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Pavel
Asked: 2013-07-20 05:00:19 +0800 CST

ZFS: Why does resilvering go over all disks in a pool rather than only those in the raidz1 vdev?

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I'm wondering why Solaris is reporting 

action: Wait for the resilver to complete.
 scan: resilver in progress since Sun Jul 14 02:42:44 2013
    24.9T scanned out of 39.2T at 54.9M/s, 75h46m to go
    24.9T scanned out of 39.2T at 54.9M/s, 75h46m to go
    908G resilvered, 63.56% done

39.2T is the size of the complete pool, which is built from 4 raidz1 vdevs:

config:

        NAME                                       STATE     READ WRITE CKSUM
        volume                                     ONLINE       0     0     0
          raidz1-0                                 ONLINE       0     0     0
...
          raidz1-1                                 ONLINE       0     0     0
...
          raidz1-2                                 ONLINE       0     0     0
...
          raidz1-3                                 ONLINE       0     0     0
...

and every raidz1 has 7 disks x 2TB.

So, IIUC, the resilvering would have to go over <= 6x2TB to reconstruct the data of a single failed disk. How comes ZFS is scanning over the whole pool? I thought the redundant data needed for resilvering is not stored across multiple raidzs?

Thank you for explanation!

solaris

0 Answers