Re: NFS vs. md raid
"Stephen John Smoogen" <[email protected]>
| Newsgroups | gmane.linux.redhat.release.taroon.general |
|---|---|
| Message-ID | <[email protected]> |
On 6/8/06, Christopher McCrory <[email protected]> wrote: > Hello... > > speaking of NFS... > > I've continually had slow write performance ( specifically file > creation) with RHEL3 when the NFS server filesystem is a software raid > device. THe same thing happens with RHEL4. When using a single drive > as an export, performance is fast. So far the only option I have found > that helps is exporting with the 'async' option. All clients are also > RHEL Well a lot of questions can affect this: 1) What kind of disk controller 2) What kind of disk drives? 3) What kind of RAID? 4) What kind of NFS? > > example: > time tar -xzf lots.of.files.tar.gz > > local drive: > real 0m6.053s > user 0m2.210s > sys 0m1.180s > > nfs with async (insane) > real 0m6.492s > user 0m2.150s > sys 0m1.140s > > nfs with sync (sane) > real 1m52.756s > user 0m2.430s > sys 0m1.290s > > > 6 seconds vs. 120 seconds. Ouch > > Any ideas? > > > -- > Christopher McCrory > "The guy that keeps the servers running" > > [email protected] > http://www.pricegrabber.com > > Let's face it, there's no Hollow Earth, no robots, and > no 'mute rays.' And even if there were, waxed paper is > no defense. I tried it. Only tinfoil works. > > -- > Taroon-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/taroon-list > -- Stephen J Smoogen. CSIRT/Linux System Administrator -- Taroon-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/taroon-list