Unit of measure?

[lisa]

Can someone tell me what unit of measure the LMT stats on disk IO are
reported in?

Thanks!

lisa

[Andrew Uselton]

short answer: probably MB/s

long answer:

There are a lot of different stats stored in the database. Are you looking at the data produced by the gui, the command line tool, or directly in the DB? The OST_DATA table, for instance, has counters (non-decreasing 64-bit integers) that record how many bytes have been read or written since the last reboot of a given OST/OSS. Those are measured in bytes. The data is collected every five seconds. Some of the tools take the difference from one observation to the next and divide by the interval to get a rate. Then the rate might be displayed in MB/s instead of bytes/s. It depends on which tool you are looking at.

Cheers,

Andrew

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[lisa]

There are two places I am looking. The first is the read/write
throughput listed in lwatch. And the second is the data for the OST's
right in the
database. In particular the OST_AGGREGATE_HOUR.

lisa


On 1/6/11 11

On Jan 6, 11:53 am, Andrew Uselton <andrew.usel...@gmail.com> wrote:
> short answer: probably MB/s
>
> long answer:
> There are a lot of different stats stored in the database. Are you looking
> at the data produced by the gui, the command line tool, or directly in the
> DB? The OST_DATA table, for instance, has counters (non-decreasing 64-bit
> integers) that record how many bytes have been read or written since the
> last reboot of a given OST/OSS. Those are measured in bytes. The data is
> collected every five seconds. Some of the tools take the difference from one
> observation to the next and divide by the interval to get a rate. Then the
> rate might be displayed in MB/s instead of bytes/s. It depends on which tool
> you are looking at.
> Cheers,
> Andrew
>

> On Thu, Jan 6, 2011 at 7:06 AM, lisa <lagiacche...@gmail.com> wrote:
> > Can someone tell me what unit of measure the LMT stats on disk IO are
> > reported in?
>
> > Thanks!
>
> > lisa
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "lmt-discuss" group.
> > To post to this group, send email to lmt-d...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > lmt-discuss...@googlegroups.com<lmt-discuss%2Bunsu...@googlegroups.com>
> > .

[Andrew Uselton]

I'd have to go through the source code to be sure, but I think lwatch reports MB/s and OST_AGGREGATE_HOUR is going to be in bytes. I don't actually use either of these, so my confidence is low :)

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