This is an old revision of the document!
A document for me to recall and make notes of what I read in the manual pages and what needs testing.
Basically during the Summer of 2016 I investigated if the HPCC could afford enterprise level storage. I wanted 99.999% uptime, snapshots, high availability and other goodies such as parallel NFS. Netapp came the closest but, eh, still at $42K lots of other options show up. The story is detailed here at The Storage Problem
This page is best read from the bottom up.
idea: buy 2 now 4k+4k then 3rd in july 4k? move test users over on 2 nodes, test, only change is $HOME ctt (mngt+admingiu), 2 new units storage (+snapshots/meta backup), ctt2 meta + n38/39 backup meta
make ctt2 master meta node? how?
# enable [root@n7 ~]# beegfs-ctl --mirrormd /mnt/beegfs/hmeij-mirror Mount: '/mnt/beegfs'; Path: '/hmeij-mirror' Operation succeeded. # put some new content in [root@n7 ~]# rsync -vac /home/hmeij/iozone-tests /mnt/beegfs/hmeij-mirror/ # lookup meta tag [root@n7 ~]# beegfs-ctl --getentryinfo /mnt/beegfs/hmeij-mirror/iozone-tests/current.tar Path: /hmeij-mirror/iozone-tests/current.tar Mount: /mnt/beegfs EntryID: 3-581392E1-31 # find [root@sharptail ~]# ssh n38 find /data/beegfs_meta -name 3-581392E1-31 /data/beegfs_meta/mirror/49.dentries/54/6C/0-581392F0-30/#fSiDs#/3-581392E1-31 # and find [root@sharptail ~]# ssh n39 find /data/beegfs_meta -name 3-581392E1-31 /data/beegfs_meta/dentries/54/6C/0-581392F0-30/#fSiDs#/3-581392E1-31 # seems to work
Looks like:
# file content [root@swallowtail ~]# ls -lR /data/beegfs_storage/chunks/u0/57E4/2/169-57E42E75-31 /data/beegfs_storage/chunks/u0/57E4/2/169-57E42E75-31: total 672 -rw-rw-rw- 1 root root 289442 Jun 26 2015 D8-57E42E89-30 -rw-rw-rw- 1 root root 3854 Jun 26 2015 D9-57E42E89-30 -rw-rw-rw- 1 root root 16966 Jun 26 2015 DA-57E42E89-30 -rw-rw-rw- 1 root root 65779 Jun 26 2015 DB-57E42E89-30 -rw-rw-rw- 1 root root 20562 Jun 26 2015 DF-57E42E89-30 -rw-rw-rw- 1 root root 259271 Jun 26 2015 E0-57E42E89-30 -rw-rw-rw- 1 root root 372 Jun 26 2015 E1-57E42E89-30 [root@petaltail ~]# ls -lR /var/chroots/data/beegfs_storage/chunks/u0/57E4/2/169-57E42E75-31 /var/chroots/data/beegfs_storage/chunks/u0/57E4/2/169-57E42E75-31: total 144 -rw-rw-rw- 1 root root 40 Jun 26 2015 DC-57E42E89-30 -rw-rw-rw- 1 root root 40948 Jun 26 2015 DD-57E42E89-30 -rw-rw-rw- 1 root root 100077 Jun 26 2015 DE-57E42E89-30 # meta content [root@sharptail ~]# ssh n38 find /data/beegfs_meta -name 169-57E42E75-31 /data/beegfs_meta/inodes/6A/7E/169-57E42E75-31 /data/beegfs_meta/dentries/6A/7E/169-57E42E75-31 [root@sharptail ~]# ssh n39 find /data/beegfs_meta -name 169-57E42E75-31 (none, no mirror)
[root@n7 ~]# beegfs-ctl --getentryinfo /mnt/beegfs/ Path: Mount: /mnt/beegfs EntryID: root Metadata node: n38 [ID: 48] Stripe pattern details: + Type: RAID0 + Chunksize: 512K + Number of storage targets: desired: 4