[ceph-users] Garbage Collection on Luminous

Hi, I have a production cluster and it is experiencing lot of DELETES since many months. However, with the default gc configs - I did not see the cluster space utilization going down. Moreover, the gc list has more than 4 million objects. I tried increasing the gc configs on 4 rados gateways and fired manual gc using the command: *sudo radosgw-admin gc process* The changed GC configs are as follows: rgw gc max objs = 100 rgw gc obj min wait = 3600 rgw gc processor max time = 900 rgw gc processor period = 3600 rgw gc max concurrent io = 20 rgw gc max trim chunk = 64 *Questions* 1. Since the cluster is active cluster and having both PUT and DELETE requests - I am unable to determine whether manual GC is indeed helping. I did see an increase in free space one day - but from the past few days I do not see any increase in free space. How do I determine whether GC is really running? *sudo radosgw-admin gc list | grep oid | wc -l * This command the list is always increasing and I do see very old objects when I grep for oid. 2. Does GC have some problems running automatically on Luminous? It is enabled. 3. Are the above configs fine or can they be made more aggressive? 4. Is there a faster way to claim space which is pending GC without impacting much performance? Thanks and Regards, Priya -- *-----------------------------------------------------------------------------------------* *This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error, please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee, you should not disseminate, distribute or copy this email. Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.*****  **** *Any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the organization. Any information on shares, debentures or similar instruments, recommended product pricing, valuations and the like are for information purposes only. It is not meant to be an instruction or recommendation, as the case may be, to buy or to sell securities, products, services nor an offer to buy or sell securities, products or services unless specifically stated to be so on behalf of the Flipkart group. Employees of the Flipkart group of companies are expressly required not to make defamatory statements and not to infringe or authorise any infringement of copyright or any other legal right by email communications. Any such communication is contrary to organizational policy and outside the scope of the employment of the individual concerned. The organization will not accept any liability in respect of such communication, and the employee responsible will be personally liable for any damages or other liability arising.*****  **** *Our organization accepts no liability for the content of this email, or for the consequences of any actions taken on the basis of the information *provided,* unless that information is subsequently confirmed in writing. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.* _-----------------------------------------------------------------------------------------_