I'm seeing some strange behavior on my new hardware and would like to
figure out some way to diagnose what's going on. It's not a serious
problem yet, but I'd like to know if this will be indicative of things
I'll see later.
I have a 7-disk striped zpool composed of whatever I had lying around
(i.e., I don't really trust these disks). I'm writing large
sequential blocks to it with dd. Watching in 'zpool iostat -v scratch
10', I see things like this (summarized; full output later):
scratch 391G 1.90T 0 2.44K 12.8K 308M
scratch 393G 1.90T 0 1.23K 57.5K 156M
scratch 393G 1.90T 0 0 0 0 (does this a few times)
scratch 396G 1.89T 0 1.76K 6.39K 220M
How can I diagnose which disk (or other piece of hardware) is causing
these slowdowns? This system isn't in production, so I can do
arbitrary things to it.
The (almost) full output of zpool iostat follows:
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
scratch 391G 1.90T 0 2.44K 12.8K 308M
c4t9d0 67.2G 629G 0 432 0 53.5M
c4t10d0 54.0G 94.0G 0 339 6.39K 42.2M
c4t11d0 54.3G 244G 0 332 0 41.5M
c4t12d0 54.0G 244G 0 347 0 42.8M
c4t13d0 54.0G 244G 0 350 0 43.0M
c4t14d0 54.0G 244G 0 349 0 42.6M
c4t15d0 54.0G 244G 0 345 6.39K 42.3M
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
scratch 393G 1.90T 0 1.23K 57.5K 156M
c4t9d0 67.4G 629G 0 190 6.39K 23.5M
c4t10d0 54.2G 93.8G 0 172 0 21.5M
c4t11d0 54.5G 243G 0 194 0 24.3M
c4t12d0 54.2G 244G 0 170 19.2K 21.3M
c4t13d0 54.2G 244G 0 175 12.8K 21.6M
c4t14d0 54.2G 244G 0 178 12.8K 21.7M
c4t15d0 54.2G 244G 0 179 6.39K 21.8M
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
scratch 393G 1.90T 0 0 0 0
(snipped here; all disks are zeroes all the way across)
scratch 393G 1.90T 0 0 0 0
scratch 393G 1.90T 0 0 0 0
scratch 393G 1.90T 0 0 0 0
scratch 393G 1.90T 0 0 0 0
scratch 393G 1.90T 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
scratch 396G 1.89T 0 1.76K 6.39K 220M
c4t9d0 68.0G 628G 0 328 0 40.8M
c4t10d0 54.6G 93.4G 0 239 0 29.3M
c4t11d0 54.9G 243G 0 244 0 30.2M
c4t12d0 54.6G 243G 0 245 0 29.7M
c4t13d0 54.6G 243G 0 249 0 30.1M
c4t14d0 54.7G 243G 0 249 0 30.3M
c4t15d0 54.6G 243G 0 241 6.39K 29.8M
---------- ----- ----- ----- ----- ----- -----
Will
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