raidz only delivering 35% of single disk performance

[Kupo]

Hello All,

I am experiencing a weird issue reading and writing to my zpool, it appears i can only get around 35% of my max disk performance in with my raid5 setup via ZFS.

Code:

freenas# dd if="/mnt/vol1/large.mkv" of=/dev/null bs=10M
812+1 records in
812+1 records out
8519510546 bytes transferred in 96.639954 secs (88157229 bytes/sec)

freenas# dd if=/dev/ada0 of=/dev/null bs=10M count=1000
1000+0 records in
1000+0 records out
10485760000 bytes transferred in 75.579703 secs (138737777 bytes/sec)
freenas# dd if=/dev/ada1 of=/dev/null bs=10M count=1000
1000+0 records in
1000+0 records out
10485760000 bytes transferred in 75.201745 secs (139435062 bytes/sec)
freenas# dd if=/dev/ada2 of=/dev/null bs=10M count=1000
1000+0 records in
1000+0 records out
10485760000 bytes transferred in 72.971260 secs (143697121 bytes/sec)
freenas# dd if=/dev/ada3 of=/dev/null bs=10M count=1000
1000+0 records in
1000+0 records out
10485760000 bytes transferred in 90.113132 secs (116362175 bytes/sec)

freenas# zpool status
  pool: vol1
 state: ONLINE
 scrub: none requested
config:

        NAME          STATE     READ WRITE CKSUM
        vol1          ONLINE       0     0     0
          raidz1      ONLINE       0     0     0
            gpt/ada0  ONLINE       0     0     0
            gpt/ada1  ONLINE       0     0     0
            gpt/ada2  ONLINE       0     0     0
            gpt/ada3  ONLINE       0     0     0

errors: No known data errors

freenas# dd if=/dev/zero of=test bs=100024 count=50000
50000+0 records in
50000+0 records out
5001200000 bytes transferred in 88.269919 secs (56658033 bytes/sec)
freenas# dd if=test of=/dev/zero bs=100024 count=50000
50000+0 records in
50000+0 records out
5001200000 bytes transferred in 83.260203 secs (60067113 bytes/sec)

Does anyone have any suggestions to fix this?

 

[Milhouse]

ZFS loves memory. How much RAM you have in your NAS?

Which build of FreeNAS 8.0.1-RELEASE are you using, i386 (32-bit) or AMD/x64 (64-bit)?

 

[Kupo]

ZFS loves memory. How much RAM you have in your NAS?

Which build of FreeNAS 8.0.1-RELEASE are you using, i386 (32-bit) or AMD/x64 (64-bit)?

freenas# dmesg | grep memory
real memory = 4294967296 (4096 MB)
avail memory = 3680661504 (3510 MB)

How do I check the version of Freenas?

Code:

freenas# uname -a
FreeBSD freenas.local 8.2-RELEASE-p1 FreeBSD 8.2-RELEASE-p1 #4: Sat Apr 30 10:39:46 PDT 2011     jpaetzel@servant.iXsystems.com:/usr/home/jpaetzel/freenas/obj.amd64/usr/home/jpaetzel/freenas/FreeBSD/src/sys/FREENAS.amd64  amd64