[OpenAFS] Openafs 1.4.2 on Debian Etch kernel 2.6.18 slow

Sat, 10 Feb 2007 14:53:24 -0500

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I'm attempting to deploy/update a new AFS fileserver.  The new server  
is the first to upgraded from Debian sarge, OpenAFS 1.3.xx, kernel  
2.4 to Etch, 2.6.18, AFS 1.4.2, reiserfs and a new 7 terabyte XRaid.

The upgrade went fine except I file writes to the new system are so  
slow the system is unusable.  On the server iostat shows a transfer  
rate of ~40KB/s and an iowait of 20 during AFS operations.  If I stop  
the fileserver and perform io directly on the XRaid I can read and  
write between 100MB/s-500MB/s.

Does anyone have any suggestions on how I might trouble shoot this  
problem?  So far I've checked network performance, io performance  
directly to the XRaid, and the reisfer filesystem.  It all seems to  
be pointing me back to the some problem is the AFS fileserver.

Hardware:
HP DL380
2x2.8ghz Hyperthreaded Xeon CPU
4 Gigs of RAM
Gigabit ethernet
MPTFusion fiber channel card
Apple XRaid

I've got 2 other identical box currently run AFS and working fine.   
The only difference is the other boxes are running an old OS.

Derek Harkness
System Administrator
University of Michigan-Dearborn
(313) 593-5089

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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; ">I'm attempting to deploy/update =
a new AFS fileserver.=A0 The new server is the first to upgraded from =
Debian sarge, OpenAFS 1.3.xx, kernel 2.4 to Etch, 2.6.18, AFS 1.4.2, =
reiserfs and a new 7 terabyte XRaid.<DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>The upgrade went fine =
except I file writes to the new system are so slow the system is =
unusable.=A0 On the server iostat shows a transfer rate of ~40KB/s and =
an iowait of 20 during AFS operations.=A0 If I stop the fileserver and =
perform io directly on the XRaid I can read and write between =
100MB/s-500MB/s.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Does anyone have any =
suggestions on how I might trouble shoot this problem?=A0 So far I've =
checked network performance, io performance directly to the XRaid, and =
the reisfer filesystem.=A0 It all seems to be pointing me back to the =
some problem is the AFS fileserver.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Hardware:</DIV><DIV>HP =
DL380=A0</DIV><DIV>2x2.8ghz Hyperthreaded Xeon CPU</DIV><DIV>4 Gigs of =
RAM</DIV><DIV>Gigabit ethernet</DIV><DIV>MPTFusion fiber channel =
card</DIV><DIV>Apple XRaid</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>I've got 2 other identical =
box currently run AFS and working fine.=A0 The only difference is the =
other boxes are running an old OS.<BR><DIV> <SPAN =
class=3D"Apple-style-span" style=3D"border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: auto; =
-khtml-text-decorations-in-effect: none; text-indent: 0px; =
-apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Derek =
Harkness</DIV><DIV>System Administrator</DIV><DIV>University of =
Michigan-Dearborn</DIV><DIV>(313) 593-5089</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><BR =
class=3D"Apple-interchange-newline"></SPAN> =
</DIV><BR></DIV></BODY></HTML>=

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