500253855035D109d0s0 ONLINE 0 0 0 raidz1-1 ONLINE 0 0 0 c1t500253855035D1C1d0s0 ONLINE 0 0 0 c1t500253855035D1C0d0s0 ONLINE 0 0 0 c1t500253855035D1BFd0s0 ONLINE 0 0 0 c1t500253855035D1BEd0s0 ONLINE 0 0 0 c1t500253855035D1B5d0s0 ONLINE 0 0 0 raidz1-2 ONLINE 0 0 0 c1t500253855035D1E3d0s0 ONLINE 0 0 0 c1t500253855035D1E1d0s0 ONLINE 0 0 0 c1t500253855035D1C8d0s0 ONLINE 0 0 0 c1t500253855035D1C6d0s0 ONLINE 0 0 0 c1t500253855035D1C3d0s0 ONLINE 0 0 0 raidz1-3 ONLINE 0 0 0 c1t500253855035D8C0d0s0 ONLINE 0 0 0 c1t500253855035D8BDd0s0 ONLINE 0 0 0 c1t500253855035D1F6d0s0 ONLINE 0 0 0 c1t500253855035D1E6d0s0 ONLINE 0 0 0 c1t500253855035D1E5d0s0 ONLINE 0 0 0 raidz1-4 ONLINE 0 0 0 c1t500253855035D8C7d0s0 ONLINE 0 0 0 c1t500253855035D8C6d0s0 ONLINE 0 0 0 c1t500253855035D8C3d0s0 ONLINE 0 0 0 c1t500253855035D8C2d0s0 ONLINE 0 0 0 c1t500253855035D8C1d0s0 ONLINE 0 0 0 raidz1-5 ONLINE 0 0 0 c1t500253855035E2F6d0s0 ONLINE 0 0 0 c1t500253855035E2F5d0s0 ONLINE 0 0 0 c1t500253855035E2ECd0s0 ONLINE 0 0 0 c1t500253855035E2EBd0s0 ONLINE 0 0 0 c1t500253855035E2D7d0s0 ONLINE 0 0 0 raidz1-6 ONLINE 0 0 0 c1t500253855035F484d0s0 ONLINE 0 0 0 c1t500253855035F483d0s0 ONLINE 0 0 0 c1t500253855035F480d0s0 ONLINE 0 0 0 c1t500253855035F472d0s0 ONLINE 0 0 0 c1t500253855035F46Fd0s0 ONLINE 0 0 0 raidz1-7 ONLINE 0 0 0 c1t5002538550363742d0s0 ONLINE 0 0 0 c1t500253855036373Ed0s0 ONLINE 0 0 0 c1t50025385503633BDd0s0 ONLINE 0 0 0 c1t5002538550363164d0s0 ONLINE 0 0 0 c1t500253855035F489d0s0 ONLINE 0 0 0 raidz1-8 ONLINE 0 0 0 c1t500253855036378Ad0s0 ONLINE 0 0 0 c1t5002538550363789d0s0 ONLINE 0 0 0 c1t5002538550363786d0s0 ONLINE 0 0 0 c1t500253855036374Cd0s0 ONLINE 0 0 0 c1t500253855036374Bd0s0 ONLINE 0 0 0 raidz1-9 ONLINE 0 0 0 c1t500253855035D1F4d0s0 ONLINE 0 0 0 c1t500253855035D1ECd0s0 ONLINE 0 0 0 c1t500253855035D1E2d0s0 ONLINE 0 0 0 c1t500253855035D1DAd0s0 ONLINE 0 0 0 c1t500253855035D1B2d0s0 ONLINE 0 0 0 raidz1-10 ONLINE 0 0 0 c1t500253855035D12Dd0s0 ONLINE 0 0 0 c1t500253855035D8C8d0s0 ONLINE 0 0 0 c1t500253855035D8C5d0s0 ONLINE 0 0 0 c1t500253855035D8C4d0s0 ONLINE 0 0 0 c1t500253855035D1F8d0s0 ONLINE 0 0 0 raidz1-11 ONLINE 0 0 0 c1t5002538550363793d0s0 ONLINE 0 0 0 c1t500253855035E2DBd0s0 ONLINE 0 0 0 c1t500253855035E2DAd0s0 ONLINE 0 0 0 c1t500253855035E2D9d0s0 ONLINE 0 0 0 c1t500253855035D12Ed0s0 ONLINE 0 0 0 spares c1t5002538550363794d0s0 AVAIL c1t5002538550363797d0s0 AVAIL c1t500253855035E2D8d0s0 AVAIL errors: No known data errors
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