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Posted to users@httpd.apache.org by si...@allumezinfotech.com on 2009/03/12 15:45:47 UTC
[users@httpd] Enable Send file - SAN
I understand when u enable send file in apache it uses "zero - copy "
mechanism of OS but as per apache docs this will not work on NAS or SMB.
What about SAN ? I tried and it gave wiered behaviour like only html's got
served when i enabled it and no image. moment i put doc root on local
apache started serving images with enabel send file on.
Pls suggest.
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Re: [users@httpd] Enable Send file - SAN
Posted by si...@allumezinfotech.com.
- It is a EMC storage which is shared.
- If i turn off sendfile it works on SAN.
> On 12.03.09 13:00, singh@allumezinfotech.com wrote:
>> File system is : vxfs .. this is veritas file system for san.
>
> commercial version? Do you mount that from more than one machine, e.g. use
> any form of clustering?
>
>> i will chk more on enable send file thing then
>
> the problem with sendfile on network filesystems is afaik that kernel may
> not
> notice if other machine has changed the file so crap may get send to the
> client.
>
> Turn off sendfile and try if it works. That may be a problem of vxfs
> too...
> --
> Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
> On the other hand, you have different fingers.
>
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Re: [users@httpd] Enable Send file - SAN
Posted by Matus UHLAR - fantomas <uh...@fantomas.sk>.
On 12.03.09 13:00, singh@allumezinfotech.com wrote:
> File system is : vxfs .. this is veritas file system for san.
commercial version? Do you mount that from more than one machine, e.g. use
any form of clustering?
> i will chk more on enable send file thing then
the problem with sendfile on network filesystems is afaik that kernel may not
notice if other machine has changed the file so crap may get send to the
client.
Turn off sendfile and try if it works. That may be a problem of vxfs too...
--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
On the other hand, you have different fingers.
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Re: [users@httpd] Enable Send file - SAN
Posted by si...@allumezinfotech.com.
File system is : vxfs .. this is veritas file system for san.
i will chk more on enable send file thing then
> On 12.03.09 10:29, singh@allumezinfotech.com wrote:
>> We have a server 64 bit Linux and SAN is connected to this box locally.
>
> What filesystem?
>
>> Amazing thing is if i enable send file then ONLY images got broken and
>> not
>> html files. I am sure apache treats images in seperate way then htmls
>> but
>> i dont have vision far from that ..
>
> Apache usually doesn't "treat images in separate way" unless you tell it
> to,
> e.g. parse it with any module that may change the content (includes, php,
> charset_lite etc).
>
> If anything gets broken with EnableSendFile turned on, but works when it's
> turned off, then it's apparently a problem of EnableSendFile.
>
> --
> Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
> A day without sunshine is like, night.
>
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Re: [users@httpd] Enable Send file - SAN
Posted by Matus UHLAR - fantomas <uh...@fantomas.sk>.
On 12.03.09 10:29, singh@allumezinfotech.com wrote:
> We have a server 64 bit Linux and SAN is connected to this box locally.
What filesystem?
> Amazing thing is if i enable send file then ONLY images got broken and not
> html files. I am sure apache treats images in seperate way then htmls but
> i dont have vision far from that ..
Apache usually doesn't "treat images in separate way" unless you tell it to,
e.g. parse it with any module that may change the content (includes, php,
charset_lite etc).
If anything gets broken with EnableSendFile turned on, but works when it's
turned off, then it's apparently a problem of EnableSendFile.
--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
A day without sunshine is like, night.
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Re: [users@httpd] Enable Send file - SAN
Posted by si...@allumezinfotech.com.
Thanks for the reply ,
We have a server 64 bit Linux and SAN is connected to this box locally.
Amazing thing is if i enable send file then ONLY images got broken and not
html files. I am sure apache treats images in seperate way then htmls but
i dont have vision far from that ..
And if use fiddler then i can see repose 200 for images but they never
apear so it feels like apache deleivers it but some where os dont to NIc..
any pointers ?
> On 12.03.09 08:45, singh@allumezinfotech.com wrote:
>> I understand when u enable send file in apache it uses "zero - copy "
>> mechanism of OS but as per apache docs this will not work on NAS or SMB.
>
> I think it's "NFS or SMB". It should work for NAS, if that's connected to
> your computer and local filesystem runs on it. The problem appears for
> storages maintained by other system and accessed by network file sharing
> protocols.
>
>> What about SAN ? I tried and it gave wiered behaviour like only html's
>> got
>> served when i enabled it and no image. moment i put doc root on local
>> apache started serving images with enabel send file on.
>
> I think I explained above
> --
> Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
> Saving Private Ryan...
> Private Ryan exists. Overwrite? (Y/N)
>
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>
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Re: [users@httpd] Enable Send file - SAN
Posted by Matus UHLAR - fantomas <uh...@fantomas.sk>.
On 12.03.09 08:45, singh@allumezinfotech.com wrote:
> I understand when u enable send file in apache it uses "zero - copy "
> mechanism of OS but as per apache docs this will not work on NAS or SMB.
I think it's "NFS or SMB". It should work for NAS, if that's connected to
your computer and local filesystem runs on it. The problem appears for
storages maintained by other system and accessed by network file sharing
protocols.
> What about SAN ? I tried and it gave wiered behaviour like only html's got
> served when i enabled it and no image. moment i put doc root on local
> apache started serving images with enabel send file on.
I think I explained above
--
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Saving Private Ryan...
Private Ryan exists. Overwrite? (Y/N)
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