On Sep 26, 2012, at 4:28 AM, Sašo Kiselkov wrote:
> On 09/26/2012 01:14 PM, Edward Ned Harvey
> (opensolarisisdeadlongliveopensolaris) wrote:
>>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>>> boun...@opensolaris.org] On Behalf Of Jim Klimov
>>>
>>> Got me wondering: how man
On 09/26/2012 01:14 PM, Edward Ned Harvey
(opensolarisisdeadlongliveopensolaris) wrote:
>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>> boun...@opensolaris.org] On Behalf Of Jim Klimov
>>
>> Got me wondering: how many reads of a block from spinning rust
>> suffice for it to ult
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Jim Klimov
>
> Got me wondering: how many reads of a block from spinning rust
> suffice for it to ultimately get into L2ARC? Just one so it
> gets into a recent-read list of the ARC and then ex
On 09/25/2012 09:38 PM, Jim Klimov wrote:
> 2012-09-11 16:29, Edward Ned Harvey
> (opensolarisisdeadlongliveopensolaris) wrote:
>>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>>> boun...@opensolaris.org] On Behalf Of Dan Swartzendruber
>>>
>>> My first thought was everything is
On 9/25/2012 3:38 PM, Jim Klimov wrote:
2012-09-11 16:29, Edward Ned Harvey
(opensolarisisdeadlongliveopensolaris) wrote:
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Dan Swartzendruber
My first thought was everything is
hitting in ARC, bu
2012-09-11 16:29, Edward Ned Harvey
(opensolarisisdeadlongliveopensolaris) wrote:
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Dan Swartzendruber
My first thought was everything is
hitting in ARC, but that is clearly not the case, since it
Subject: Re: [zfs-discuss] Interesting question about L2ARC
On 09/11/2012 04:06 PM, Dan Swartzendruber wrote:
> Thanks a lot for clarifying how this works.
You're very welcome.
> Since I'm quite happy
> having an SSD in my workstation, I will need to purchase another SSD
> :)
-Original Message-
From: Sašo Kiselkov [mailto:skiselkov...@gmail.com]
Sent: Tuesday, September 11, 2012 10:12 AM
To: Dan Swartzendruber
Cc: 'James H'; zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] Interesting question about L2ARC
On 09/11/2012 04:06 PM, Dan Swar
On 09/11/2012 04:06 PM, Dan Swartzendruber wrote:
> Thanks a lot for clarifying how this works.
You're very welcome.
> Since I'm quite happy
> having an SSD in my workstation, I will need to purchase another SSD :) I'm
> wondering if it makes more sense to buy two SSDs of half the size (e.g.
>
-Original Message-
From: Sašo Kiselkov [mailto:skiselkov...@gmail.com]
Sent: Tuesday, September 11, 2012 9:52 AM
To: Dan Swartzendruber
Cc: 'James H'; zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] Interesting question about L2ARC
On 09/11/2012 03:41 PM, Dan Swar
On 09/11/2012 03:41 PM, Dan Swartzendruber wrote:
> LOL, I actually was unclear not you. I understood what you were saying,
> sorry for being unclear. I have 4 disks in raid10, so my max random read
> throughput is theoretically somewhat faster than the L2ARC device, but I
> never really do that
ris.org
Subject: Re: [zfs-discuss] Interesting question about L2ARC
On 09/11/2012 03:32 PM, Dan Swartzendruber wrote:
> I think you may have a point. I'm also inclined to enable prefetch
> caching per Saso's comment, since I don't have massive throughput -
> latency is mo
On 09/11/2012 03:32 PM, Dan Swartzendruber wrote:
> I think you may have a point. I'm also inclined to enable prefetch caching
> per Saso's comment, since I don't have massive throughput - latency is more
> important to me.
I meant to say the exact opposite: enable prefetch caching only if your
l
g] On Behalf Of James H
Sent: Tuesday, September 11, 2012 5:09 AM
To: zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] Interesting question about L2ARC
Dan,
If you're not already familiar with it, I find the following command useful.
It shows the realtime total read commands, number
ubject: RE: [zfs-discuss] Interesting question about L2ARC
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Dan Swartzendruber
>
> My first thought was everything is
> hitting in ARC, but that is clearly not the case, since it
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Dan Swartzendruber
>
> My first thought was everything is
> hitting in ARC, but that is clearly not the case, since it WAS gradually
> filling up
> the cache device.
When things become cold
Dan,
If you're not already familiar with it, I find the following command useful. It
shows the realtime total read commands, number hitting/missing ARC, number
hitting missing L2ARC, breakdown of MRU/MFU etc.
arcstat_v2.pl -f
read,hits,mru,mfu,miss,hit%,l2read,l2hits,l2miss,l2hit%,arcsz,l2size,mr
I got a 256GB Crucial M4 to use for L2ARC for my OpenIndiana box. I added
it to the tank pool and let it warm for a day or so. By that point, 'zpool
iostat -v' said the cache device had about 9GB of data, but (and this is
what has me puzzled) kstat showed ZERO l2_hits. That's right, zero.
kst
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