On Thu, Sep 10, 2015 at 1:07 PM, Kyle Hutson wrote:
> A 'rados -p cachepool ls' takes about 3 hours - not exactly useful.
>
> I'm intrigued that you say a single read may not promote it into the cache.
> My understanding is that if you have an EC-backed pool the clients can't
> talk to them direct
On Wed, Sep 9, 2015 at 5:34 PM, Gregory Farnum wrote:
> On Wed, Sep 9, 2015 at 3:27 PM, Kyle Hutson wrote:
>> We are using Hammer - latest released version. How do I check if it's
>> getting promoted into the cache?
>
> Umm...that's a good question. You can run rados ls on the cache pool,
> but t
A 'rados -p cachepool ls' takes about 3 hours - not exactly useful.
I'm intrigued that you say a single read may not promote it into the cache.
My understanding is that if you have an EC-backed pool the clients can't
talk to them directly, which means they would necessarily be promoted to
the cach
On Wed, Sep 9, 2015 at 4:26 PM, Kyle Hutson wrote:
>
>
> On Wed, Sep 9, 2015 at 9:34 AM, Gregory Farnum wrote:
>>
>> On Wed, Sep 9, 2015 at 3:27 PM, Kyle Hutson wrote:
>> > We are using Hammer - latest released version. How do I check if it's
>> > getting promoted into the cache?
>>
>> Umm...tha
On Wed, Sep 9, 2015 at 9:34 AM, Gregory Farnum wrote:
> On Wed, Sep 9, 2015 at 3:27 PM, Kyle Hutson wrote:
> > We are using Hammer - latest released version. How do I check if it's
> > getting promoted into the cache?
>
> Umm...that's a good question. You can run rados ls on the cache pool,
> bu
On Wed, Sep 9, 2015 at 3:27 PM, Kyle Hutson wrote:
> We are using Hammer - latest released version. How do I check if it's
> getting promoted into the cache?
Umm...that's a good question. You can run rados ls on the cache pool,
but that's not exactly scalable; you can turn up logging and dig into
We are using Hammer - latest released version. How do I check if it's
getting promoted into the cache?
We're using the latest ceph kernel client. Where do I poke at readahead
settings there?
On Tue, Sep 8, 2015 at 8:29 AM, Gregory Farnum wrote:
> On Thu, Sep 3, 2015 at 11:58 PM, Kyle Hutson wr
On Thu, Sep 3, 2015 at 11:58 PM, Kyle Hutson wrote:
> I was wondering if anybody could give me some insight as to how CephFS does
> its caching - read-caching in particular.
>
> We are using CephFS with an EC pool on the backend with a replicated cache
> pool in front of it. We're seeing some very
Cephfs can use fscache. I am testing it at the moment.
Some lines from my deployment process:
sudo apt-get install linux-generic-lts-utopic cachefilesd
sudo reboot
sudo mkdir /mnt/cephfs
sudo mkdir /mnt/ceph_cache
sudo mkfs -t xfs /dev/md3 # A 100gb local raid partition
sudo bash -c "echo /dev/md
I was wondering if anybody could give me some insight as to how CephFS does
its caching - read-caching in particular.
We are using CephFS with an EC pool on the backend with a replicated cache
pool in front of it. We're seeing some very slow read times. Trying to
compute an md5sum on a 15GB file t
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