[Linux-cluster] some questions about setting up GFS

[Jonathan E Brassow]

It looks like you are not using pool.

You seem to have divided up the storage sanely.  However, rather than 
forming a pool logical volume on the partitions you've created and then 
putting ccs and gfs on the pool volumes, you have simply put ccs and 
gfs directly on the underlying device.  This is not terrible if you can 
ensure that your devices will _always_ have the same name, regardless 
of the machine you are viewing them from.  (Pool's main function is to 
write labels to the underlying devices so that they can be uniquely 
identified on every machine in the cluster.)

So, at this point, you can choose to forget about using pool and 
proceed as you have started; or you can set up your pools first and put 
ccs and gfs on them (this is the method normally used).

If you choose to set up pools, you would do something like:
# create config files for two different pools (one for ccs and one for 
gfs)
prompt> cat > cca_pool.cfg
poolname cca
subpools 1
subpool 0 0 1 gfs_data
pooldevice 0 0 /dev/cciss/c0d1p1

prompt> cat > gfs1_pool.cfg
poolname gfs1
subpools 1
subpool 0 0 1 gfs_data
pooldevice 0 0 /dev/cciss/c0d1p2

#Write the labels to disk - remember this only needs to be done once
prompt> pool_tool cca_pool.cfg
prompt> pool_tool gfs1_pool.cfg

#Instantiate the pool logical volumes
prompt> pool_assemble

#Now you have block devices called /dev/pool/cca and /dev/pool/gfs1
# create your CCS archive and gfs file system on these devices
prompt> ccs_tool create /root/cluster /dev/pool/cca
prompt> mkfs.gfs ... /dev/pool/gfs1

  brassow

On Jan 11, 2005, at 2:34 AM, Sergey wrote:

> Hello!
>
> We bought HP ProLiant DL380 G4 Packaged Cluster-MSA500 G2 server and
> after installation of RHEL3 and GFS-6.0.0-15 I have some questions.
>
> Because I have no expirience in setting up such systems, please, tell
> me, which mistakes in configuration I made.
>
> Now system is configured this way:
>
> /dev/cciss/c0d1 - External Logical Volume, 293.6 Gbytes (RAID 5)
>
> ===================
> [root at hp1 root]# fdisk /dev/cciss/c0d1
> Command (m for help): p
>
> Disk /dev/cciss/c0d1: 293.6 GB, 293626045440 bytes
> 255 heads, 63 sectors/track, 35698 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
>            Device Boot    Start       End    Blocks   Id  System
> /dev/cciss/c0d1p1             1         9     72261   fd  Linux raid 
> autodetect
> /dev/cciss/c0d1p2            10     35698 286671892+  fd  Linux raid 
> autodetect
>
> I've found nothing in GFS documentation about partitioning hard drive
> during setting up GFS. So, I used to experiment.
>
> First partition is allocated for <- CCA device ->. I'd like to know if
> there is enough space and right type of partition, and, at all, is it
> right way to allocate <- CCA device ->.
>
> Second partition was formatted as GFS, so the question is: is selected
> type of partition right or not?
>
> ===================
>
> [root at hp1 root]# cat pool0.cfg
> poolname pool0
> minor 0 subpools 2
> subpool 0 0 1 gfs_journal
> pooldevice 0 0 /dev/cciss/c0d1p1
> subpool 1 0 1 gfs_data
> pooldevice 1 0 /dev/cciss/c0d1p2
>
>
> Actually, I don't know why, but first subpool I've made as gfs_journal 
> :-)
>
> Basically, the system works, but something may be wrong.
>
> ===================
> During setting up I've made this command:
>
> [root at hp1 root]# ccs_tool create /root/cluster/ /dev/cciss/c0d1p1
>
> [root at hp1 root]# pool_tool -s
>  Device                                            Pool Label
>  ======                                            ==========
>  /dev/cciss/c0d0                  <- partition information ->
>  /dev/cciss/c0d0p1                    <- EXT2/3 filesystem ->
>  /dev/cciss/c0d0p2                          <- swap device ->
>  /dev/cciss/c0d0p3                    <- EXT2/3 filesystem ->
>  /dev/cciss/c0d1                  <- partition information ->
>  /dev/cciss/c0d1p1                           <- CCA device ->
>  /dev/cciss/c0d1p2                       <- GFS filesystem ->
>
> I'd like to hear some comments on it.
>
> ===================
>
> Thanks.
>
> --
> Sergey Mikhnevich
>
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