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тАО07-10-2003 09:11 AM
тАО07-10-2003 09:11 AM
mirror MC/SG problem
With comand lvdisplay -v /dev/vg11/lvol1 you see this
---- Logical Extents ------
LE PV1 PE1 Status 1 PV2 PE2 Status 2
0000 /dev/dsk/c5t0d0 0000 current /dev/dsk/c20t0d0 0000 current
After a reboot, we start MC/SG package and it activates the vg11 and vg12, but i see know that the c20 is taking the place of c5.
---- Logical Extents ------
LE PV1 PE1 Status 1 PV2 PE2 Status 2
0000 /dev/dsk/c20t0d0 0000 current /dev/dsk/c5t0d0 0000 current
Please, i want you to help me to know why the system changes the disks?
it means that i??m using the disc with less performance?
Is a Mirror Problem?
thanks for your help.
i attach the lvmtab file and the vg11.conf
my email is jeortizg@hotmail.com
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тАО07-10-2003 09:23 AM
тАО07-10-2003 09:23 AM
Re: mirror MC/SG problem
You may have swapped it 'round by doing pvchange -s y /dev/dsk/....
This is temporary & the next re-boot will plip it back.
OR
when you add a logical volume to one system you do a vgexport -m /tmp/vgxx.map -s -p -v vgxx & then a vgimport -m /tmp/vgxx.map -s -v vgxx. Although this usually imports it in lowest number first.
If you want to make it more permanent...
dont do vgexport & vgimport with the -s flag. so do
vgimport -m /tmp/vgxx.map -v vgxx /dev/dsk/... /dev/dsk/...
& OR keep a copy of a "good" /etc/lvmtab.good & copy it back onto the /etc/lvmtab. this option is probably far from supported!!!
Regards
Tim
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тАО07-10-2003 09:26 AM
тАО07-10-2003 09:26 AM
Re: mirror MC/SG problem
BTW, don't expect too much performance penalty... writes go always to both disks and reads go to the disk with the sortest queue.
Best regards...
Dietmar.
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тАО07-10-2003 09:35 AM
тАО07-10-2003 09:35 AM
Re: mirror MC/SG problem
si it configurable? is HW definition ?
thanks.
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тАО07-12-2003 03:14 AM
тАО07-12-2003 03:14 AM
Re: mirror MC/SG problem
If you see the /etc/lvmtab file then you will not find the entry of C20t0d0
So according to me rename the /etc/lvmtab file and create the new file with
vgscan -a -v
This command will scan all the logical volume and create the /etc/lvmtab file
After this You check the lvdisplay -v /dev/vg11/lvol1 command
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тАО07-12-2003 05:42 AM
тАО07-12-2003 05:42 AM
Re: mirror MC/SG problem
What model servers please?
HW addresses are determined by the slot position in the system board. While disk controller target numbers are based upon the HW address.
For example here are a couple of L class / rp54## server slots:
9
Turbo
0/6/0
Turbo
0/6/0
Turbo
0/9/0
8
Turbo
0/2/0
Turbo
0/2/0
Turbo
0/3/0
See this link:
http://www.docs.hp.com/hpux/onlinedocs/A5191-96022/A5191-96022.html
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тАО07-13-2003 01:37 AM
тАО07-13-2003 01:37 AM
Re: mirror MC/SG problem
But, you can change primary path with command:
2. pvchange -s /dev/dsk/"old alternate"
This will make the old alternate into the new primary. However,
it is only temporary, and on the next reboot or package halt/restart,
it will revert to the original configuration.
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тАО07-13-2003 10:55 AM
тАО07-13-2003 10:55 AM
Re: mirror MC/SG problem
- You alternate paths to spread the IO load over as many interfaces as possible. Even when mirroring one "disk" will be more active than the other. (write does equal IO, read IO only required from one disk)
- pvchange ... Will work, until the next boot when it will revert back to its original state.
Just my 0.02??? worth
Tim