ZFS: ZIL device export/import

[mxb]

Thanks everyone, whom replied!

//mxb

On 14 apr 2013, at 12:01, mxb <mxb at alumni.chalmers.se> wrote:

> 
> Well, I'm trying to preclude any undesired effect in the whole setup, as this is going to production.
> 
> SAS-link might not be a bottleneck here and I'm overreacting.
> 
> Locally ,on per HU basis, I have 6Gbit/s SAS/SATA. Both card and disks(SSD) attached to it.
> SAS Expander is also 6Gbit/s, attaching 10k RPM SAS mechanical disks on JBOD.
> 
> I use Intel 520 SSD and Pulsar SSD in this setup.
> ZIL resided locally on Intel SSD(per HU), but now will probably move to Pulsar SSD(moved to JBOD as those disks have dual SAS/SATA link). L2ARC resided on Pulsar (Pulsar was in each HU. eg. I have 2x Pulsar).
> 
> Looks like I have to re-design the whole setup, as of ZIL.
> 
> //mxb
> 
> 
> On 13 apr 2013, at 22:51, Ronald Klop <ronald-freebsd8 at klop.yi.org> wrote:
> 
>> I thought the idea of ZIL is a fast buffer before the write to slow disk. Are you really sure the SAS expander is the bottleneck in the system instead of the disks?
>