Re: samba+zfs


On Tue, Nov 8, 2011 at 10:28 PM, Daniel O'Connor <doconnor@gsoft.com.au> wr=
ote:
>
> 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 ? =A0 =A0Perhap=
s
>>> 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) ve=
ry 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 h=
asn't been much more full than that (I don't know but am pretty sure it nev=
er reach past 75%).
>>
>> The frustrating thing is trying to find some way of measuring what's act=
ually going on.. I haven't had much luck :
>
>
> Note that this is not restricted to Samba and while the server is not com=
pletely idle it's not doing very much.
>
> dd's of large files (spooled backups going to tape) to /dev/null are as s=
low 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...
Thanks,
-Garrett
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