[Veritas-vx] How to force Veritas to mirror to the same disk

robertinoau

2004-05-06 04:47:52 UTC

Thre is always more than one way to skin a cat :-)

The short is answer is no we can't force VM using
vxassist.

The way I see it we have 2 options.

First option is to create a a concat volume called
picsvol1 with disk00. Creat a file system on it,
mount it and copy the data frmo picsvol to picsvol1.
After you have confirmed data is intact, you run
remove picsvol and then run vxedit and rename picsvol1
to picsvol.

Second option is to manually create a suddisk and plex
and then attack it to the volume. Ugly but it will
work.

Personall I think option 1 is make easier.....

--- ***@orangemail.nl wrote: > Dear
coleagues,

Post by g***@orangemail.nl
I have several 2 way stripped volumes which I vould
like to convert without
downtime to concat volumes, all on the same disk,
disk00.
I do not want to use relayout because of some
problems experienced in the
Vxassist mirror volname0 layout=concat disk00
Vxassist mirror volname1 layout=concat disk00
Vxassist mirror volname2 layout=concat disk00
Then
Vxplex -o rm dis plex01_of_volname0
Vxplex -o rm dis plex01_of_volname1
Etc.
The problem is that disk00 is already part of the
stripped volumes and
attempting the mirror operation gives the following
$ vxassist -b mirror picsvol layout=concat disk00
vxvm:vxassist: ERROR: Cannot allocate space to
mirror 41943040 block volume
It is of course plenty of space there (and
contiguous), the only reason I
think it fails is because for good reason, the
sistem refuses to allow me to
build a mirrored volume with both plexes depending
on disk00
$ vxdg free
GROUP DISK DEVICE TAG
OFFSET LENGTH
FLAGS
rootdg disk00 c2t107d66s2 c2t107d66
374192640 81008640 n
How can I force this operation to happen ? Will the
-f flag work in this
case ?
$ vxprint -Aht picsvol
Disk group: rootdg
V NAME RVG KSTATE STATE
LENGTH READPOL PREFPLEX
UTYPE
PL NAME VOLUME KSTATE STATE
LENGTH LAYOUT NCOL/WID
MODE
SD NAME PLEX DISK DISKOFFS
LENGTH [COL/]OFF DEVICE
MODE
SV NAME PLEX VOLNAME NVOLLAYR
LENGTH [COL/]OFF AM/NM
MODE
DC NAME PARENTVOL LOGVOL
SP NAME SNAPVOL DCO
v picsvol - ENABLED ACTIVE
41943040 SELECT picsvol-01
fsgen
pl picsvol-01 picsvol ENABLED ACTIVE
41955712 STRIPE 2/128
RW
sd disk00-14 picsvol-01 disk00 340623360
20977920 0/0 c2t107d66
ENA
sd disk01-14 picsvol-01 disk01 334275840
5247360 1/0 c2t107d67
ENA
sd disk02-14 picsvol-01 disk02 334275840
5247360 1/5247360 c2t107d68
ENA
sd disk03-14 picsvol-01 disk03 334275840
5247360 1/10494720 c2t107d69
ENA
sd disk04-14 picsvol-01 disk04 334275840
5230080 1/15742080 c2t107d70
ENA
(As you can see the volume right now is a mess, with
even numbered stripes
from one disk and odd numered stripes from 4
different disks.

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Post by g***@orangemail.nl
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