X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=LustreRecovery.xml;h=b30a519746570a9476a0fb622fda0799daf3b123;hb=0d00163cf18fdd3b6c4be141ac1f878ef48afb1e;hp=461a14207e057170c9f1175a2f5c7fc7bbd14a46;hpb=cae9d68f27099e785d48e0fc5162e92dbc86364c;p=doc%2Fmanual.git diff --git a/LustreRecovery.xml b/LustreRecovery.xml index 461a142..b30a519 100644 --- a/LustreRecovery.xml +++ b/LustreRecovery.xml @@ -1,69 +1,8 @@ -
+ Lustre Recovery - - - - - - - - - Lustre 2.0 Operations Manual - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C H A P T E R  30 - - - - - - - - - - - Lustre Recovery - - - - This chapter describes how recovery is implemented in Lustre and includes the following sections: Recovery Overview @@ -368,7 +307,7 @@ In pre-VBR versions of Lustre, if the MGS or an OST went down and then recovered, a recovery process was triggered in which clients attempted to replay their requests. Clients were only allowed to replay RPCs in serial order. If a particular client could not replay its requests, then those requests were lost as well as the requests of clients later in the sequence. The ''downstream'' clients never got to replay their requests because of the wait on the earlier client’s RPCs. Eventually, the recovery period would time out (so the component could accept new requests), leaving some number of clients evicted and their requests and data lost. With VBR, the recovery mechanism does not result in the loss of clients or their data, because changes in inode versions are tracked, and more clients are able to reintegrate into the cluster. With VBR, inode tracking looks like this: - Each inode[2] stores a version, that is, the number of the last transaction (transno) in which the inode was changed. + Each inodeUsually, there are two inodes, a parent and a child. stores a version, that is, the number of the last transaction (transno) in which the inode was changed. @@ -474,59 +413,7 @@ -   - - 2(Footnote)Usually, there are two inodes, a parent and a child. - - - - - - - - - - - - - Lustre 2.0 Operations Manual - 821-2076-10 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Copyright © 2011, Oracle and/or its affiliates. All rights reserved. -
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