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...Operations Manual''] including information about features such as metadata replay and reply reconstruction.

|'''Replay'''||A client resends a transaction that had previously been executed and fo ...n controlled replay'''||clients connecting at any time and are allowed to replay updates to anything that did not change since the update was made before th

...we would need in most cases, but in some cases the DMU might have to read metadata from disk before being able to handle the request, in which case more threa Replies are sent to the clients with transaction numbers etc as we do for metadata

...allowing clients to recover in less strict order and even allow client to replay request long after main recovery is completed. Independent changes should b ...'': existing recovery where all dependencies are tracked using transno and replay is done in order of transno

== Clustering Metadata == ...r to provide enhanced scalability and performance, Lustre offers clustered metadata servers. This section will give an outline of the architecture.

Changelogs record events that change the filesystem namespace or file metadata. Events such as file creation, deletion, renaming, attribute changes, etc. ...actions. With no dependent, uncommitted transactions to apply, the clients replay their requests independently without the risk of being evicted.

# follow same recovery model (atomic updates, executed-once semantics, replay changes from clients) |colspan=2|'''Business Goals:''' || preserve correct data in case of partial replay

A '''changelog''' is a log of data or metadata changes. In general, these will track filesystem operations conveyed via o |reintegration||consistency||replay changelogs from caches and proxies to reintegrate changes back to master se

|Replay Signatures ...by digitally signing it at processing time and verifying the signature at replay time.</small>

:Verifies RPC replay after a communications failure (message loss). :Distributed Metadata Update Test to verify that distributed metadata updates are properly completed when multiple clients create/delete files an

ldlm_inodebits.c - Inodebis locks used for metadata locking namei.c - Metadata operations code.

; I/O request : This term groups read requests, write requests and other metadata accesses like truncate or unlink. ...has been removed by Lustre after being copied to the HSM. The MDT retains metadata info for the file.

When a connection is made to a Lustre metadata server the key question that arises is: ==== Replay of open after recovery ====

...ructures for all the metadata operations that result in update of the file metadata on the MDS. The structure of the update record will depend on the operation |16 || cr_replayfid || fid of parent used to replay request.

Description: replay-single test_61d: LustreError: 17392:0:(lprocfs_status.c:859:lprocfs_obd_cle ...llog cat under semphore which can be blocked on reconnect and break normal replay, fix access to wrong pointer.

The async journal commit feature (bug 19128) and the cancel lock before replay feature (bug 16774) are disabled by default. Description: replay-dual: ldlm_lock.c:1622:ldlm_lock_cancel()) LBUG type: PLN<br>