[Gluster-devel] explanation of errors
Mickey Mazarick
mic at digitaltadpole.com
Mon Mar 17 17:07:45 UTC 2008
They are separate, I meant to imply that there is a Storage-01ns ->
Storage-02ns ->Storage-03ns.
The only thing I'm not doing is double-mirroring the afr volumes.
(ie there is no Storage-01 -> Storage-02afr unified to Storage-01afr ->
Storage-02)
I never really understood the reason for doing this in the examples, but
assumed it would help throughput.
my spec is included below.
####gluster-syster.vol#####
volume main1
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST201
option remote-subvolume system
end-volume
volume main2
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST202
option remote-subvolume system
end-volume
volume main3
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST203
option remote-subvolume system
end-volume
volume main4
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST204
option remote-subvolume system
end-volume
volume main5
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST205
option remote-subvolume system
end-volume
volume main6
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST206
option remote-subvolume system
end-volume
volume main1-2
type cluster/afr
subvolumes main1 main2
# option replicate *:2
end-volume
volume main3-4
type cluster/afr
subvolumes main3 main4
# option replicate *:2
end-volume
volume main5-6
type cluster/afr
subvolumes main5 main6
# option replicate *:2
end-volume
volume main-ns-1
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST201
option remote-subvolume system-ns
end-volume
volume main-ns-2
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST202
option remote-subvolume system-ns
end-volume
volume main-ns-3
type protocol/client
option transport-type ib-verbs/client
option remote-host RTPST203
option remote-subvolume system-ns
end-volume
volume main-ns
type cluster/afr
subvolumes main-ns-1 main-ns-2 main-ns-3
# option replicate *:3
end-volume
volume main
type cluster/unify
option namespace main-ns
subvolumes main1-2 main3-4 main5-6
option scheduler alu # use the ALU scheduler
# option alu.limits.min-free-disk 10GB # Don't create files one a
volume with less than 60GB free diskspace
# option alu.limits.max-open-files 10000 # Don't create files on a
volume with more than 10000 files open
# When deciding where to place a file, first look at the disk-usage,
then at
# read-usage, write-usage, open files, and finally the disk-speed-usage.
option alu.order
disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage
# option alu.disk-usage.entry-threshold 2GB # Kick in if the
discrepancy in disk-usage between volumes is 2GB
# option alu.disk-usage.exit-threshold 60MB # Don't stop until you've
written at least 60MB to the least-used volume
# option alu.open-files-usage.entry-threshold 1024 # Kick in if the
discrepancy in open files is 1024
# option alu.open-files-usage.exit-threshold 32 # Don't stop until
you've written at least 32 files to the least-used volume
# option alu.read-usage.entry-threshold 20% # Kick in when the
read-usage discrepancy is 20%
# option alu.read-usage.exit-threshold 4% # Don't stop until the
discrepancy has been reduced with 4%
# option alu.write-usage.entry-threshold 20% # Kick in when the
write-usage discrepancy is 20%
# option alu.write-usage.exit-threshold 4% # Don't stop until the
discrepancy has been reduced with 4%
option alu.stat-refresh.interval 60sec # Refresh the statistics used
for decision-making every 10 seconds
# option alu.stat-refresh.num-file-create 10 # Refresh the statistics
used for decision-making after creating 10 files
end-volume
volume writebehind
type performance/write-behind
subvolumes main
end-volume
volume readahead
type performance/read-ahead
subvolumes writebehind
end-volume
volume io-cache
type performance/io-cache
subvolumes readahead
end-volume
### If you are not concerned about performance of interactive commands
### like "ls -l", you wouldn't need this translator.
#volume statprefetch
# type performance/stat-prefetch
# option cache-seconds 2 # cache expires in 2 seconds
# subvolumes readahead # add "stat-prefetch" feature to "readahead"
volume
#end-volume
Basavanagowda Kanur wrote:
> Mickey,
> You cannot re-use the namespace as storage volume.
> Make sure you have seperate namespaces, other than the ones in
> storage for glusterfs to work properly.
>
> --
> Gowda
>
> On Mon, Mar 17, 2008 at 10:10 PM, Mickey Mazarick
> <mic at digitaltadpole.com <mailto:mic at digitaltadpole.com>> wrote:
>
> I'm getting a lot of errors on an AFR/unify setup with 6 storage
> bricks
> using ib-verbs and just want some help understanding what is critical.
> for some reason this setup is very unstable and we want to know how to
> make it as robust as the architecture suggests it should be.
>
> The problem is that when we copy any files we get hundreds of the
> following three errors in the client:
> 2008-03-17 12:31:00 E [fuse-bridge.c:699:fuse_fd_cbk] glusterfs-fuse:
> 38: /tftpboot/node_root/lib/modules/2.6.24.1/modules.symbols => -1 (5)
> 2008-03-17 12:31:00 E [unify.c:850:unify_open] main:
> /tftpboot/node_root/lib/modules/2.6.24.1/kernel/arch/x86/kernel/cpuid.ko:
> entry_count is 3
> 2008-03-17 12:31:00 E [unify.c:853:unify_open] main:
> /tftpboot/node_root/lib/modules/2.6.24.1/kernel/arch/x86/kernel/cpuid.ko:
> found on main-ns
>
> Files still copy with these errors but very slowly.
> Additionally we are unable to lose even one storage brick without the
> cluster freezing.
>
>
> We have the pretty common afr/unify setup with 6 storage bricks.
>
> namespace:
> Storage_01 <- AFR -> RTPST202 <-AFR-> Storage_03
>
> storage:
> Storage_01 <- AFR -> Storage_02
> Storage_03 <- AFR -> Storage_04
> Storage_05 <- AFR -> Storage_06
>
> All this is running on TLA ver 703 with a the latest patched fuse
> module.
>
> Any suggestions would be appreciated!
> Thanks!
> -Mickey Mazarick
>
> --
>
>
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>
>
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