Garrett Cooper yanegomi at
Wed Nov 9 07:02:54 UTC 2011

On Tue, Nov 8, 2011 at 10:28 PM, Daniel O'Connor <doconnor at> wrote:
> On 09/11/2011, at 16:56, Daniel O'Connor wrote:
>> On 09/11/2011, at 16:29, Kurt Touet wrote:
>>> Is anyone else seeing problems like this with samba/zfs ?    Perhaps
>>> it's not exclusive to samba, either?
>> Yep, I see this too.
>> I can get 80-100Mbyte/sec reads out of a single disk but ZFS is (now) very slow - it reads & writes and much more slowly (10-30MB/sec).
>> When the array was fresh it was nice and fast - it is now 68% full and hasn't been much more full than that (I don't know but am pretty sure it never reach past 75%).
>> The frustrating thing is trying to find some way of measuring what's actually going on.. I haven't had much luck :
> Note that this is not restricted to Samba and while the server is not completely idle it's not doing very much.
> dd's of large files (spooled backups going to tape) to /dev/null are as slow as Samba.

    - Dedupe?
    - Compression?
    - How much RAM?
    - What debug options do you have enabled in the kernel?
    I've been noticing a slowdown in some respects with NFS/SMB, but I
suspected it was because I have an re(4) based NIC. ZFS has also wired
down a lot of my system memory for the L2ARC...

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