Hi Group - 1st time post, looks like just use the email address I have seen from other posts If the setup/info/questions below are not suitable for this list, is there another xfs list available for these?? Thanks mike Configuration – - RH 6.4 on HP G8 server w/16GB mem (could add a lot more) - 12Gb SAS connections (2) to storage - Storage - 96 LFF HDD’s (4TB 7K NLSAS) presently organized as 8 x 10+2 R6 raidsets - 8 volumes mapped to host ports (MPIO engaged) - Mdadm used to stripe (/dev/dm*) LUNs into a single md device (approx. 300+TB file system space) - Mkfs.xfs used to lay down file system - - Workload - Application creates file of specified length in dir of mount point, IO’s then issued to file(s), each file receives 1 stream of IO - 1 x high speed stream 1000MB/s Seq W (IO’s arrive as 512KB -=> 4MB frame would be 8 x 512KB IO’s) - 2 x med-speed streams 200MB/s Seq W “ - 30-50 low speed streams 10MB/s Seq W “ Objectives/Questions – - Would like to optimize xfs/mount parameters to make maximal use of storage assets - Thinking of using 15K HDD R1 set for log files – would this get all/most of metadata or just a subset? Right now seeing metadata writes arriving with data writes and want to peel them off the 7K HDD’s - Would using sub-directories for each file ensure that each subdir/file would be in it’s own alloc group? And that would keep the streaming data in a separate AG – could help the storage more efficiently destage the writes from cache to disk |
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