Re: What is the merit of incremental backup

2016-07-24 Thread Satoshi Hikida
Hi Rajath, Thank you for your reply. But I'm not sure why the not compacted SSTables takes longer repair time. Could you explain the reason more detail? I guess that SSTables which backed up in backups directory will be never repaired so that It must exchange merkle tree and update actual data t

Re: What is the merit of incremental backup

2016-07-15 Thread Rajath Subramanyam
Hi Satoshi, Incremental Backup if set to True, copies SSTables to the backup folder as soon as a SSTable is flushed to disk. Hence these backed up SSTables miss out on the opportunity to go through compaction. Does that explain the longer time ? - Rajath Rajath Subramany

Re: What is the merit of incremental backup

2016-07-15 Thread Satoshi Hikida
Hi Prasenjit Thank you for your reply. However, I doubt that incremental backup can reduce RTO. I think the demerit of incremental backup is to take longer repair time rather than without incremental backup. Because I've compared the repair time of two cases like below. (a) snapshot(10GB, full

Re: What is the merit of incremental backup

2016-07-14 Thread Prasenjit Sarkar
Hi Satoshi You are correct that incremental backups offer you the opportunity to reduce the amount of data you need to transfer offsite. On the recovery path, you need to piece together the full backup and subsequent incremental backups. However, where incremental backups help is with respect to

What is the merit of incremental backup

2016-07-13 Thread Satoshi Hikida
Hi, I want to know the actual advantage of using incremental backup. I've read through the DataStax document and it says the merit of using incremental backup is as follows: - It allows storing backups offsite without transferring entire snapshots - With incremental backups and snapshots, it can