|
|
Sponsored Content
Operating Systems
AIX
LVM & Raw device i/o comparison
Post 302579173 by royalliege on Monday 5th of December 2011 03:31:46 AM
12-05-2011
LVM & Raw device i/o comparison
Please consider this a question about basics&best practices. On AIX 5.3 system, three raw physical volumes are defined from storage. While doing a read with command dd from the raw device, the speed rate is 250Mb/s.
Then, it gets complex when I define these three pv's to an lv of type raw. Doing a read from raw lv, the speed rate is 11Mb/s for each pv's giving a total of 33Mb/s.
I tried with different options sequential, parallel ...
Still no luck of getting closer to 250Mb/s. Is it reasonable or is there a best practice of getting closer to the speed rate with some parameters at the time of creating lv?
thanks
Then, it gets complex when I define these three pv's to an lv of type raw. Doing a read from raw lv, the speed rate is 11Mb/s for each pv's giving a total of 33Mb/s.
I tried with different options sequential, parallel ...
Still no luck of getting closer to 250Mb/s. Is it reasonable or is there a best practice of getting closer to the speed rate with some parameters at the time of creating lv?
thanks|
|
10 More Discussions You Might Find Interesting
1. Filesystems, Disks and Memory
Hi all!
Working on Oracle v8.1.7.0.0 with OS as Suse v8.0 Linux.
I had created LVM,linked raw devices to LVM as below:
# for binding raw devices
raw /dev/raw/raw1 /dev/oracle/sam_raw_system_251m
raw /dev/raw/raw2 /dev/oracle/sam_raw_users_26m
raw /dev/raw/raw3... (2 Replies)
Discussion started by: Amitstora
2 Replies
2. AIX
Hy
I have several logical volumes that are turned into raw devices used by Informix DB. I would like to add some more.
In /dev directory i see logical volumes as block files: lv_name1, lv_name2 ...
and
i see raw devices defined as character files:
rlv_name1, rlv_name2 ...
As i see,... (5 Replies)
Discussion started by: veccinho
5 Replies
3. UNIX for Advanced & Expert Users
Hello group,
Is it possible to use partition on a disk as a raw device? I have a LUN on a SAN which I would like to partition and use those partitions as raw device.
If it is feasable, how do I bind them to a device?
For example, say sdd has 3 partitions on it, sdd1, sdd2 and sdd3. Can I... (1 Reply)
Discussion started by: bfay
1 Replies
4. Solaris
Hi All ,
I would like to know the procedure for increasing shared volume space in sun cluster .
Currently the configuration is like these .
Main stripe
oradb1/d91 2 1 /dev/did/rdsk/d35s0 1 /dev/did/rdsk/d36s0 =Total 49 Gb
oradb1/d94 -p oradb1/d91 -o 88080480 -b 14680064 ==Total 7 GB... (4 Replies)
Discussion started by: sahil_shine
4 Replies
5. Red Hat
Hi,
I had a doubt regarding device mapper notations and their corresponding LVM volumes.
I have configured a volume group with two logical volumes in it as root and swap.
The entries in the /etc/fstab file show the dm notations namely,
/dev/mapper/VolGroup00-LogVol01... (2 Replies)
Discussion started by: kanna_geekworkz
2 Replies
6. Solaris
Hi,
I am using Sun Solaris 10 (Sparc 64 bit),
I have a meta device /dev/dsk/emcpower26a mounting on /u01. I want to make this metadeice as raw device.
Need solaris command to remove file system and make it as raw device ?.
Is there any solaris command to check raw devices ?.
Thanks (1 Reply)
Discussion started by: zeeshan047
1 Replies
7. Solaris
Hi,
I need to create 4 zones.
I have an array with a RAID5 volume. I have exported 4 LUNS from the array. Now my host see the 4 LUNS as raw devices.
I am partitioning each LUN using format then mounting each slice on the global zone. Then I am using each slice as a file system for my non... (3 Replies)
Discussion started by: general_lee
3 Replies
8. Solaris
Hi,
I'm trying to find out how to see used space on RAW device.
I tried with prtvtoc -f RAWdevice but for 3 different device I'm getting the same FREE_SIZE which look a bit impossible.
root@zg8cscfb1> prtvtoc -f /dev/md/redodg/rdsk/d300
FREE_START=0 FREE_SIZE=20352 FREE_COUNT=1 FREE_PART=... (2 Replies)
Discussion started by: MarioT
2 Replies
9. UNIX for Dummies Questions & Answers
HI,
I want to start Oracle on UNIX machine, now the , it is failing to startup because it cannot identify a raw device. Actually machine was rebooted and now we need to mount the devices, but i just want to know the command/way to mount or rather start/init a raw device. Please let me know. (2 Replies)
Discussion started by: Onkar Banerjee
2 Replies
10. Red Hat
Hi,
How to find the raw device/multipath details of the LUN used by the diskgroups of the database.
file system type -- ASM
Oracle -- 11.2.0.3.0
OS -- Linux
This is RAC database.
Regards,
Maddy (2 Replies)
Discussion started by: Maddy123
2 Replies
LEARN ABOUT HPUX
cfsetospeed
cfspeed(3C) cfspeed(3C) NAME
cfgetospeed(), cfsetospeed(), cfgetispeed(), cfsetispeed() - tty baud rate functions SYNOPSIS
DESCRIPTION
These functions set and get the input and output speed codes in the termios structure referenced by termios_p. The termios structure con- tains these speed codes representing input and output baud rates as well as other terminal related parameters. Setting the parameters on a terminal file does not become effective until is successfully called. returns the output speed code from the termios structure referenced by termios_p. sets the output speed code in the termios structure referenced by termios_p to speed. The speed code for a baud rate of zero, is used to termi- nate the connection. If is specified, the modem control lines are no longer asserted, which normally discon- nects the line. returns the input speed code from the termios structure referenced by termios_p. sets the input speed code in the termios structure referenced by termios_p to speed. RETURN VALUE
returns the output speed code from the termios structure referenced by termios_p. returns the input speed code from the termios structure referenced by termios_p. and return zero upon successful completion. Otherwise, they return -1 and set to indicate the error. ERRORS
and fail when the following condition is encountered: [EINVAL] The value of speed is outside the range of possible speed codes as specified in WARNINGS
and can be used to set speed codes in the termios structure that are not supported by the terminal hardware. SEE ALSO
tcattribute(3C), thread_safety(5), termio(7). STANDARDS CONFORMANCE
cfspeed(3C)