Hello,
a little update for my problem of missing metadata.
Just to remind you, I have 9 storage nodes, and 1 metadata server.
The data on the server, for an hardware problem, for a software
problem, is lost. The /pvfs2-storage-space on the storage nodes is ok,
I can read bit and pieces, find back some small text files, and there
are some db files, like collections.db, storage_attributes.db,
collection_attributes.db, dataspace_attributes.db, __db.001, keyval.db.
The relevant portion of the pvfs2-fs.conf is:
############
<Filesystem>
Name pvfs2-fs
ID 1950640382
RootHandle 1048576
<MetaHandleRanges>
Range master-pvfs 4-429496732
</MetaHandleRanges>
<DataHandleRanges>
Range node1-pvfs 429496733-858993461
Range node2-pvfs 858993462-1288490190
Range node3-pvfs 1288490191-1717986919
Range node4-pvfs 1717986920-2147483648
Range node5-pvfs 2147483649-2576980377
Range node6-pvfs 2576980378-3006477106
Range node7-pvfs 3006477107-3435973835
Range node8-pvfs 3435973836-3865470564
Range node9-pvfs 3865470565-4294967293
</DataHandleRanges>
<StorageHints>
TroveSyncMeta yes
TroveSyncData no
</StorageHints>
</Filesystem>
############
I give up. I cannot retrieve the data on the master node.
Is there a chance to rebuild the data somehow from the storage nodes
only? At least partial data. It does not matter how slow it could take.
Thanks for all the help so far.
Raimondo Giammanco
Hello Mr. Lang,
well, the mystery is not lifted yet. I got a hold unexpectedly of the
previous admin, and indeed it seems there is something
wrong with the machine. There is a secondary hard-disk that he had put
under lvm that is not responding anymore:
fdisk reports problem with the partition table, and no logical volumes
are found by the lvm tools.
Is this the problem? I do not know. It never occurred to me that there
could be another hd since there was
no mention in the fstab. So maybe a flying mount... Strange. But
stranger still is the timestamp of the directory
in the pvfs2-storage-space in the master..
I had a joint screen session with the previous admin yesterday as I
said, but the problem, namely
recovering this lvm setup was not resolved. I hope to be able to have
him help me again,
I will keep you informed on the progress.
Thanks again.
Raimondo
Sam Lang wrote:
On Oct 10, 2007, at 3:51 AM, Raimondo Giammanco wrote:
Hello Mr. Lang,
As far as I understand, on the master /pvfs2-storage-space is not a
mount point. /etc/fstab has no mention of it, and the directory it
contains (744468fe) has a timestamp that is relative to the day we
had to shutdown the master, so I cannot think that there was
something mounted there..
So, I am fairly certain /pvfs2-storage-space on the master was
related to the metadata, but it is empty.
Hi Raimondo,
Somehow then a number of files in your storage space on the master
have gone missing. Without them, you won't be able to start that
server, and you will have to recreate the storage space (destroying
the files that were there). I'm a little skeptical that the files
just vanished (it looks like they were deleted somehow), which is why
I suggested the storage space might not be mounted properly. Do you
get anything interesting when you run fsck on /dev/sda1? What
raid-level was used for the raid device?
I guess the big question is whether you can just ask the person you
inherited administration from what the setup was before. That would
save us a lot of trouble trying to figure it out post-mortem.
-sam
If I were to initialize it with the -f option, would after
reconstruct the data from the IO nodes, were all seems correct and
the pvfs2-server process started correctly?
This seems rather risky to me.
Thanks for your help.
Raimondo
Sam Lang wrote:
On Oct 9, 2007, at 12:57 PM, Raimondo Giammanco wrote:
Hello Mr. Lang,
the master is a different unit type, different from the nodes
that are blades in a rack mounted cluster.
