thats not a typo... I was thinking 2 pools, 800gb each, and mirrored... think i should mess around with this setup a bit more and see what i can get working... might work better if i just move them into a new enclosure... we see what happens...
Thanks for the info on the USB drives... if the ZIL drive falls over, does ZFS not recover well? do i need to reboot fully? Thanks. --Tienan On Sat, Jul 16, 2011 at 3:23 PM, Jim Klimov <jimkli...@cos.ru> wrote: > 2011-07-16 15:46, Tiernan OToole пишет: > > Thanks for the info. need to rebuild my machine and ZFS pool.... kind of > new to this and realized i built it as a stripe, not a mirror... also, want > to add extra disks... > > As a follow up question: > > I have 2 500Gb internal drives and 2 300Gb USB drives. If i where to > create a 2 pools, a 300Gb and a 500Gb in each, and then mirror over them, > would that work? is it even posible? or what would you recomend for that > setup? > > Is there a typo? It would rather be a 2*300Gb mirror and a 2*500Gb > mirror, > with a "stripe" above them as much as writes can get balanced. > > That would work (with forcing on command-line), is possible, moderately > recommmended because unbalanced setups can have more issues than > usual (hence you must use the force to enable such setup). > > And just in case, this pool can not be a bootable rpool. > > You might make a 2*200Gb slice mirror for an rpool and a more balanced > 4*300Gb pool of any layout (raid10, raidz123)... > > As for using USB sticks, I started my unlucky setup with some sticks used > as L2ARC, and about once a week the device got lost (possibly because > a stick could slide a bit from its contact bay on the chassis - BIOS also > did > not see the stick until it was re-plugged). Loss of a device would also > hang > my pool for quite a long while... > > Thanks. > > --Tiernan > > On Fri, Jul 15, 2011 at 5:39 PM, Edward Ned Harvey < > opensolarisisdeadlongliveopensola...@nedharvey.com> wrote: > >> > From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- >> > boun...@opensolaris.org] On Behalf Of Tiernan OToole >> > >> > This might be a stupid question, but here goes... Would adding, say, 4 4 >> or >> > 8gb usb keys as a zil make enough of a difference for writes on an iscsi >> shared >> > vol? >> > >> > I am finding reads are not too bad (40is mb/s over gige on 2 500gb >> drives >> > stripped) but writes top out at about 10 and drop a lot lower... If I >> where to >> > add a couple usb keys for zil, would it make a difference? >> >> Unfortunately, usb keys, even the fastest ones, are slower than physical >> hard drives. I even went out of my way to buy a super expensive super >> fast >> USB3 16G fob... And it's still slower than a super-cheap USB2 sata hard >> drive. >> >> There is a way you can evaluate the effect of adding a fast slog device >> without buying one. (It would have to be a fast device, certainly no USB >> fobs.) Just temporarily disable your ZIL. That's the fastest you can >> possibly go. If it makes a big difference, then getting a fast slog >> device >> will help you approach that theoretical limit. If it doesn't make a huge >> difference, then adding slog will not do you any good. >> >> To disable ZIL, if your pool is sufficiently recent, use the zfs set sync= >> command. It takes effect immediately. If you have an older system, >> you'll >> have to use a different command, and you'll probably have to remount your >> filesystem in order for the change to take effect. >> >> > > > -- > Tiernan O'Toole > blog.lotas-smartman.net > www.tiernanotoolephotography.com > www.the-hairy-one.com > > > _______________________________________________ > zfs-discuss mailing > listzfs-discuss@opensolaris.orghttp://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > > > -- > > > +============================================================+ > | | > | Климов Евгений, Jim Klimov | > | технический директор CTO | > | ЗАО "ЦОС и ВТ" JSC COS&HT | > | | > | +7-903-7705859 (cellular) mailto:jimkli...@cos.ru > <jimkli...@cos.ru> | > | CC:ad...@cos.ru,jimkli...@mail.ru | > +============================================================+ > | () ascii ribbon campaign - against html mail | > | /\ - against microsoft attachments | > +============================================================+ > > > > > _______________________________________________ > 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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