That's true, but if you look at slides 24 25 of
http://www.ddrdrive.com/zil_accelerator.pdf you'll see seek distributions for a
SLOG device with the ZILs for five filesystems - although each ZIL is broadly
append only (slides 21 and 22), there is still a lot of seeking going on. Of
course if
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On 07/06/12 17:06, Bob Friesenhahn wrote:
On Thu, 7 Jun 2012, Jesus Cea wrote:
I always wondered WHY. What is the point of keeping separate ZILs
(one per dataset) when having a discrete LOG device.
Any idea?.
The implementation is obviously
Yes, it's interesting to consider the possible real world performance. ZIL
writes, even by DDRDrive's stats, are very closely clustered around the tail of
the ZIL, with most seeks being to near locations - it's certainly not going to
seek more than 8 gig away. So probably just leaving it at
On Wed, 6 Jun 2012, Matt Clark wrote:
Yes, it's interesting to consider the possible real world
performance. ZIL writes, even by DDRDrive's stats, are very closely
clustered around the tail of the ZIL, with most seeks being to near
locations - it's certainly not going to seek more than 8 gig
On Tue, Jun 5, 2012 at 11:32 AM, Nick Hall darknovan...@gmail.com wrote:
On Mon, Jun 4, 2012 at 10:48 AM, Jan Owoc jso...@gmail.com wrote:
The data on the main pool is always consistent in that a certain
operation either made it to the disk or it didn't. However, if your
application depends
On Tue, 5 Jun 2012, Jan Owoc wrote:
Some applications may depend on the files (or portions thereof) making
it out to disk in a specific order. The example you gave is perfect.
Let's say file A needs to exist before a change in file B happens.
A properly written program would write out file A,
I'm considering buying a separate SSD drive for my ZIL as I do quite a bit
over NFS and would like the latency to improve. But first I'm trying to
understand exactly how the ZIL works and what happens in case of a problem.
I'll list my understanding here, and I'm hoping someone can correct me if
On Mon, Jun 4, 2012 at 9:24 AM, Nick Hall darknovan...@gmail.com wrote:
I'm considering buying a separate SSD drive for my ZIL as I do quite a bit
over NFS and would like the latency to improve. But first I'm trying to
understand exactly how the ZIL works and what happens in case of a problem.
On Jun 4, 2012, at 8:24 AM, Nick Hall wrote:
I'm considering buying a separate SSD drive for my ZIL as I do quite a bit
over NFS and would like the latency to improve. But first I'm trying to
understand exactly how the ZIL works and what happens in case of a problem.
I'll list my
You might supplement the advice you get here with this post from
Constantin Gonzales on his blog. I found it very helpful when I was
setting up my Solaris storage server.
http://constantin.glez.de/blog/2010/07/solaris-zfs-synchronous-writes-and-zil-explained
-Mark
On Mon, Jun 4, 2012 at 11:24
On 6/4/2012 11:56 AM, Richard Elling wrote:
On Jun 4, 2012, at 8:24 AM, Nick Hall wrote:
For NFS workloads, the ZIL implements the synchronous semantics between
the NFS server and client. The best way to get better performance is to have the
client run in async mode when possible (Solaris
On Jun 4, 2012, at 10:06 AM, Dan Swartzendruber wrote:
On 6/4/2012 11:56 AM, Richard Elling wrote:
On Jun 4, 2012, at 8:24 AM, Nick Hall wrote:
For NFS workloads, the ZIL implements the synchronous semantics between
the NFS server and client. The best way to get better performance is to have
On 6/4/2012 1:15 PM, Richard Elling wrote:
On Jun 4, 2012, at 10:06 AM, Dan Swartzendruber wrote:
On 6/4/2012 11:56 AM, Richard Elling wrote:
On Jun 4, 2012, at 8:24 AM, Nick Hall wrote:
For NFS workloads, the ZIL implements the synchronous semantics between
the NFS server and client. The
: [OpenIndiana-discuss] What happens when a ZIL drive dies?
I'm considering buying a separate SSD drive for my ZIL as I do quite a
bit over NFS and would like the latency to improve. But first I'm trying
to understand exactly how the ZIL works and what happens in case of a
problem.
I'll list my
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