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28 Posts
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1329
February 16th, 2016 12:00
RP with XtremIO-Question on snapshot pruning policy and snap promotion
Hello,
I have a few questions on recoverpoint replication with XtremIO:
1. Whitepaper "RecoverPoint Replication of XtremIO" suggests user bookmarks are deleted only when they reach 80% percent of the overall snapshot count. Does that mean the manual bookmarks are not deleted even when they exceed the Requested Protection Window period?
2. I am trying to understand the rationale behind the snap promotion every 30min on the target copy. Besides performing a snap promotion during image access, why it has to be done every 30 min?
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Idan
675 Posts
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February 17th, 2016 04:00
Hi,
1. Yes, user created bookmarks would be deleted by the pruning mechanism only when there're 80% or more user bookmarks (100% is all the PiTs)
2. The reason this promotion is not performed all the time is to ease on array based operations.
Hope that helps,
Idan Kentor
RecoverPoint Corporate Systems Engineering
echolaughmk
2 Intern
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522 Posts
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February 17th, 2016 04:00
Hi,
From a previous inquiry on the same topics, here is what I uncovered if I am correct:
1. Manual bookmarks are deleted per the pruning policy from what I have seen. I believe this is suggesting that they will only be deleted when their consumption of snapshots reached the 80% capacity, so in normal replication, they will eventually trail off, but I believe they hang around longer than the automated ones. I could be incorrect on this, but the CSE's will chime in I'm guessing.
2. I believe this is just for management overhead. When you enable an image, it will do the promotion at that time, however if you have a periodic interval running every minute, it is unlikely you will need the snap promotion after each one, so just to keep the overhead low, they only automatically do it every 30 minutes. I equate it to just managing the overhead and tasks efficiently and nothing much more than that from what I have investigated.
The guys will check me on #1, but otherwise I hope this helps.
-Keith
Cherry251
28 Posts
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February 17th, 2016 06:00
Idan,
Could you please clarify on my first question. Let's say I set the Requested Protection Window to 2 days. I took a manual bookmark today and let's say this is the only manual bookmark created. According to pruning policy, this bookmark will not be deleted as there are no 80%of user bookmarks. What I would like to know is will this bookmark be available on the third day from today.
Idan
675 Posts
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February 23rd, 2016 12:00
Hi,
If there are less than 80% of user bookmarks, user bookmarks will be removed in accordance with required protection window. So, in your example, the bookmark would be deleted after 2 days (required PW) since it has priority over other PiTs.
Regards,
Idan