Can we make char files not blocked for the volumes
Can lvm create char devices not blocked for the volumes?
Did a listing in the volume group dir. Note the char device file (group). How can we make the other files / volumes the same. Informix wants char devices not blocked. I seem to note that linux does not really treat them different but...
$ ls -l
crw-r----- 1 root root 109, 0 Jan 29 18:46 group brw-rw---- 1 informix informix 58, 1 Jan 29 19:10 infx_data1 brw-rw---- 1 informix informix 58, 0 Jan 29 19:09 infx_root
Thanks,
Chris Anderson
[email protected]
Please have a look at the rawio support for Linux.
This enables you to create raw devices for every block device in the system including the LVM ones.
Heinz
Quoted 9 lines
Can lvm create char devices not blocked for the volumes?
Did a listing in the volume group dir. Note the char device file (group). How can we make the other files / volumes the same. Informix wants char devices not blocked. I seem to note that linux does not really treat them different but...
$ ls -l
Quoted 9 lines
crw-r----- 1 root root 109, 0 Jan 29 18:46 group brw-rw---- 1 informix informix 58, 1 Jan 29 19:10 infx_data1 brw-rw---- 1 informix informix 58, 0 Jan 29 19:09 infx_rootThanks,
Chris Anderson
[email protected]
Content-Description: S/MIME Cryptographic Signature
[Attachment, skipping...]
Signature · 11 lines
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Systemmanagement CS-TS T-Nova
Entwicklungszentrum Darmstadt
Heinz Mauelshagen Otto-Roehm-Strasse 71c
Senior Systems Engineer Postfach 10 05 41
64205 Darmstadt
[email protected] Germany
+49 6151 886-425
FAX-386
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-Quoted 1 line · Heinz Mauelshagen
Please have a look at the rawio support for Linux.
Where can I find this? In the kernel? Any help would be great.
Quoted 41 lines
This enables you to create raw devices for every block device in the system including the LVM ones.
Heinz
Quoted 9 lines
Can lvm create char devices not blocked for the volumes?
Did a listing in the volume group dir. Note the char device file (group). How can we make the other files / volumes the same. Informix wants char devices not blocked. I seem to note that linux does not really treat them different but...
$ ls -lQuoted 9 lines
crw-r----- 1 root root 109, 0 Jan 29 18:46 group brw-rw---- 1 informix informix 58, 1 Jan 29 19:10 infx_data1 brw-rw---- 1 informix informix 58, 0 Jan 29 19:09 infx_rootThanks,
Chris Anderson
[email protected]Content-Description: S/MIME Cryptographic Signature
[Attachment, skipping...]
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Systemmanagement CS-TS T-Nova
Entwicklungszentrum Darmstadt
Heinz Mauelshagen Otto-Roehm-Strasse 71c
Senior Systems Engineer Postfach 10 05 4164205 Darmstadt [email protected] Germany +49 6151 886-425 FAX-386=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Hi,
Quoted 4 lines · Chris Anderson
Quoted 1 line · Heinz Mauelshagen
Please have a look at the rawio support for Linux.
Where can I find this? In the kernel? Any help would be great.
2.3 has it, and there are 2.2 patches on
ftp://ftp.uk.linux.org/pub/linux/sct/fs/raw-io
It comes with all recent Red Hat and SuSE distributions as standard, btw. I'm not sure about other distributions (anyone know?)
--Stephen
Quoted 4 lines · Stephen C. Tweedie
Hi,
On Sat, 19 Feb 2000 07:08:29 -0600, Chris Anderson <[email protected]> said:
Quoted 8 lines
Quoted 4 lines
Quoted 1 line · Heinz Mauelshagen
Please have a look at the rawio support for Linux.
Where can I find this? In the kernel? Any help would be great.
2.3 has it, and there are 2.2 patches on
ftp://ftp.uk.linux.org/pub/linux/sct/fs/raw-io
Thanks. I used the link and download the files.
