Hi,
One of my servers is experiencing extremely high latency on ada0, the problem occurs very often (almost every minute).
It is running FreeBSD 9.0 + ZFS v28.
I did replace the disk but it didn't solve the problem after it resilvered. I did move the data to another identical machine but the other one is running fine.
diskinfo -cvt on four disks is showing consistent performance. All are getting very similar results, so I assume that the problem is not due to the SATA cable or interface.
Is there anything wrong on zfs or FreeBSD? Or possibly the SATA cable?
Below is my server spec and zpool status:
- Intel Xeon 5335 Quad Core
- 8GB RAM
- 4 X 1TB Seagate HDD
One of my servers is experiencing extremely high latency on ada0, the problem occurs very often (almost every minute).
Code:
dT: 1.001s w: 1.000s filter: ada[0-9]$
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
10 23 1 4 1543 22 591 571.2 104.4| ada0
0 0 0 0 0.0 0 0 0.0 0.0| ada1
0 0 0 0 0.0 0 0 0.0 0.0| ada2
0 3 3 12 0.1 0 0 0.0 0.0| ada3
0 125 125 1026 0.1 0 0 0.0 1.7| ada4
It is running FreeBSD 9.0 + ZFS v28.
I did replace the disk but it didn't solve the problem after it resilvered. I did move the data to another identical machine but the other one is running fine.
diskinfo -cvt on four disks is showing consistent performance. All are getting very similar results, so I assume that the problem is not due to the SATA cable or interface.
Is there anything wrong on zfs or FreeBSD? Or possibly the SATA cable?
Below is my server spec and zpool status:
Code:
pool: vol
state: ONLINE
scan: scrub repaired 0 in 7h34m with 0 errors on Wed Jun 13 20:00:30 2012
config:
NAME STATE READ WRITE CKSUM
vol ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ada1p3 ONLINE 0 0 0
ada0p3 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ada2p3 ONLINE 0 0 0
ada3p3 ONLINE 0 0 0
cache
ada4 ONLINE 0 0 0
errors: No known data errors
pool: zroot
state: ONLINE
scan: scrub repaired 0 in 0h3m with 0 errors on Wed Jun 13 12:26:49 2012
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ada1p2 ONLINE 0 0 0
ada0p2 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ada2p2 ONLINE 0 0 0
ada3p2 ONLINE 0 0 0
# zdb | grep ashift
ashift: 12
ashift: 12
ashift: 12
ashift: 12
- Intel Xeon 5335 Quad Core
- 8GB RAM
- 4 X 1TB Seagate HDD