Ian Collins wrote:
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 second and third ones are pretty much full, with the others having
well over 10 times more free space, so I wouldn't expect many writes to
the full ones.
Have the others ever been in a degraded state? That might explain why
the fill level has become unbalanced.
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
------------ ----- ----- ----- ----- ----- -----
--
Andrew
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