| # | Change | User | Description | Committed | |
|---|---|---|---|---|---|
| #4 | 26649 | robert_cowham |
More SDP Doc tidy up. Removed some command summary files. |
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| #3 | 25512 | tom_tyler | Updated doc to match current version of mkrep.sh | ||
| #2 | 23266 | tom_tyler |
Fixes and Enhancements:
* Enabled daily_checkpoint.sh operate on edge servers, to keep /p4/N/offline_db current on those hosts for site-local recovery w/o requiring a site-local replica (though having a site-local replica can still be useful). * Disabled live_checkpoint.sh for edge servers. * More fully support topologies using edge severs, in both geographically distributed and horizaontal scaling "wokspace server" solutions. * Fix broken EDGESERVER value definition. * Modified name of SDP counter that gets set when a checkpoint is taken to incorporate ServerID, so now the counter name will look like lastSDPCheckpoint.master.1, or lastSDPCheckpoint.p4d_edge_sfo, rather than just lastSDPCheckpoint. There will be multiple such counters in a topology that uses edge servers, and/or which takes checkpoints on replicas. * Added comments for all functions. For the master server, journalPrefix remains: /p4/N/checkpoints/p4_N The /p4/N/checkpoints is reserved for writing by the master/commit server only. For non-standby (possibly filtered) replicas and edge serves, journalPrefix is: /p4/N/checkpoints.<ShortServerID>/p4_N.<ShortServerID> Here, ShortServerID is just the ServerID with the 'p4d_' prefix trimmed, since it is redundant in this context. See mkrep.sh, which enshines a ServerID (server spec) naming standard, with values like 'p4d_fr_bos' (forwarding replica in Boston) and p4d_edge_blr (Edge server in Bangalore). So the journalPrefix for the p4d_edge_bos replica would be: /p4/N/checkpoints.edge_bos/p4_N.edge_bos For "standby" (aka journalcopy) replicas, journalPrefix is set to /p4/N/journals.rep. which is written to the $LOGS volume, due to the nature of standby replicas using journalPrefix to write active server logs to pre-rotated journals. Some take-away to be updated in docs: * The /p4/N/checkpoints folder must be reserved for checkpoints that originate on the master. It should be safe to rsync this folder (with --delete if desired) to any replica or edge server. This is consistent with the current SDP. * I want to change 'journals.rep' to 'checkpoints.<ShortServerID>' for non-standby replicas, to ensure that checkpoints and journals taken on those hosts are written to a volume where they are backed up. * In sites with multiple edge serves, some sharing achive files ('workspace servers'), multiple edge servers will share the same SAN. So we one checkpoints dir per ServerID, and we want that dir to be on the /hxdepots volume. Note that the journalPrefix for replicas was a fixed /p4/N/journals.rep. This was on the /hxlogs volume - a presumably fast-for-writes volume, but typically NOT backed up and not very large. This change puts it under /p4/N/checkpoints.* for edge servers and non-standby replicas, but ensures other replica types and edge servers can generate checkpoints to a location that is backed up and has plenty of storage capacity. For standby replicas only (which cannot be filtered), the journalPrefix remains /p4/N/journals.rep on the /hxlogs volume. |
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| #1 | 21072 | tom_tyler | Added mkrep.sh command summary. |