| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1056.1 | | KITCHE::schott | Eric R. Schott USG Product Management | Mon May 05 1997 21:44 | 39 |
| >
>A couple of questions,
>
>Veritas (www.veritas.com), works with SUN to provide there "ADVFS"
>solution. Veritas is now offering a way to go direct I/O bypassing the
>buffer cache while still using a file system. Can we or will we do this
>with Advfs?
Part of the plan for steel.
>
>Does Advfs do sync or async I/O? I believe it is async, if true, can
>Advfs be set up to due sync writes?
Open with F_SYNC option...you can do aio to advfs also, but it
uses threads currently...
>
>Any tuning tips from a benchmark that will
>1)read in a 1GB file
>2)perform a sort
>3)then write a 100 to 200 GB file to disk
>4)repeat steps 2-3 50 times
>
>I am working with a consultant who would like to see Alpha's win the bid
>over Sun/EMC. He wins either way.
What kind of storage are you planning to use...the EMC box will
most likely have 1GB of cache, so this may help a lot with hiding
some of the I/O.
Is this a custom written app? What kind of machine?
>
>Tom Cox
>dtn 238-4305
>coxt@mail.dec.com
>
>
|
| 1056.2 | HSZ50's with 128mb cache? | NQOS01::16.132.96.94::coxt | | Tue May 06 1997 10:22 | 12 |
| Thanks for the first 2 answers.
I am not sure of the EMC config, but I'am sure it will have a lot of
cache.
For the benchmark, I plan on a pair of HSZ50's with 128MB of cache. The
customer requested a single RAID5 array of at least 8GB for the
benchmark.
I am thinking of using 6 spindles, either RZ28 or RZ29's to use all of
the HSZ50's channels.
|
| 1056.3 | | SMURF::SCHANK | | Tue May 06 1997 11:05 | 3 |
| Direct I/O will be available in AdvFS in the next release (steelos).
All direct I/O writes are sync unless the kernel AIO interface is used.
|
| 1056.4 | chfile -l on | NNTPD::"tmark@zk3.dec.com" | Tim Mark | Tue May 06 1997 13:31 | 4 |
| As of 4.0D (PTmin), files which have had "chfile -l on" run on them will
do ALL of their I/O in synchronous fashion until "chfile -l off" is run on
them. This is regardless of what flags were used by the open() system call.
[Posted by WWW Notes gateway]
|