vvizard
Cadet
- Joined
- Dec 29, 2012
- Messages
- 3
Hi, I just rebuilt my array. I used to have a 6-disk raidz2 (6x3TB Seagate Barracudas) which I now have rebuilt to a 8 disk array mixing the before mentioned Barracuda's with two new WD RED drives. The performance is very poor now. I get read/write speeds around 70MB/s on the array, while before I'm pretty sure I had at least 150MB/s.
All drives are connected to a LSI 8P SAS-controller (same controller as used previously)
The computer has a 3GHz i3 CPU and 16GB RAM.
I have lzjb compression turned on (think I did before)
Sector sizes are (according to zfs cache) 512k (ashift=9). Might have used the "force 4k sector sizes last time, not sure".
These speeds are not tolerable for my use. Anyone knows what might cause this? Could it be that 8 disks is an "odd" size for raidz2, and that I should either put in another disk and move to raidz3 or split into volumes? Help appreciated.
EDIT: Not sure how much 512k sectors would hamper speed? From a post I've read somewhere, it was stated that it would probably not be "visible" for the user speedwise though.
All drives are connected to a LSI 8P SAS-controller (same controller as used previously)
The computer has a 3GHz i3 CPU and 16GB RAM.
I have lzjb compression turned on (think I did before)
Sector sizes are (according to zfs cache) 512k (ashift=9). Might have used the "force 4k sector sizes last time, not sure".
These speeds are not tolerable for my use. Anyone knows what might cause this? Could it be that 8 disks is an "odd" size for raidz2, and that I should either put in another disk and move to raidz3 or split into volumes? Help appreciated.
EDIT: Not sure how much 512k sectors would hamper speed? From a post I've read somewhere, it was stated that it would probably not be "visible" for the user speedwise though.