If using two mirrors, you'll end up with a badly balanced pool. As it was, and
possibly is, this will lead to a performance penalty when one VDEV is full (the
300GB VDEV). This write performance has reportedly been fixed in Illumos, but I
don't know about S11ex. For OpenIndiana/Nexenta, the fix probably isn't in yet.
roy ----- Original Message -----
> Ok, so, taking 2 300Gb disks, and 2 500Gb disks, and creating an 800Gb
> mirrored striped thing is sounding like a bad idea... what about just
> creating a pool of all disks, without using mirrors? I seen something
> called "copies", which if i am reading correctly, will make sure a
> number of copies of a file exist... Am i reading that correctly? If
> this does work the way i think it works, then taking all 4 disks, and
> making one large 1.6Tb pool, setting copies to 2, should, in theory,
> create a poor mans pool with striping, right?
> --Tiernan
> On Mon, Jul 18, 2011 at 7:20 AM, Brandon High < bh...@freaks.com >
> wrote:
> > On Sun, Jul 17, 2011 at 12:13 PM, Edward Ned Harvey
> > < opensolarisisdeadlongliveopensola...@nedharvey.com > wrote:
> > > Actually, you can't do that. You can't make a vdev from other
> > > vdev's, and when it comes to striping and mirroring your only
> > > choice
> > > is to do it the right way.
> > >
> > > If you were REALLY trying to go out of your way to do it wrong
> > > somehow, I suppose you could probably make a zvol from a stripe,
> > > and
> > > then export it to yourself via iscsi, repeat with another zvol,
> > > and
> > > then mirror the two iscsi targets. ;-) You might even be able to
> > > do
> > > the same crazy thing with simply zvol's and no iscsi... But either
> > > way you'd really be going out of your way to create a problem. ;-)
> > The right way to do it, um, incorrectly is to create a striped
> > device
> > using SVM, and use that as a vdev for your pool.
> > So yes, you could create two 800GB stripes, and use them to create a
> > ZFS mirror. But it would be a really bad idea.
> > -B
> > --
> > Brandon High : bh...@freaks.com
> > _______________________________________________
> > zfs-discuss mailing list
> > zfs-discuss@opensolaris.org
> > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
> --
> Tiernan O'Toole
> blog.lotas-smartman.net
> www.tiernanotoolephotography.com
> www.the-hairy-one.com
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-- Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685
r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det
essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ
for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed
opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer
på norsk.
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