How reliable are the SSDs, including actual non-corrected BER, and what 
is the failure rate / interval ?

If a ZFS log on a SSD fails, what happens?  Is the log automagically 
recreated on a secondary SSD?  Are the drives (spinning and/or SSD) 
mirrored? Are primary (non-log) data lost?

Yasha Karant

On 07/25/2013 09:56 AM, Graham Allan wrote:
> It's not so bad if you build the system taking these things into account
> (much easier if you wait long enough to read about others' experiences
> :-). We built our BSD ZFS systems using inexpensive Intel 313 SSDs for
> the log devices. I can't say that they're the best possible choice,
> opinions vary all over the map, but the box is currently happily
> accepting 2Gbps continuous NFS writes, which seems pretty decent.
>
> Graham
>
> On 7/24/2013 5:36 PM, Paul Robert Marino wrote:
>> ZFS is a performance nightmare if you plan to export it via NFS because
>> of a core design conflict with how NFS locking and the ZIL journal in
>> ZFS. Its not just a linux issue it effects Solaris and BSD as well. My
>> only experience with ZFS was on a Solaris NFS server and we had to get a
>> dedicated flash backed ram drive for the ZIL to fix our performance
>> issues, and let me tell you sun charged us a small fortune for the card.
>> Aside from that most of the cool features are available in XFS if you
>> dive deep enough into the documentation though most of them like multi
>> disk spanning can be handled now by LVM or MD but are at least in my
>> opinion handled better by hardware raid. Though I will admit the being
>> able to move your journal to a separate faster volume to increase
>> performance is very cool and that's only a feature I've seen in XFS
>> and ZFS.