The mount command provides on the master: ##################
/dev/sda1 on / type ext3 (rw) none on /proc type proc (rw) none
on /sys type sysfs (rw) none on /dev/pts type devpts
(rw,gid=5,mode=620) usbfs on /proc/bus/usb type usbfs (rw) none
on /dev/shm type tmpfs (rw) none on /proc/sys/fs/binfmt_misc
type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type
rpc_pipefs (rw) nfsd on /proc/fs/nfsd type nfsd (rw)
##################
while on the node it is ################## /dev/ram0 on / type
ext2 (rw) none on /proc type proc (rw) none on /sys type sysfs
(rw) none on /dev/pts type devpts (rw,gid=5,mode=620) usbfs on
/proc/bus/usb type usbfs (rw) none on /dev/shm type tmpfs (rw)
/dev/md0 on /tmp type ext3 (rw) /dev/md1 on
/pvfs2-storage-space type ext3 (rw) none on
/proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on
/var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) 10.0.0.254:/home
on /home type nfs (rw,addr=10.0.0.254) 10.0.0.254:/usr on /usr
type nfs (rw,addr=10.0.0.254) 10.0.0.254:/opt on /opt type nfs
(rw,addr=10.0.0.254) nfsd on /proc/fs/nfsd type nfsd (rw)
#####################
The difference is, I believe, that the master has a hardware
raid,
Is the hardware raid /dev/sda1 mounted to / ? If not, maybe the
hardware raid on the master needs to be mounted to
/pvfs2-storage-space?
while the nodes have 2 small hd in software raid for the system
and temporary data, and 2 big ones, still in software raid, for
pvfs.
Ok that explains the lost+found. FYI, while the
/pvfs2-storage-space may exist as a directory in /, it can also
be a mountpoint for something else, so its contents may not be
visible (at least the contents you would expect) if you haven't
mounted everything properly.
-sam
Regards, Raimondo
On Oct 9, 2007, at 9:40 AM, Giammanco Raimondo wrote:
Hello Mr. Ross,
thanks for your prompt reply.
I believe the config file you mention is (for my case)
/etc/pvfs2- server.conf-master-pvfs. its contents are:
############################ StorageSpace
/pvfs2-storage-space HostID "tcp://master-pvfs:3334"
LogFile /tmp/pvfs2-server.log ############################
The config file for a node,
/etc/pvfs2-server.conf-node1-pvfs for example, is the
following: ############################ StorageSpace
/pvfs2-storage-space HostID "tcp://node1-pvfs:3334" LogFile
/tmp/pvfs2-server.log ############################
Now, this /pvfs2-storage-space is unfortunately directly on
the /, so the wrong mount timing theory is unfortunately to
discard.
In the directory listing you gave us for node1
/pvfs2-storage-space, there's a lost+found directory. That
only appears if you've mounted another volume into that
directory. My guess is that for the master node, you've
managed to somehow create part of the storage space before
mounting something to /pvfs2-storage-space, and the rest was
created after. You're only seeing what was created before
the mount. That's just a guess though. Can you send us the
output of 'mount' on node1 and master?
-sam
On the nodes instead /pvfs2-storage-space it is on a
mounted filesystem, /dev/md1, but there all goes apparently
right, so it seems to me that really there is a problem
with the master node and metadata server.
The suggestion given by the log of pvfs2-server binary of
using the -f option looks very dangerous to me, or in case
of the metadata server it is ok, in the sense that it will
reconstruct the data from the IO nodes? I cannot understand
why the different storages have the same directory in
common "744468fe", but the master has nothing else beside
this empty directory.
Even if the pvfs2-server process had been killed in a not
clean way on the master and metadata server, it would not
have been able (I assume) to delete data on the storage
directory...
So this absence of data in /pvfs2-storage-space for the
metadata server is both disconcerting and confusing...
Hope this mail will help us to proceed further.
Best Regards Raimondo
Rob Ross wrote:
Hi Raimondo,
Two things. One, there is a second config file around
that specifies the storage directory etc. You should be
able to find it in /etc/ also. Please send that to us.
An idea is that perhaps /pvfs2-storage-space is a mounted
file system, and that somehow it is getting mounted
*after* the server is started? Just a blind guess. If you
try to start the service after the system has finished
booting, does it do the same thing?
Thanks,
Rob
Raimondo Giammanco wrote:
Hello, there.
