Thanks Nathan, I want to test the underlying performance, of course the problem is I want to test the 16 or so disks in the stripe, rather than individual devices.
Thanks Rob On 28/01/2009 22:23, "Nathan Kroenert" <nathan.kroen...@sun.com> wrote: > Also - My experience with a very small ARC is that your performance will > stink. ZFS is an advanced filesystem that IMO makes some assumptions > about capability and capacity of current hardware. If you don't give > what it's expecting, your results may be equally unexpected. > > If you are keen to test the *actual* disk performance, you should just > use the underlying disk device like /dev/rdsk/c0t0d0s0 > > Beware, however, that any writes to these devices will indeed result in > the loss of the data on those devices, zpools or other. > > Cheers. > > Nathan. > > Richard Elling wrote: >> > Rob Brown wrote: >>> >> Afternoon, >>> >> >>> >> In order to test my storage I want to stop the cacheing effect of the >>> >> ARC on a ZFS filesystem. I can do similar on UFS by mounting it with >>> >> the directio flag. >> > >> > No, not really the same concept, which is why Roch wrote >> > http://blogs.sun.com/roch/entry/zfs_and_directio >> > >>> >> I saw the following two options on a nevada box which presumably >>> >> control it: >>> >> >>> >> primarycache >>> >> secondarycache >> > >> > Yes, to some degree this offers some capability. But I don't believe >> > they are in any release of Solaris 10. >> > -- richard >> > >>> >> But I¹m running Solaris 10U4 which doesn¹t have them -can I disable it? >>> >> >>> >> Many thanks >>> >> >>> >> Rob >>> >> >>> >> >>> >> >>> >> >>> >> *|* *Robert Brown - **ioko *Professional Services *| >>> >> | **Mobile:* +44 (0)7769 711 885 *| >>> >> * >>> >> ------------------------------------------------------------------------ >>> >> >>> >> _______________________________________________ >>> >> zfs-discuss mailing list >>> >> zfs-discuss@opensolaris.org >>> >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >>> >> >> > >> > _______________________________________________ >> > zfs-discuss mailing list >> > zfs-discuss@opensolaris.org >> > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > -- > ////////////////////////////////////////////////////////////////// > // Nathan Kroenert nathan.kroen...@sun.com // > // Systems Engineer Phone: +61 3 9869-6255 // > // Sun Microsystems Fax: +61 3 9869-6288 // > // Level 7, 476 St. Kilda Road Mobile: 0419 305 456 // > // Melbourne 3004 Victoria Australia // > ////////////////////////////////////////////////////////////////// > | Robert Brown - ioko Professional Services | | Mobile: +44 (0)7769 711 885 |
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