Okay…I think the extra layers you have will add some delay, but 1m is high probably (I never tested Ceph on HDD though). We can minimize it probably by optimizing the cluster setup. Please monitor your backend cluster or even the rbd nodes to see if anything is bottleneck there. Also, check if there is any delay between you are issuing request on OCFS2/rbd getting that/cluster getting that.
Could you please share the following details ? 1. What is your backend cluster configuration like how many OSDs, PGs/pool, HW details etc. 2. Is it a single big rbd image you mounted from different hosts and running OCFS2 on top ? Please give some details on that front. 3. Also, is this HDD or SSD setup ? If HDD, hope you have journals on SSD. Thanks & Regards Somnath From: gjprabu [mailto:gjpr...@zohocorp.com] Sent: Tuesday, June 16, 2015 1:57 AM To: Somnath Roy Cc: Kamala Subramani ; ceph-users@lists.ceph.com; Siva Sokkumuthu Subject: RE: Re: [ceph-users] Ceph OSD with OCFS2 Somnath , Yes , we are cloning repository in ceph client shared directory. Please refer the time analyzation Ceph Client Shared Directory : [s...@cephclient2.csez.zohoc<mailto:s...@zoho-cephclient2.csez.zohoc>orpin.com~/ceph/]$ time git clone https://github.com/elastic/elasticsearch.git Cloning into 'elasticsearch'... remote: Counting objects: 373468, done. remote: Compressing objects: 100% (76/76), done. remote: Total 373468 (delta 66), reused 20 (delta 20), pack-reused 373371 Receiving objects: 100% (373468/373468), 137.56 MiB | 7.10 MiB/s, done. Resolving deltas: 100% (210489/210489), done. Checking connectivity... done. Checking out files: 100% (5531/5531), done. real 1m2.154s user 0m26.315s sys 0m20.017s Not Shared Directory : [s...@cephclient2.csez.zohoc<mailto:s...@zoho-cephclient2.csez.zohoc>orpin.com~/test]$ time git clone https://github.com/elastic/elasticsearch.git Cloning into 'elasticsearch'... remote: Counting objects: 373594, done. remote: Compressing objects: 100% (172/172), done. remote: Total 373594 (delta 104), reused 20 (delta 20), pack-reused 373399 Receiving objects: 100% (373594/373594), 137.65 MiB | 8.30 MiB/s, done. Resolving deltas: 100% (210550/210550), done. real 0m37.878s user 0m20.061s sys 0m3.049s FYI : Not only clone - repository operation like checkout , update , fetch command also getting delayed . Regards Prabu ---- On Tue, 16 Jun 2015 10:35:32 +0530 Somnath Roy<somnath....@sandisk.com<mailto:somnath....@sandisk.com>> wrote ---- Prabu, I am still not clear.. You are cloning git source repository on top of RBD + OCFS2 and that is taking extra time ? Thanks & Regards Somnath From: gjprabu [mailto:gjpr...@zohocorp.com] Sent: Monday, June 15, 2015 9:39 PM To: gjprabu Cc: Somnath Roy; Kamala Subramani ; ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>; Siva Sokkumuthu Subject: Re: Re: [ceph-users] Ceph OSD with OCFS2 Hi Somnath, Is there any fine tune for the blow issues. << Also please let us know the reason ( Extra 2-3 mins is taken for hg / git repository operation like clone , pull , checkout and update.) << Could you please explain a bit what you are trying to do here ? In ceph shared directory , we will clone source repository then will access the same from ceph client . Regards Prabu ---- On Mon, 15 Jun 2015 17:16:11 +0530 gjprabu <gjpr...@zohocorp.com<mailto:gjpr...@zohocorp.com>> wrote ---- Hi The size differ issue is solved, This is related to ocfs2 format option and -C count should be 4K. (mkfs.ocfs2 /dev/mapper/mpatha -N 64 -b 4K -C 256K -T mail --fs-features=extended-slotmap --fs-feature-level=max-features -L ) Need to change like below. (mkfs.ocfs2 /dev/mapper/mpatha -b4K -C 4K -L label -T mail -N 2 /dev/sdX << Also please let us know the reason ( Extra 2-3 mins is taken for hg / git repository operation like clone , pull , checkout and update.) << Could you please explain a bit what you are trying to do here ? In ceph shared directory , we will clone source repository then will access the same from ceph client . Regards Prabu ---- On Fri, 12 Jun 2015 21:12:03 +0530 Somnath Roy <somnath....@sandisk.com<mailto:somnath....@sandisk.com>> wrote ---- Sorry, it was a typo , I meant to say 1GB only. I would say break the problem like the following. 1. Run some fio workload say (1G) on RBD and run ceph command like ‘ceph df’ to see how much data it written. I am sure you will be seeing same data. Remember by default ceph rados object size is 4MB, so, it should write 1GB/4MB number of objects. 2. Also, you can use ‘rados’ utility to directly put/get say 1GB file to the cluster and check similar way. As I said, if your journal in the same device and if you measure the space consumed by entire OSD mount point , it will be more because of WA induced by Ceph. But, individual file size you transferred should not differ. << Also please let us know the reason ( Extra 2-3 mins is taken for hg / git repository operation like clone , pull , checkout and update.) Could you please explain a bit what you are trying to do here ? Thanks & Regards Somnath From: gjprabu [mailto:gjpr...@zohocorp.com<mailto:gjpr...