Hi Robert,
Thanks for your replay. We understand the senarios.
Thanks for your replay. We understand the senarios.
Regards
Prabu
---- On Thu, 20 Aug 2015 00:15:41 +0530 robert@xxxxxxxxxxxxx wrote ---------BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
By default, all pools will use all OSDs. Each RBD, for instance, is
broken up into 4 MB objects and those objects are somewhat uniformly
distributed between the OSDs. When you add another OSD, the CRUSH map
is recalculated and the OSDs shuffle the objects to their new
locations somewhat uniformly distributing them across all available
OSDs.
I say uniformly distributed because it is based on the hashing
algorithm of the name and size is not taken into account. So you may
have more larger objects on some OSDs than others. The number of PGs
affect the ability to more uniformly distribute the data (more hash
buckets for data to land in).
You can create CRUSH rules that limit selection of OSDs to a subset
and then configure a pool to use those rules. This is a pretty
advanced configuration option.
I hope that helps with your question.
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----------------
Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Tue, Aug 18, 2015 at 8:26 AM, gjprabu <gjprabu@xxxxxxxxxxxx> wrote:
> Hi Luis,
>
> What i mean , we have three OSD with Harddisk size each 1TB and two
> pool (poolA and poolB) with replica 2. Here writing behavior is the
> confusion for us. Our assumptions is below.
>
> PoolA -- may write with OSD1 and OSD2 (is this correct)
>
> PoolB -- may write with OSD3 and OSD1 (is this correct)
>
> suppose the hard disk size got full , then how many OSD's need to be added
> and How will be the writing behavior to new OSD's
>
> After added few osd's
>
> PoolA -- may write with OSD4 and OSD5 (is this correct)
> PoolB -- may write with OSD5 and OSD6 (is this correct)
>
>
> Regards
> Prabu
>
> ---- On Mon, 17 Aug 2015 19:41:53 +0530 Luis Periquito <periquito@xxxxxxxxx>
> wrote ----
>
> I don't understand your question? You created a 1G RBD/disk and it's full.
> You are able to grow it though - but that's a Linux management issue, not
> ceph.
>
> As everything is thin-provisioned you can create a RBD with an arbitrary
> size - I've create one with 1PB when the cluster only had 600G/Raw
> available.
>
> On Mon, Aug 17, 2015 at 1:18 PM, gjprabu <gjprabu@xxxxxxxxxxxx> wrote:
>
> Hi All,
>
> Anybody can help on this issue.
>
> Regards
> Prabu
>
> ---- On Mon, 17 Aug 2015 12:08:28 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote
> ----
>
> Hi All,
>
> Also please find osd information.
>
> ceph osd dump | grep 'replicated size'
> pool 2 'repo' replicated size 2 min_size 2 crush_ruleset 0 object_hash
> rjenkins pg_num 126 pgp_num 126 last_change 21573 flags hashpspool
> stripe_width 0
>
> Regards
> Prabu
>
>
>
>
> ---- On Mon, 17 Aug 2015 11:58:55 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote
> ----
>
>
>
> Hi All,
>
> We need to test three OSD and one image with replica 2(size 1GB). While
> testing data is not writing above 1GB. Is there any option to write on third
> OSD.
>
> ceph osd pool get repo pg_num
> pg_num: 126
>
> # rbd showmapped
> id pool image snap device
> 0 rbd integdownloads - /dev/rbd0 -- Already one
> 2 repo integrepotest - /dev/rbd2 -- newly created
>
>
> [root@hm2 repository]# df -Th
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/sda5 ext4 289G 18G 257G 7% /
> devtmpfs devtmpfs 252G 0 252G 0% /dev
> tmpfs tmpfs 252G 0 252G 0% /dev/shm
> tmpfs tmpfs 252G 538M 252G 1% /run
> tmpfs tmpfs 252G 0 252G 0% /sys/fs/cgroup
> /dev/sda2 ext4 488M 212M 241M 47% /boot
> /dev/sda4 ext4 1.9T 20G 1.8T 2% /var
> /dev/mapper/vg0-zoho ext4 8.6T 1.7T 6.5T 21% /zoho
> /dev/rbd0 ocfs2 977G 101G 877G 11% /zoho/build/downloads
> /dev/rbd2 ocfs2 1000M 1000M 0 100% /zoho/build/repository
>
> @:~$ scp -r sample.txt root@integ-hm2:/zoho/build/repository/
> root@integ-hm2's password:
> sample.txt
> 100% 1024MB 4.5MB/s 03:48
> scp: /zoho/build/repository//sample.txt: No space left on device
>
> Regards
> Prabu
>
>
>
>
> ---- On Thu, 13 Aug 2015 19:42:11 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote
> ----
>
>
>
> Dear Team,
>
> We are using two ceph OSD with replica 2 and it is working
> properly. Here my doubt is (Pool A -image size will be 10GB) and its
> replicated with two OSD, what will happen suppose if the size reached the
> limit, Is there any chance to make the data to continue writing in another
> two OSD's.
>
> Regards
> Prabu
>
>
>
>
>
>
>
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>
>
>
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