[OpenAFS] Reducing cache scan time
Edgecombe, Jason
jwedgeco@uncc.edu
Wed, 26 Jan 2011 15:58:30 -0500
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Hi everyone,
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As disk sizes increase, we are increasing the size of our AFS disk
caches. We have many that are 64GB or larger. Unfortunately, the cache
scan is taking more than 5 minutes when booting or starting AFS. Is
there some way to decrease this time it takes to scan the cache?
=20
Is there a setting I can tweak that might make a difference?
=20
Is it a problem that I have 913 DXXX folders in the cache folder, and
each has 2048 files in the folder?
=20
My afsd options are "-fakestat -dynroot -chunksize 18 -stat 500000
-daemons 16 -volumes 2000 -blocks 59535014 . I dynamically add the block
option based on the size of the cache partition.
=20
Thanks,
Jason
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------------------------------------------------------------------------
---
Jason Edgecombe | Linux and Solaris Administrator
UNC Charlotte | The William States Lee College of Engineering
9201 University City Blvd. | Charlotte, NC 28223-0001
Phone: 704-687-3514
jwedgeco@uncc.edu <mailto:jwedgeco@uncc.edu> | http://coe.uncc.edu
<http://coe.uncc.edu/>=20
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Hi everyone,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>As disk sizes =
increase, we are increasing the size of our AFS disk caches. We =
have many that are 64GB or larger. Unfortunately, the cache scan is =
taking more than 5 minutes when booting or starting AFS. Is there some =
way to decrease this time it takes to scan the =
cache?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>Is there a setting I =
can tweak that might make a difference?<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>Is it a problem that =
I have 913 DXXX folders in the cache folder, and each has 2048 files in =
the folder?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>My afsd options are =
“-fakestat -dynroot -chunksize 18 -stat 500000 -daemons 16 =
-volumes 2000 -blocks 59535014 . I dynamically add the block option =
based on the size of the cache partition.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Jason<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>--------------=
-------------------------------------------------------------<o:p></o:p><=
/span></p><p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>Jason =
Edgecombe <b>| </b>Linux and Solaris =
Administrator<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>UNC Charlotte =
<b>| </b>The William States Lee College of =
Engineering<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>9201 =
University City Blvd. <b>| </b>Charlotte, NC =
28223-0001<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>Phone: =
704-687-3514<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'><a =
href=3D"mailto:jwedgeco@uncc.edu"><span =
style=3D'color:windowtext'>jwedgeco@uncc.edu</span></a> <b>| </b><a =
href=3D"http://coe.uncc.edu/"><span =
style=3D'color:blue'>http://coe.uncc.edu</span></a><o:p></o:p></span></p>=
<p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'>--------------=
-------------------------------------------------------------<o:p></o:p><=
/span></p><p class=3DMsoNormal style=3D'text-autospace:none'><span =
style=3D'font-size:8.0pt;font-family:"Arial","sans-serif"'>If you are =
not the intended recipient of this transmission or a person responsible =
for delivering it to the intended recipient, any disclosure, copying, =
distribution, or other use of any of the information in this =
transmission is strictly prohibited. If you have received this =
transmission in error, please notify me immediately by reply e-mail or =
by telephone at 704-687-3514. Thank you.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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