Re: U320 Large Array Performance

["Rick Smith" <rgsmith72@xxxxxxxxxxx>]

Steve,
	Here is the data you requested. By the way, I experimented with agsize as 
you suggested and it didn't have any affect. In fact (as you probably know), 
the tool mkfs.xfs produces a warning when agsize is a multiple of stripe 
size.
Output sampling of 4 files written in succession with 14 disks (excellent 
performance):
test.459.data:
EXT: FILE-OFFSET      BLOCK-RANGE       AG AG-OFFSET          TOTAL
  0: [0..16199]:      7436152..7452351   0 (7436152..7452351) 16200
test.460.data:
EXT: FILE-OFFSET      BLOCK-RANGE       AG AG-OFFSET          TOTAL
  0: [0..16199]:      7452352..7468551   0 (7452352..7468551) 16200
test.461.data:
EXT: FILE-OFFSET      BLOCK-RANGE       AG AG-OFFSET          TOTAL
  0: [0..16199]:      7468552..7484751   0 (7468552..7484751) 16200
test.462.data:
EXT: FILE-OFFSET      BLOCK-RANGE       AG AG-OFFSET          TOTAL
  0: [0..16199]:      7484752..7500951   0 (7484752..7500951) 16200

Output sampling of 4 files written in succession with 15 disks (performance 
drops significantly):
test.459.data:
EXT: FILE-OFFSET      BLOCK-RANGE         AG AG-OFFSET        TOTAL
  0: [0..16199]:      58720320..58736519   7 (64..16263)      16200
test.460.data:
EXT: FILE-OFFSET      BLOCK-RANGE         AG AG-OFFSET        TOTAL
  0: [0..16199]:      67108928..67125127   8 (64..16263)      16200
test.461.data:
EXT: FILE-OFFSET      BLOCK-RANGE         AG AG-OFFSET        TOTAL
  0: [0..16199]:      75497536..75513735   9 (64..16263)      16200
test.462.data:
EXT: FILE-OFFSET      BLOCK-RANGE         AG AG-OFFSET        TOTAL
  0: [0..16199]:      83886144..83902343  10 (64..16263)

Thanks for your help.

Rick

> From: Steve Lord <lord@xxxxxxx>
> To: Rick Smith <rgsmith72@xxxxxxxxxxx>
> CC: linux-xfs@xxxxxxxxxxx
> Subject: Re: U320 Large Array Performance
> Date: 05 Feb 2003 12:02:08 -0600
>
> On Tue, 2003-02-04 at 16:47, Rick Smith wrote:
> > Steve,
> > 	Here is the output from xfs_info, please excuse the formatting. I am 
> using
> > a chunk size of 4K in the raid. Larger sizes seem to degrade 
> performance.
> > Thanks for your help.
> >
>
> Can you do one more thing for me, with these configurations send me the
> xfs_bmap -v output for a file on each filesystem.
>
> Thanks,
>
> Steve
>
> --
>
> Steve Lord                                      voice: +1-651-683-3511
> Principal Engineer, Filesystem Software         email: lord@xxxxxxx

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