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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.

• global interfaces files ib0→eth1→eth0
  • priority order, seems useful
  • set in a file somewhere

• backup beeGFS EA metadata, see faq
  • attempt a restore
  • or just snapshot

• storage server tuning
  • set on cottontail on sdb, both values were 128 (seems to help – late summer 2016)
  • echo 4096 > /sys/block/sd?/queue/nr_requests
  • echo 4096 > /sys/block/sd?/queue/read_ahead_kb
  • set on cottontail, was 90112 + /etc/rc.local
  • echo 262144 > /proc/sys/vm/min_free_kbytes
• do same on greentail?
  • all original values same as cottontail (all files)
  • set on c1d1 thru c1d6
• do same on sharptail?
  • no such values for sdb1
  • can only find min_free_kbytes, same value as cottontail

• tuneNumWorkers in all /etc/beegfs/beggfs-C.conf file
  • for meta, storage and clients …

• metadata server tuning
  • read in more detail

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