I was running zpool iostat on a pool comprising a stripe of raidz2 vdevs
that appears to be writing slowly and I notice a considerable imbalance
of both free space and write operations. The pool is currently feeding
a tape backup while receiving a large filesystem.
Is this imbalance normal? I would expect a more even distribution as
the poll configuration hasn't been changed since creation.
The system is running Solaris 10 update 7.
capacity operations bandwidth
pool used avail read write read write
------------ ----- ----- ----- ----- ----- -----
tank 15.9T 2.19T 87 119 2.34M 1.88M
raidz2 2.90T 740G 24 27 762K 95.5K
c0t1d0 - - 14 13 273K 18.6K
c1t1d0 - - 15 13 263K 18.3K
c4t2d0 - - 17 14 288K 18.2K
spare - - 17 20 104K 17.2K
c5t2d0 - - 16 13 277K 17.6K
c7t5d0 - - 0 14 0 17.6K
c6t3d0 - - 15 12 242K 18.7K
c7t3d0 - - 15 12 242K 17.6K
c6t4d0 - - 16 12 272K 18.1K
c1t0d0 - - 15 13 275K 16.8K
raidz2 3.59T 37.8G 20 0 546K 0
c0t2d0 - - 11 0 184K 361
c1t3d0 - - 10 0 182K 361
c4t5d0 - - 14 0 237K 361
c5t5d0 - - 13 0 220K 361
c6t6d0 - - 12 0 155K 361
c7t6d0 - - 11 0 149K 361
c7t4d0 - - 14 0 219K 361
c4t0d0 - - 14 0 213K 361
raidz2 3.58T 44.1G 27 0 1.01M 0
c0t5d0 - - 16 0 290K 361
c1t6d0 - - 15 0 301K 361
c4t7d0 - - 20 0 375K 361
c5t1d0 - - 19 0 374K 361
c6t7d0 - - 17 0 285K 361
c7t7d0 - - 15 0 253K 361
c0t0d0 - - 18 0 328K 361
c6t0d0 - - 18 0 348K 361
raidz2 3.05T 587G 7 47 24.9K 1.07M
c0t4d0 - - 3 21 254K 187K
c1t2d0 - - 3 22 254K 187K
c4t3d0 - - 5 22 350K 187K
c5t3d0 - - 5 21 350K 186K
c6t2d0 - - 4 22 265K 187K
c7t1d0 - - 4 21 271K 187K
c6t1d0 - - 5 22 345K 186K
c4t1d0 - - 5 24 333K 184K
raidz2 2.81T 835G 8 45 30.9K 733K
c0t3d0 - - 5 16 339K 126K
c1t5d0 - - 5 16 333K 126K
c4t6d0 - - 6 16 441K 127K
c5t6d0 - - 6 17 435K 126K
c6t5d0 - - 4 18 294K 126K
c7t2d0 - - 4 18 282K 124K
c0t6d0 - - 7 19 446K 124K
c5t7d0 - - 7 21 452K 122K
------------ ----- ----- ----- ----- ----- -----
--
Ian.
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