@zohocorp.com>] Sent: Friday, June 12, 2015 12:34 AM To: Somnath Roy Cc: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>; Kamala Subramani ; Siva Sokkumuthu Subject: Re: RE: RE: [ceph-users] Ceph OSD with OCFS2 Hi, I measured the data only what i transfered from client. Example 500MB file transfered after complete if i measured the same file size will be 1GB not 10GB. Our Configuration is :- ============================================================================================= ceph -w cluster f428f5d6-7323-4254-9f66-56a21b099c1a health HEALTH_OK monmap e1: 3 mons at {cephadmin=172.20.19.235:6789/0,cephnode1=172.20.7.168:6789/0,cephnode2=172.20.9.41:6789/0}, election epoch 114, quorum 0,1,2 cephnode1,cephnode2,cephadmin osdmap e9: 2 osds: 2 up, 2 in pgmap v1022: 64 pgs, 1 pools, 7507 MB data, 1952 objects 26139 MB used, 277 GB / 302 GB avail 64 active+clean =============================================================================================== ceph.conf [global] osd pool default size = 2 auth_service_required = cephx filestore_xattr_use_omap = true auth_client_required = cephx auth_cluster_required = cephx mon_host = 172.20.7.168,172.20.9.41,172.20.19.235 mon_initial_members = zoho-cephnode1, zoho-cephnode2, zoho-cephadmin fsid = f428f5d6-7323-4254-9f66-56a21b099c1a ================================================================================================ What is the replication policy you are using ? We are using default OSD with 2 replica not using CRUSH Map, PG num and Erasure etc., What interface you used to store the data ? We are using RBD to store data and its has been mounted with OCFS2 in client side. How are you removing data ? Are you removing a rbd image ? We are not removing rbd image, only removing data which is already having and removing using rm command from client. We didn't set async way to transfer or remove data Also please let us know the reason ( Extra 2-3 mins is taken for hg / git repository operation like clone , pull , checkout and update.) Regards Prabu GJ ---- On Fri, 12 Jun 2015 00:21:24 +0530 Somnath Roy <somnath....@sandisk.com<mailto:somnath....@sandisk.com>> wrote ---- Hi, Ceph journal works in different way. It’s a write ahead journal, all the data will be persisted first in journal and then will be written to actual place. Journal data is encoded. Journal is a fixed size partition/file and written sequentially. So, if you are placing journal in HDDs, it will be overwritten, for SSD case , it will be GC later. So, if you are measuring amount of data written to the device it will be double. But, if you are saying you have written a 500MB file to cluster and you are seeing the actual file size is 10G, it should not be the case. How are you seeing this size BTW ? Could you please tell us more about your configuration ? What is the replication policy you are using ? What interface you used to store the data ? Regarding your other query.. << If i transfer 1GB data, what will be server size(OSD), Is this will write compressed format No, actual data is not compressed. You don’t want to fill up OSD disk and there are some limits you can set . Check the following link http://ceph.com/docs/master/rados/troubleshooting/troubleshooting-osd/ It will stop working if the disk is 95% full by default. << Is it possible to take backup from server compressed data and copy the same to other machine as Server_Backup - then start new client using Server_Backup For backup, check the following link if that works for you. https://ceph.com/community/blog/tag/backup/ Also, you can use RGW federated config for back up. << Data removal is very slow How are you removing data ? Are you removing a rbd image ? If you are removing entire pool , that should be fast and do deletes data async way I guess. Thanks & Regards Somnath From: gjprabu [mailto:gjpr...@zohocorp.com<mailto:gjpr...@zohocorp.com>] Sent: Thursday, June 11, 2015 6:38 AM To: Somnath Roy Cc: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>; Kamala Subramani; Siva Sokkumuthu Subject: Re: RE: [ceph-users] Ceph OSD with OCFS2 Hi Team, Once data transfer completed the journal file should convert all memory data's to real places but our cause it showing double of the size after complete transfer, Here everyone will confuse what is real file and folder size. Also What will happen If i move the monitoring from that osd server to separately, is the double size issue may solve ? We have below query also. 1. Extra 2-3 mins is taken for hg / git repository operation like clone , pull , checkout and update. 2. If i transfer 1GB data, what will be server size(OSD), Is this will write compressed format. 3 . Is it possible to take backup from server compressed data and copy the same to other machine as Server_Backup - then start new client using Server_Backup. 4. Data removal is very slow. Regards Prabu ---- On Fri, 05 Jun 2015 21:55:28 +0530 Somnath Roy <somnath....@sandisk.com<mailto:somnath....@sandisk.com>> wrote ---- Yes, Ceph will be writing twice , one for journal and one for actual data. Considering you configured journal in the same device , this is what you end up seeing if you are monitoring the device BW. Thanks & Regards Somnath From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com<mailto:ceph-users-boun...@lists.ceph.com>] On Behalf Of gjprabu Sent: Friday, June 05, 2015 3:07 AM To: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> Cc: Kamala Subramani; Siva Sokkumuthu Subject: [ceph-users] Ceph OSD with OCFS2 Dear Team, We are newly using ceph with two OSD and two clients. Both clients are mounted with OCFS2 file system. Here suppose i transfer 500MB of data in the client its showing double of the size 1GB after finish data transfer. Is the behavior is correct or is there any solution for this. Regards Prabu ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. 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