Questions for ZFS experts

[GSR_WildCard]

Anyone has tried or am using Native ZFS on Ubuntu?
https://launchpad.net/~zfs-native/+archive/stable

Been on OpenIndiana for some time and due to a complicated disk fault, had to resort to using the above to get back my data.
Now am trying out Ubuntu 12.04 as I have more expertise on Ubuntu and it has all the right tools I need to look after it (vs OI or Solaris Express).

I've tested it before for some time in the office but has a niggling issue right now.

Copy speed from my PC to the server is fast (~100 MB/s).
But copy speed from the server is abysmal (~30 MB/s).

Can't be my PC as on the earlier OI system, am having consistent speeds both ways (~110 MB/s).

Specs:
Asus P8H77-I mainboard using an Intel G1610
8GB RAM
6x Seagate Barracuda 7200s (all on mainboard SATA ports AHCI mode)
1x Hitachi 160GB 2.5" on a generic JMB363 RAID card (OS drive)
Ubuntu 12.04

I know about the rule of thumb of 1GB RAM per 1TB of data but that applies for dedup and I did disabled that and compression.

Also, I read up Ubuntu 12.04 installing the wrong default driver for the Realtek RTL111F (8169 instead of 8168).
Fixed that last night.

Any inputs?

 

[davidktw]

Anyone has tried or am using Native ZFS on Ubuntu?
https://launchpad.net/~zfs-native/+archive/stable

Been on OpenIndiana for some time and due to a complicated disk fault, had to resort to using the above to get back my data.
Now am trying out Ubuntu 12.04 as I have more expertise on Ubuntu and it has all the right tools I need to look after it (vs OI or Solaris Express).

I've tested it before for some time in the office but has a niggling issue right now.

Copy speed from my PC to the server is fast (~100 MB/s).
But copy speed from the server is abysmal (~30 MB/s).

Can't be my PC as on the earlier OI system, am having consistent speeds both ways (~110 MB/s).

Specs:
Asus P8H77-I mainboard using an Intel G1610
8GB RAM
6x Seagate Barracuda 7200s (all on mainboard SATA ports AHCI mode)
1x Hitachi 160GB 2.5" on a generic JMB363 RAID card (OS drive)
Ubuntu 12.04

I know about the rule of thumb of 1GB RAM per 1TB of data but that applies for dedup and I did disabled that and compression.

Also, I read up Ubuntu 12.04 installing the wrong default driver for the Realtek RTL111F (8169 instead of 8168).
Fixed that last night.

Any inputs?

Lets isolate where is the bottleneck. Do a dump from /dev/zero to the ZFS on your Linux OS and see if it's the disk is slowing you down. If it's not, then its your your network which could be NIC or cable related.

Are you using zfssend to export your data from your OpenIndiana to Ubuntu ?

 

[GSR_WildCard]

Lets isolate where is the bottleneck. Do a dump from /dev/zero to the ZFS on your Linux OS and see if it's the disk is slowing you down. If it's not, then its your your network which could be NIC or cable related.

I'll give it a try when I get back home. But again, copying to the ZFS pool is fine. Copying out is the issue.

Are you using zfssend to export your data from your OpenIndiana to Ubuntu ?

Nope. The story was, the 2nd disk in my array hard some bit errors mostly attributed to a flaky cable, causing ZFS to put it into FAULTED status. Normally I'd just do a OFFLINE->UNCONFIGURE->manually check cable and disk->CONFIGURE->ONLINE->CLEAR and it'll be ok. In this instance, I replaced the cable (since it was repeatedly faulting and I knew disk was fine since I did a few tests on it before). Unfortunately, at the same time, the 1st disk started to have a motor burnout. Did not get FAULTED but was impacted performance enough that ZFS started a full scrub. With the dying motor, scrub process grinded down to like 11.1kb/s on a 2.48TB dataset. Attempts to stop the scrub gets a suspended pool IO message. Even attempting to export it.

So I spent May Day installing Ubuntu 12.04 and ZFSonLinux and attempted to import the pool in forcefully. It worked and I was somehow able to stop the scrub job, repaired the issue with the 2nd drive, took 1st drive offline and had it RMAed.

Under normal circumstances, I'd go back to OI but just wanna see if I can iron out this last issue as I'd love to stick with Ubuntu and ZoL.