[lustre-devel] Lustre log question(s)
sudheendra.sampath at gmail.com
Thu Jan 28 12:42:19 PST 2021
I am trying to evaluate osd-zfs based MDS and OST deployment on a 2 node
I have the following questions about Lustre log:
1. *Is changelog and llog both the same, in the sense are they
synonymous with each other?*
2. I understand that ZIL is currently not supported in Lustre version
2.12.2. My question is :
1. My understanding is that transactions (in general) need some
logging mechanism for it to work in 'all or none' scenarios. Please
correct me if my understanding is incorrect. I understand that
has to be enabled so that filesystem changes are recorded to be replayed
after a crash. *How does Lustre transactions work if there is no
intent log/changelog ?*
2. Does it mean that if changelog is NOT enabled and there is a
crash, we risk losing all changes/updates to the filesystem ?
Appreciate your timely response and Thank you for your help.
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