This smells of name resolution delays somewhere.
[...]
I think you've misunderstood something here, perhaps in the way I've tried
to explain it.
No, I was just offering a hunch. Writing files into a directory checks
access permissions for that directory, and that involves name services.
It
This smells of name resolution delays somewhere.
[...]
I think you've misunderstood something here, perhaps in the way I've tried
to explain it.
No, I was just offering a hunch. Writing files into a directory checks
access permissions for that directory, and that involves name services.
It
I've done some more research, but would still greatly appreciate someone
helping me understand this.
It seems that writes to only the home directory of the person logged in to the
console suffers from degraded performance. If I write to a subdirectory
beneath my home, or to any other
William Bauer wrote:
I've done some more research, but would still greatly appreciate someone
helping me understand this.
It seems that writes to only the home directory of the person logged in to the
console suffers from degraded performance. If I write to a subdirectory
beneath my home,
If that were the case, why would it matter if I was logged into the console,
and why would subdirectories of my home exhibit better write performance than
the top level home directory? A write to /export/home/username is slower than
to /export/home/username/blah, but ONLY if that user is
On Sun, 26 Oct 2008, William Bauer wrote:
This has proven true on every OpenSolaris system I've tried--all of
which are using ZFS. So what is it about logging into the console
that slows write performance to ONLY the top level home directory of
the username on the same console?
Recently
If that were the case, why would it matter if I was logged into the console,
and why would subdirectories of my home exhibit better write performance
than the top level home directory? A write to /export/home/username is
slower than to /export/home/username/blah, but ONLY if that user is
This smells of name resolution delays somewhere. Do
you have
a shell prompt that gets some host name or user name
from
name services? Is your /home directory owned by a
non-existing
user or group? Do you accidentally have something
enabled
in /etc/nsswitch.conf that does not exist
This sounds plausible I suppose Being unfamiliar with this tracker daemon,
I can blindly accept it as a maybe!
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For clarity, here's how you can reproduce what I'm asking about:
This is for local file systems on build 86 and not about NFS or
any remote mounts. You can repeat these 100 times and always get
the same result, whether you reboot between trials or leave the
system running.
1. Log into the
I cannot recreate this on b101. There is no significant difference between
the two on my system.
-- richard
William Bauer wrote:
For clarity, here's how you can reproduce what I'm asking about:
This is for local file systems on build 86 and not about NFS or
any remote mounts. You can repeat
I cannot recreate this on b101. There is no significant difference between
the two on my system.
That's encouraging...unless no one can reproduce it on 86, then I'm forgetting
something. I've done this a dozen times on several systems, so maybe ZFS
performance has been improved.
What
Bingo! I just updated a system from 86 to 99 and the problem is gone. Even
better, it was a VB guest, and the ZFS performance on the guest increased 5x in
this test, as I mentioned earlier. Granted, a VB guest may not be the best
test and it only applies to top level home directories, but it
After a zpool upgrade, this simple test's write speed jumped up yet another
20%. Looks like ZFS is getting better. As one would hope expect.
--
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I apologize if this has been addressed countless times, but I have searched
searched and have not found the answer.
I'm rather new to ZFS and have learned a lot about it so far. At least one
thing confuses me, however. I've noticed that writes to the boot disk in
OpenSolaris (i.e. pool
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