[OpenAFS] forcing and benchmarking the cache scan
Edgecombe, Jason
jwedgeco@uncc.edu
Fri, 18 Mar 2011 10:05:14 -0400
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Hi everyone,
=20
I had a server doing a cache scan for over an hour yesterday after
upgrading the RAID (mpt2sas) driver on RHEL5.5 64bit. I thought the box
hung, so I ran a hard reset and ended up rebuilding it. I'm trying to
reproduce and measure the cache scan time with the two different
versions of the RAID driver to see if the driver causes an issue, or
not. How can I force the client to run a cache scan when I run
/etc/init.d/openafs-client restart instead of at boot time?
=20
I'm trying the following procedure to benchmark things:
=20
fs setcachesize 1
fs setcachesize 62048980
fs getcachep
cd /afs/(some folder)
find . -type f | xargs cat > /dev/null
cd /
time /etc/init.d/openafs-client restart
=20
Details on production box:
OS: RedHat Enterprise Linux Server 5.5 (64bit)
Hardware: Dell PowerEdge R210 With H200 RAID controller
Driver: mp2tsas driver from Dell
=20
Details on testing box (my only H200 cards are in production servers):
OS: RedHat Enterprise Linux Server 5.5 (64bit)
Hardware: Dell PowerEdge R510 With H700 RAID controller
Driver: mp2tsas driver from Dell
=20
Thanks,
Jason
=20
------------------------------------------------------------------------
---
Jason Edgecombe | Linux and Solaris Administrator
UNC Charlotte | The William States Lee College of Engineering
9201 University City Blvd. | Charlotte, NC 28223-0001
jwedgeco@uncc.edu <mailto:jwedgeco@uncc.edu> | http://coe.uncc.edu
<http://coe.uncc.edu/> | <https://www.facebook.com/UNCCEngr> =20
Facebook <https://www.facebook.com/UNCCEngr>=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'>I had a server doing =
a cache scan for over an hour yesterday after upgrading the RAID =
(mpt2sas) driver on RHEL5.5 64bit. I thought the box hung, so I ran a =
hard reset and ended up rebuilding it. I’m trying to reproduce and =
measure the cache scan time with the two different versions of the RAID =
driver to see if the driver causes an issue, or not. How can I force the =
client to run a cache scan when I run /etc/init.d/openafs-client restart =
instead of at boot time?<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'>I’m trying the =
following procedure to benchmark things:<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 style=3D'margin-left:.5in'><span =
style=3D'font-size:10.0pt'>fs setcachesize 1<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:.5in'><span =
style=3D'font-size:10.0pt'>fs setcachesize =
62048980<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:.5in'><span style=3D'font-size:10.0pt'>fs =
getcachep<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:.5in'><span style=3D'font-size:10.0pt'>cd =
/afs/(some folder)<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:.5in'><span style=3D'font-size:10.0pt'>find . -type =
f | xargs cat > /dev/null<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:.5in'><span style=3D'font-size:10.0pt'>cd =
/<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:.5in'><span style=3D'font-size:10.0pt'>time =
/etc/init.d/openafs-client restart<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'>Details on production =
box:<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>OS: RedHat Enterprise Linux Server 5.5 =
(64bit)<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Hardware: Dell PowerEdge R210 With H200 RAID =
controller<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Driver: mp2tsas driver from =
Dell<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'>Details on testing =
box (my only H200 cards are in production =
servers):<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>OS: RedHat Enterprise Linux Server 5.5 =
(64bit)<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Hardware: Dell PowerEdge R510 With H700 RAID =
controller<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Driver: mp2tsas driver from =
Dell<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"'><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> | </span><a =
href=3D"https://www.facebook.com/UNCCEngr"><span =
style=3D'color:gray;text-decoration:none'><img border=3D0 width=3D16 =
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alt=3Dfacebook-logo></span></a><span style=3D'color:gray'> <a =
href=3D"https://www.facebook.com/UNCCEngr"><span =
style=3D'color:gray'>Facebook</span></a></span><span =
style=3D'font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></s=
pan></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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