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