I am coming here seeking words of wisdom. I have looked
the interweb and this list but I cannot seem to find
useful informations, so I post here. I apologize if the
answer to the question has already been provided and I
could not find it.
I have a problem with a pvfs2 installation that has
been set-up by a third person. The cluster has been
shutdown cleanly for a scheduled maintenance on the
power lines, and I cannot bring pvfs2 up again.
Here is the description.
There is a cluster using a fronted and 9 nodes.
As far as I understand, the fronted is a metadata
server, and the nodes are IO servers, as for the
/etc/pvfs2-fs.conf file I present here below:
#################### <Defaults> UnexpectedRequests 50
EventLogging none LogStamp datetime BMIModules bmi_tcp
FlowModules flowproto_multiqueue PerfUpdateInterval
1000 ServerJobBMITimeoutSecs 30
ServerJobFlowTimeoutSecs 30 ClientJobBMITimeoutSecs 300
ClientJobFlowTimeoutSecs 300 ClientRetryLimit 5
ClientRetryDelayMilliSecs 2000 </Defaults>
<Aliases> Alias master-pvfs tcp://master-pvfs:3334
Alias node1-pvfs tcp://node1-pvfs:3334 Alias node2-pvfs
tcp://node2-pvfs:3334 Alias node3-pvfs
tcp://node3-pvfs:3334 Alias node4-pvfs
tcp://node4-pvfs:3334 Alias node5-pvfs
tcp://node5-pvfs:3334 Alias node6-pvfs
tcp://node6-pvfs:3334 Alias node7-pvfs
tcp://node7-pvfs:3334 Alias node8-pvfs
tcp://node8-pvfs:3334 Alias node9-pvfs
tcp://node9-pvfs:3334 </Aliases>
<Filesystem> Name pvfs2-fs ID 1950640382 RootHandle
1048576 <MetaHandleRanges> Range master-pvfs
4-429496732 </MetaHandleRanges> <DataHandleRanges>
Range node1-pvfs 429496733-858993461 Range node2-pvfs
858993462-1288490190 Range node3-pvfs
1288490191-1717986919 Range node4-pvfs
1717986920-2147483648 Range node5-pvfs
2147483649-2576980377 Range node6-pvfs
2576980378-3006477106 Range node7-pvfs
3006477107-3435973835 Range node8-pvfs
3435973836-3865470564 Range node9-pvfs
3865470565-4294967293 </DataHandleRanges>
<StorageHints> TroveSyncMeta yes TroveSyncData no
</StorageHints> </Filesystem> ####################
The nodes are apparently working correctly, at boot the
/etc/ init.d/pvfs2 script worked and the log file
(/tmp/pvfs2-server.log) gives me for a node:
#################### [D 10/08 14:39] PVFS2 Server
version 2.6.2 starting. ####################
on the master instead, it gives #################### [D
10/09 11:09] PVFS2 Server version 2.6.2 starting. [E
10/09 11:09] Error: trove_initialize: No such file or
directory [E 10/09 11:09]
*********************************************** [E
10/09 11:09] Invalid Storage Space:
/pvfs2-storage-space
[E 10/09 11:09] Storage initialization failed. The
most common reason for this is that the storage space
has not yet been created or is located on a partition
that has not yet been mounted. If you'd like to create
the storage space, re-run this program with a -f
option. [E 10/09 11:09]
*********************************************** [E
10/09 11:09] Error: Could not initialize server
interfaces; aborting. [E 10/09 11:09] Error: Could not
initialize server; aborting. ####################
Now, the storage space on the nodes is full:
#################### [EMAIL PROTECTED] ~]# ls
/pvfs2-storage-space/ 744468fe collections.db
lost+found storage_attributes.db ####################
on the master (frontend) not: ####################
[EMAIL PROTECTED] ~]# ls /pvfs2-storage-space/ 744468fe
####################
Anyone can point me in the right direction?
Thanks Again
Raimondo
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fn:Raimondo Giammanco
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email;internet:[EMAIL PROTECTED]
title:Senior Research Engineer
tel;work:+3223599763
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