Hello,
Has anyone encountered serious performance degradation when 'vfast' is
switched on? The manual claims it does its work without much impact, but
that's not what I experience.
-> On an XP1000, switching it on for the usr_domain (8 GB SCSI, 80% full)
eats 99% system time, virtually grinding the machine to a halt. I left
it running for 10 hours overnight, but it had still not finished or
entered regime.
-> On an DS20E, it saturates a HSG80 (170 GB SAN, 80% full), consuming 50%
system time (one of the two CPU's for 100%, I guess). Performance is
badly degraded, NFS is terrible; setting the "Percent IOs Allocated to
vfast When System Busy" to 0 (default is 1), seems to have no impact at
all.
This is on 5.1B PK3.
Am I the odd one out, or is 'vfast' really not ready for production?
Greetings, Bert.
--
------------ eMail Bert.Deknuydt(at)esat.kuleuven.ac.be --------------
B.DeKnuydt, PSI-KULeuven Tel. +32-16-321880
Kasteelpark Arenberg 10 /| | ||
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FLANDERS, BELGIUM / . Fax. +32-16-321838
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Received on Fri Nov 14 2003 - 15:00:13 NZDT