Doubt Bug 121401 - LTCTest: Build36: Takes time to list "Device path" for logical pool creation
Hi Team, i was debugging this bug and found that this query is taking so much time: pvs = subprocess.Popen( ["pvs", "--unbuffered", "--nameprefixes", "--noheadings", "-o", "vg_name", devNodePath], devNodePath is a partition or a disk (e.g. /dev/sdc or /dev/mpathe1) The goal in this command is search the volume group that this partition belongs to. On machines that has inconsistent volume groups, it takes a long time to retrieve the information. Can i cache this information before querying all partitions? Or there is other way to query this info faster? -- Ramon Nunes Medeiros Kimchi Developer Software Engineer - Linux Technology Center Brazil IBM Systems & Technology Group Phone : +55 19 2132 7878 ramonn@br.ibm.com
On 05/02/2015 15:54, Ramon Medeiros wrote:
Hi Team,
i was debugging this bug and found that this query is taking so much time:
pvs = subprocess.Popen( ["pvs", "--unbuffered", "--nameprefixes", "--noheadings", "-o", "vg_name", devNodePath],
devNodePath is a partition or a disk (e.g. /dev/sdc or /dev/mpathe1)
The goal in this command is search the volume group that this partition belongs to. On machines that has inconsistent volume groups, it takes a long time to retrieve the information.
Can i cache this information before querying all partitions? Or there is other way to query this info faster?
What do you mean by "cache this information"?
On 02/06/2015 11:32 AM, Aline Manera wrote:
On 05/02/2015 15:54, Ramon Medeiros wrote:
Hi Team,
i was debugging this bug and found that this query is taking so much time:
pvs = subprocess.Popen( ["pvs", "--unbuffered", "--nameprefixes", "--noheadings", "-o", "vg_name", devNodePath],
devNodePath is a partition or a disk (e.g. /dev/sdc or /dev/mpathe1)
The goal in this command is search the volume group that this partition belongs to. On machines that has inconsistent volume groups, it takes a long time to retrieve the information.
Can i cache this information before querying all partitions? Or there is other way to query this info faster?
What do you mean by "cache this information"?
Instead of run the query every time. Do a single query and cache the result.(then we will refresh it periodically)
-- Ramon Nunes Medeiros Kimchi Developer Software Engineer - Linux Technology Center Brazil IBM Systems & Technology Group Phone : +55 19 2132 7878 ramonn@br.ibm.com
participants (2)
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Aline Manera -
Ramon Medeiros