topic Re: syncronizing mirror disks in Operating System - HP-UX

syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 03:55:04 GMT

¿Is it possible to work (i/o writes and reads) on volume group than is syncronizing (vgsync) because one mirror disk failed?

Thanks a lot, folks.

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 03:57:21 GMT

Explain in details. I could not understant what you are trying to do.

Re: syncronizing mirror disks

Robert-Jan Goossens_1 — Fri, 31 Mar 2006 03:59:16 GMT

is it possible to work on a system when vg00 is being synced ?

answer yesm it will be slower but you an work while a system is syncing its mirrors.

Regards,
Robert-Jan

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 04:01:37 GMT

I replace a disk in a volume group that failed. This volume group have 4 disk in mirror (2 to 2). I'm synchronizing the volume group. While this process is running, users can work (i/o reads and writes) on this volume group?

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 04:05:57 GMT

Yes. Without problems. Before you resync, you will have to do following.

vgcfgrestore -n /dev/vgxx /dev/dsk/cxtxdx
vgchange -a y vgxx
vgsync vgxx

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 04:10:23 GMT

OK. Thanks a lot. Another question is I run this process in foreground. Is any way to convert in background as I ran with "nohup" to I can close the telnet session?

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 04:22:54 GMT

As I understand, wether, you run it with nohup or not, LVM spawns another processes, which does syncing work.

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 04:30:40 GMT

Then , if I close the session (sh) sync process will not finish and his father will be process number 1, isnÂ´t it ?
But isnÂ´t there a way to send process back whit "bg pid" command?

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 04:33:00 GMT

Start it in background.

nohup vgsync vgxx &

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 04:34:55 GMT

I mean, if your process already running ...

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 04:46:11 GMT

If your processes is already running, you should be able to put in suspended mode first. (Assuming that you did not change stty settings. ^Z is default suspend. cntrl+Z)
Once you suspend it, (Chances are that it has already started LVM process in the background) check it with jobs command and then you would be able to do
bg "job_id"

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 04:57:19 GMT

I canÂ´t whith this keys. Is there another way using his pid?

Re: syncronizing mirror disks

RAC_1 — Fri, 31 Mar 2006 04:59:16 GMT

Do you want to force a process to go into background? May be that is possible, but not without some strong C coding. What exactly makes you worry about it?

Re: syncronizing mirror disks

Carlos_172 — Fri, 31 Mar 2006 05:19:20 GMT

Thans a lot