sync_dirty_timeout_secs
On DVS servers, specifies the number of seconds that must have passed since
the file was written before DVS syncs it. The objective is to reduce unnecessary
sync operations for files actively being updated. Decreasing this number increases
the likelihood that the file is in use when it is synced. Increasing this number
increases the likelihood that processes are killed during a server failure.
On DVS clients, specifies the number of seconds that must have passed since the
file was written before DVS asks the server for an updated sync time. Decreasing
this number increases the number of DVS requests being sent. Increasing this
number increases the likelihood that processes are killed during a server failure.
This parameter is part of the periodic sync feature.
●
Default value: 300 (servers and clients)
●
To view read-only:
cat
/sys/module/dvs/parameters/sync_dirty_timeout_secs
●
To change prior to boot, add these lines to
<nid_of_choice>
/etc/modprobe.d/dvs-local.conf
:
# Set the timeout (seconds) for syncing
# dirty files on a DVS server or client
options dvs sync_dirty_timeout_secs=300
●
To change dynamically:
hostname#
echo 300 > /proc/fs/dvs/sync_dirty_timeout_secs
sync_num_threads
Specifies the number of threads on the DVS server that perform sync operations.
The number of threads must be a minimum of 1 thread and a maximum of 32.
Note that it can take up to
sync_period_secs
for changes to this value to take
effect.
This parameter is part of the periodic sync feature.
●
Default value: 8
●
To view read-only:
cat
/sys/module/dvs/parameters/sync_num_threads
●
To change prior to boot, add these lines to
<nid_of_choice>
/etc/modprobe.d/dvs-local.conf
:
# Set the number of threads that perform
# sync operations on a DVS server
options dvs sync_num_threads=8
●
To change dynamically:
hostname#
echo 8 > /proc/fs/dvs/sync_num_threads
sync_period_secs
On DVS servers, specifies the number of seconds before the
sync_num_threads
syncs files on the DVS server (if necessary).
Cray DVS
S3016
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