It is odd how it is used. I had to hack it into 2.2.14, but go it working.
I think the "raw" command is odd, also it needs to be run every time you reboot. Also who is the owner of this code. How does it find its way into the standard 2.3 and lvm has not yet? That is odd too.
My test with Informix IDS 7.3 for linux showed that the raw io is twice as slow. A 17 mins load under block device using lvm but took 31mins for the raw linked version. I will be testing the Informix 9.2 version tonight. I could not find much doc from informix other then the device need to be char/raw.
Anyone using raw out there? Did you find that you must call raw at reboot to link back? Who is the owner of the code? What are the next step for the raw code? Any thing would be great?
Thanks,
Chris Anderson
Quoted 6 lines
It comes with all recent Red Hat and SuSE distributions as standard, btw. I'm not sure about other distributions (anyone know?)
--Stephen
Quoted 13 lines · Chris Anderson
Quoted 11 lines · Stephen C. Tweedie
Hi,
Quoted 4 lines · Chris Anderson
Quoted 1 line · Heinz Mauelshagen
Please have a look at the rawio support for Linux.
Where can I find this? In the kernel? Any help would be great.
2.3 has it, and there are 2.2 patches on
Quoted 8 lines
Quoted 1 line
ftp://ftp.uk.linux.org/pub/linux/sct/fs/raw-io
Thanks. I used the link and download the files.
It is odd how it is used. I had to hack it into 2.2.14, but go it working.
I think the "raw" command is odd, also it needs to be run every time you reboot. Also who is the owner of this code. How does it find its way into the standard 2.3 and lvm has not yet? That is odd too.
LVM is in 2.3.47.
Quoted 5 lines
My test with Informix IDS 7.3 for linux showed that the raw io is twice as slow. A 17 mins load under block device using lvm but took 31mins for the raw linked version. I will be testing the Informix 9.2 version tonight. I could not find much doc from informix other then the device need to be char/raw.
rawio does not do any caching (as the name says), so you probably need to configure the database to cache more on itself.
-Andi
[linux-lvm] LVM Petition (Or, page-to-show-our-interest-for-LVM-in-the-Kernel :)
Quoted 1 line · Andi Kleen
LVM is in 2.3.47.
This is I'm sure a great day for us all - I noticed this, went to add it to the "news" section on the petition page (I've been told "petition" was a poor word choice, but at the time I couldn't think of anything better - and the name (as taken from the subject) would sound a little funny... ;)
- I also updated all the links to point to the correct posts (apologies for not noticing it before - the archives changed, and all links to the posts changed with it..) - anyways, I just thought I'd post my 2 cents worth of trivial information before I go back to lurking...
Dominic
P.S> Finally got to play with LVM on a SuSE box here at work... Aah, feels good to be back in good old LVM-land again... :)
Signature · 4 lines
Dominic J. Eidson
"Baruk Khazad! Khazad ai-menu!" - Gimli
--------------------------------------------------------------------------------
http://www.the-infinite.org/ http://www.the-infinite.org/~dominic/Hi,
Quoted 3 lines · Chris Anderson
It is odd how it is used. I had to hack it into 2.2.14, but go it working.
I think the "raw" command is odd, also it needs to be run every time you reboot.
Indeed --- the raw interfaces need to be bound to specific devices just as eth* network interface names need to be bound to addresses.
Quoted 2 lines
Also who is the owner of this code. How does it find its way into the standard 2.3 and lvm has not yet? That is odd too.
lvm just took a little longer --- they are both in 2.3 now.
Quoted 4 lines
My test with Informix IDS 7.3 for linux showed that the raw io is twice as slow. A 17 mins load under block device using lvm but took 31mins for the raw linked version. I will be testing the Informix 9.2 version tonight.
Raw IO does not do any caching in the O/S. Specifically, it doesn't perform any readahead or writebehind. If the application was using that implicit caching then raw IO will necessarily be slower.
--Stephen