Some numbers...
zpool status
pool: Pool_sas
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
Pool_sas ONLINE 0 0 0
c4t5000C5000006A6D3d0 ONLINE 0 0 0
c4t5000C5000006A777d0 ONLINE 0 0 0
c4t5000C5000006AA43d0 ONLINE 0 0 0
c4t5000C5000006AC4Fd0 ONLINE 0 0 0
c4t5000C5000006AEF7d0 ONLINE 0 0 0
c4t5000C5000006B27Fd0 ONLINE 0 0 0
c4t5000C5000006B28Bd0 ONLINE 0 0 0
c4t5000C5000006B46Bd0 ONLINE 0 0 0
c4t5000C5000006B563d0 ONLINE 0 0 0
c4t5000C5000006B643d0 ONLINE 0 0 0
c4t5000C5000006B6D3d0 ONLINE 0 0 0
c4t5000C5000006BBE7d0 ONLINE 0 0 0
c4t5000C5000006C407d0 ONLINE 0 0 0
c4t5000C5000006C657d0 ONLINE 0 0 0
errors: No known data errors
pool: Pool_test
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
Pool_test ONLINE 0 0 0
c4t5000C5002103F093d0 ONLINE 0 0 0
c4t5000C50021101683d0 ONLINE 0 0 0
c4t5000C50021102AA7d0 ONLINE 0 0 0
c4t5000C500211034D3d0 ONLINE 0 0 0
c4t5000C500211035DFd0 ONLINE 0 0 0
c4t5000C5002110480Fd0 ONLINE 0 0 0
c4t5000C50021104F0Fd0 ONLINE 0 0 0
c4t5000C50021119A43d0 ONLINE 0 0 0
c4t5000C5002112392Fd0 ONLINE 0 0 0
errors: No known data errors
pool: syspool
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
syspool ONLINE 0 0 0
c0t0d0s0 ONLINE 0 0 0
errors: No known data errors
=========================================================
Pool_sas is made of 14x 146G 15K SAS Drives in a big stripe. For this test
there is no log device or cache. Connected to it is a RedHat box using iSCSI
through an Intel X520 10GbE NIC. It runs several large MySQL queries at once-
each taking minutes to compute.
Pool_test is a stripe of 2TB SATA drives and a terrabyte of files is being
copied to it for another box during this test.
Here's the pastebin of "iostat -xdn 10" on the Linux box:
http://pastebin.com/431ESYaz
Here's the pastebin of "iostat -xdn 10" on the Nexenta box:
http://pastebin.com/9g7KD3Ku
Here's the pastebin "zpool iostat -v 10" on the Nexenta box:
http://pastebin.com/05fJL5sw
>From these numbers it looks like the Linux box is waiting for data all the
>time while the Nexenta box isn't pulling nearly as much throughput and IOPS as
>it could. Where is the bottleneck?
One thing suspicious is that we notice a slow down of one pool when the other
is under load. How can that be?
Ian
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