Lustre 1.6 Operations Manual

GSS
Group Sweeping Scheduling. A disk sched uling strategy in which requests are
served in cycles, in a round-robin manner.
I
Import
Intent Lock
IOV
The state held by a client to fully recover a transaction sequence after a server
failure and restart.
A special locking operation introduced by Lustre into the Linux kernel. An
intent lock combines a request for a lock, with the full information to perform
the operation(s) for which the lock was requested. This offers the server the
option of granting the lock or performing the operation and informing the
client of the operation result without granting a lock. The use of intent locks
enables metadata operations (even complicated ones), to be implemented with
a single RPC from the client to the server.
I/O vector. A buffer destined for transport across the network which contains a
collection (a/k/a as a vector) of blocks with data.
J
Join File
K
Kerberos
An authentication mechanism, optionally available in Lustre 1.8 as a GSS
backend.
L
LAID
LBUG
Lustre RAID. A mechanism whereby the LOV stripes I/O over a number of
OSTs with redundancy. This functionality is expected to be introduced in
Lustre 2.0.
A bug that Lustre writes into a log indicating a serious system failure.
Glossary-4 Lustre 1.6 Operations Manual • September 2008