Frank Schwede, LSY wrote:
Im sorry, but:
What is going on here?
I was sure, someone would give a statement about the real current state of PAV on
Escon DASDs.
Maybe others were puzzled like myself. Why the $* would you pay for PAV
license on the ESS and not invest in FICON? When all response
]
-Ursprüngliche Nachricht-
Von: Linux on 390 Port [mailto:[EMAIL PROTECTED] Auftrag von
Rob van der Heij
Gesendet: Dienstag, 20. Juli 2004 09:09
An: [EMAIL PROTECTED]
Betreff: Re: WG: Performance of large file systems
Frank Schwede, LSY wrote:
Im sorry, but:
What is going on here?
I
Frank Schwede, LSY wrote:
Now Im puzzled,
I wasnt aware of the fact you have to pay for an PAV license.
I didnt read the whole story.
I was sure, that PAV is only an eckd-linux-driver bussiness, wich isnt
developed/released yet.
ianysmg,
but as far as I know, PAV is a licensed feature of the ESS
Frank Schwede, LSY wrote:
I think the performance of an M9 disk isnt important.
We benchmarked striped M3 and M9 pvs, same LVM-layout, had 4 and 8 phys.
escon-channels. Nearly Same perf-values.
If you feel you can get the same amount of bandwidth from a -9 as from a
-3, then that only means that
But we have big performance problems on an 40GB fs
(LVM, 10 Stripes on
M9, 4 phys Escon) with an mySql-DB on it. Reorgs and
even selects
sometimes takes a lot of time. (Same on SCSI-Raid is
double-performance)
Two things:
1) A reorg does both a read and a write, so the
activity of the 4 escon
Aren't the DASDs virtual in the storage boxes??
Tracks are living
anywhere!?
That may be true for the RVA, which is a log
structured array (paging) device that maps a page
anywhere in the backend.
On a shark, each LSS is a separate RAID 5 group and
device addresses are assigned sequentially in
Im sorry, but:
What is going on here?
I was sure, someone would give a statement about the real current state of PAV on
Escon DASDs.
Are there still problems replying to posts?
What I/O performance do you get, and how?
At moment we are creating a concept with a combination of raid-striping
