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Russell King
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Jan 6, 2011
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--- | ||
refs/heads/master: 36bb94ba36f332de767cfaa3af6a5136435a3a9c | ||
refs/heads/master: 28cdac6690cb113856293bf79b40de33dbd8f974 |
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What: /sys/bus/rbd/ | ||
Date: November 2010 | ||
Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, | ||
Sage Weil <sage@newdream.net> | ||
Description: | ||
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Being used for adding and removing rbd block devices. | ||
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] | ||
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add | ||
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> | ||
will be assigned for any registered block device. If snapshot is used, it will | ||
be mapped read-only. | ||
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Removal of a device: | ||
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$ echo <dev-id> > /sys/bus/rbd/remove | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/ | ||
-------------------------------------------- | ||
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client_id | ||
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The ceph unique client id that was assigned for this specific session. | ||
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major | ||
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The block device major number. | ||
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name | ||
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The name of the rbd image. | ||
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pool | ||
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The pool where this rbd image resides. The pool-name pair is unique | ||
per rados system. | ||
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size | ||
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The size (in bytes) of the mapped block device. | ||
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refresh | ||
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Writing to this file will reread the image header data and set | ||
all relevant datastructures accordingly. | ||
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current_snap | ||
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The current snapshot for which the device is mapped. | ||
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create_snap | ||
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Create a snapshot: | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create | ||
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rollback_snap | ||
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Rolls back data to the specified snapshot. This goes over the entire | ||
list of rados blocks and sends a rollback command to each. | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback | ||
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snap_* | ||
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A directory per each snapshot | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> | ||
------------------------------------------------------------- | ||
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id | ||
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The rados internal snapshot id assigned for this snapshot | ||
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size | ||
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The size of the image when this snapshot was taken. | ||
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What: /sys/devices/platform/eeepc-wmi/cpufv | ||
Date: Oct 2010 | ||
KernelVersion: 2.6.37 | ||
Contact: "Corentin Chary" <corentincj@iksaif.net> | ||
Description: | ||
Change CPU clock configuration (write-only). | ||
There are three available clock configuration: | ||
* 0 -> Super Performance Mode | ||
* 1 -> High Performance Mode | ||
* 2 -> Power Saving Mode |
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Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE) | ||
--------------------------------------------------------------------- | ||
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ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommeds | ||
moving to the load-locked/store-conditional instructions LDREX and STREX. | ||
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ARMv7 multiprocessing extensions introduce the ability to disable these | ||
instructions, triggering an undefined instruction exception when executed. | ||
Trapped instructions are emulated using an LDREX/STREX or LDREXB/STREXB | ||
sequence. If a memory access fault (an abort) occurs, a segmentation fault is | ||
signalled to the triggering process. | ||
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/proc/cpu/swp_emulation holds some statistics/information, including the PID of | ||
the last process to trigger the emulation to be invocated. For example: | ||
--- | ||
Emulated SWP: 12 | ||
Emulated SWPB: 0 | ||
Aborted SWP{B}: 1 | ||
Last process: 314 | ||
--- | ||
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NOTE: when accessing uncached shared regions, LDREX/STREX rely on an external | ||
transaction monitoring block called a global monitor to maintain update | ||
atomicity. If your system does not implement a global monitor, this option can | ||
cause programs that perform SWP operations to uncached memory to deadlock, as | ||
the STREX operation will always fail. | ||
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