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тАО10-05-2009 12:53 PM
тАО10-05-2009 12:53 PM
Re: NFS data corruption issue 11.31 Itanium
It seems to take even more time if you do a "ll
All of our 11.31 servers have the same configuration as far as number of CPU's, memory, and OS patch level, with the exception of the ONC version.
Another question I have, the ONC version never cropped up when I ran a patch analysis on HP's ITRC website. Should ONC patches be covered as part of the normal patch bundle, or do I need to periodically check the web URL for the ONC package to see if there are updates and apply those instead?
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тАО10-06-2009 06:11 AM
тАО10-06-2009 06:11 AM
Re: NFS data corruption issue 11.31 Itanium
This is a new ONC version, not a patch, so it doesn't show up with a patch analysis. (Similar to new compiler versions.)
>do I need to periodically check the web URL for the ONC package to see if there are updates and apply those instead?
Yes, for now. I don't know if Bob has plans for swa and non-patches.
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тАО10-06-2009 08:58 AM
тАО10-06-2009 08:58 AM
Re: NFS data corruption issue 11.31 Itanium
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тАО10-07-2009 02:19 PM
тАО10-07-2009 02:19 PM
Re: NFS data corruption issue 11.31 Itanium
I mounted the filesystem using default options:
# nfsstat -m
/netapp-1 from atcfiler1:/vol/vol1
Flags: vers=3,proto=tcp,sec=sys,hard,intr,link,symlink,acl,devs,rsize=32768,wsize=32768,retrans=5,timeo=600
Attr cache: acregmin=3,acregmax=60,acdirmin=30,acdirmax=60
I then timed how long it takes to use "ll" in each of these directory structures:
# timex ll -R 1000dirs | wc -l
real 1.48
user 0.25
sys 0.58
27107
# timex ll -R 27000dirs | wc -l
real 1.44
user 0.26
sys 0.41
27001
In both cases it only took 1.4 seconds to complete the operation. I'm not displaying the contents, merely passing the results to "wc -l" so there is no lag time waiting to display all 27,000 files on my screen.
So I agree, 60 seconds sounds like a long time to return 27,000 directory entries, but in my tests I'm getting very good response times so this doesn't appear to be a class problem with all 11.31 systems.
As for NFS v4, yes it is available on 11.31 systems. You can certainly try it and see if it provides better performance. I tried it on my systems and here are the numbers I got with NFS v4:
# timex ll -R 1000dirs | wc -l
real 15.76
user 0.25
sys 4.91
27107
# timex ll -R 27000dirs | wc -l
real 27.48
user 0.27
sys 0.66
27001
Looks like things take a lot longer with NFS v4 on my systems. Your mileage may vary.
Regards,
Dave
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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тАО10-07-2009 02:27 PM
тАО10-07-2009 02:27 PM
Re: NFS data corruption issue 11.31 Itanium
/gp05 from tec-storage2.tec.clinitech.net:/vol/ops/gp01
Flags: vers=3,proto=tcp,sec=sys,hard,intr,link,symlink,acl,devs,rsize=32768,wsize=32768,retrans=5,timeo=600
Attr cache: acregmin=3,acregmax=60,acdirmin=30,acdirmax=60
timex ll | wc -l
real 1:12.72
user 0.27
sys 0.34
28177
Also, I'm seeing this message in the syslog every once in a while...
Synchronous Page I/O error occurred while paging to/from NFS server tec-storage2.tec.clinitech.net
file system is /gp05
What could this error indicate? What sorts of things should I check?
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тАО10-07-2009 02:43 PM
тАО10-07-2009 02:43 PM
Re: NFS data corruption issue 11.31 Itanium
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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тАО02-23-2010 06:22 AM
тАО02-23-2010 06:22 AM
Re: NFS data corruption issue 11.31 Itanium
I also have an RX6600 server with HPUX 11.31 and i am also facing the NFS performance issue and the call is with HP since December 2009 and HP has still not been able to resolve it.
Thanks.
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тАО02-24-2010 04:10 PM
тАО02-24-2010 04:10 PM
Re: NFS data corruption issue 11.31 Itanium
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тАО02-24-2010 04:33 PM
тАО02-24-2010 04:33 PM
Re: NFS data corruption issue 11.31 Itanium
An interesting test for your long "ll" times would be to mount the filesystem with the "readdir" option:
readdir Disable the READDIRPLUS functionality, which is
used by default on an NFS Version 3 mount point,
and use the NFS Version 2 READDIR functionality
instead. The performance of applications that
read huge directories over NFS will vary between
NFS Version 2 and NFS Version 3 depending on the
type of information that the applications need.
The find command will be faster using NFS Version
3 READDIRPLUS while the ls command will be faster
using NFS Version 2 READDIR. The readdir option
must be used on a case by case basis depending
upon the application. There is no effect on an
NFS Version 2 mount point.
If you can, give that a try and see if the ll times change for the better.
Regards,
Dave
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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тАО03-04-2010 01:58 AM
тАО03-04-2010 01:58 AM
Re: NFS data corruption issue 11.31 Itanium
Thanks for your reply.
My problem was resolved by using the following
I exported the filesystem on the NFS server with the ASYNC option.
On the NFS client i set the ketnel parameter nfs_enable_write_behind=1
and mounted the filesystem on the client side using the forcedirectio option.
I short i used the ASUNC mode on both the Server and the Client.
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