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Operating Systems
Solaris
dd command
Post 100046 by Perderabo on Thursday 23rd of February 2006 08:23:19 AM
02-23-2006
Epilog
OK, so I have a window with glance running to watch the internal operations of my dd command. The top few lines of glance are activity bars showing overall system utilization. For hours, disk usage was at 100%. Then I noticed that it dropped to 0. No disk utilization at all. Did my dd finish? Nope. It is still running. Both of my file pointers froze at exactly 34359738368. I allowed this situation to persist for a hour or so, mostly because I was busy with something else. Then I killed the dd command. I am certain it would have "ran" for another 4 days if I have let it. Or another 4 years. glance said that dd was in I/O wait and that (to me) points the finger towards the driver. If a gigabyte is 2^30, then 34359738368 is exactly 32 GB. That is a larger number than will fit into 32 bits. So the kernel, the driver, and dd are all in 64 bit mode. But apparently, the driver bumped into some other limit. 
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LEARN ABOUT DEBIAN
glance
GLANCE(1) Glance GLANCE(1) NAME
glance - Glance CLI GLANCE COMMAND LINE INTERFACE
Author glance@lists.launchpad.net Date 2012-01-03 Copyright OpenStack LLC Version 2012.1-dev Manual section 1 Manual group cloud computing SYNOPSIS glance <command> [options] [args] COMMANDS help <command> Output help for one of the commands below add Adds a new image to Glance update Updates an image's metadata in Glance delete Deletes an image from Glance index Return brief information about images in Glance details Return detailed information about images in Glance show Show detailed information about an image in Glance clear Removes all images and metadata from Glance MEMBER COMMANDS image-members List members an image is shared with member-images List images shared with a member member-add Grants a member access to an image member-delete Revokes a member's access to an image members-replace Replaces all membership for an image OPTIONS --version show program's version number and exit -h, --help show this help message and exit -v, --verbose Print more verbose output -d, --debug Print more verbose output -H ADDRESS, --host=ADDRESS Address of Glance API host. Default: 0.0.0.0 -p PORT, --port=PORT Port the Glance API host listens on. Default: 9292 -U URL, --url=URL URL of Glance service. This option can be used to specify the hostname, port and protocol (http/https) of the glance server, for example -U https://localhost:9292/v1 Default: None -k, --insecure Explicitly allow glance to perform insecure SSL (https) requests. The server certificate will not be verified against any cer- tificate authorities. This option should be used with caution. -R REGION, --region=REGION When using keystone authentication version 2.0 or later this identifies the region name to use when selecting the service end- point. If no region is specified and only one region is available that region will be used by default. Where more than one region endpoint is available a region must be provided. -A TOKEN, --auth_token=TOKEN Authentication token to use to identify the client to the glance server --limit=LIMIT Page size to use while requesting image metadata --marker=MARKER Image index after which to begin pagination --sort_key=KEY Sort results by this image attribute. --sort_dir=[desc|asc] Sort results in this direction. -f, --force Prevent select actions from requesting user confirmation --dry-run Don't actually execute the command, just print output showing what WOULD happen. --can-share Allow member to further share image. SEE ALSO o OpenStack Glance BUGS o Glance is sourced in Launchpad so you can view current bugs at OpenStack Glance AUTHOR
OpenStack COPYRIGHT
2010-present, OpenStack, LLC. 2012.1.1 March 14, 2013 GLANCE(1)