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All ssd zfs pool, slow write

drolfeMay 8 2016 — edited Jun 14 2016

HI, I've got 3x samsung evo 850 1TB's in a 3disk stripe as below:

root@ssd-san:~# zpool status tank

pool: tank

state: ONLINE

scan: none requested

config:

NAME STATE READ WRITE CKSUM

tank ONLINE 0 0 0

c0t500253884001571Cd0 ONLINE 0 0 4

c0t50025388400178DAd0 ONLINE 0 0 5

c0t5002538840015719d0 ONLINE 0 0 12

errors: No known data errors

root@ssd-san:~#

Doing DD testing from the client shows the below:

[root@centos7.2 home]# dd if=/dev/zero of=temfile bs=1M count=1024 conv=fsync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.1407 s, 502 MB/s
[root@centos7.2 home]#

Note the sharing is via a 40g infiniband SRP target so there is more than enough bandwidth between server and client

Any Ideas why I can't seem to get over 500MB/s on a 3x1TB SSD stripe ?

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Locked on Jul 12 2016

Added on May 8 2016

#oracle-solaris, #solaris-11

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