Date: Sun, 16 Dec 2007 13:51:15 -0600 (CST) From: matt@layeredtech.com To: freebsd-current@freebsd.org Subject: Re: ZFS melting under postgres... Message-ID: <42042.76.209.125.244.1197834675.squirrel@mail.layeredtech.com> In-Reply-To: <86r6hmsnew.fsf@ds4.des.no> References: <47606C09.2070209@isc.org> <47609F0A.7010805@clearchain.com> <47609FE3.8040606@barafranca.com> <4760B444.1080604@clearchain.com> <06CAC7FC-DB58-441D-A6E0-76D1D8133393@tamu.edu> <86ir31xwlu.fsf@ds4.des.no> <ADCCD5E6-A792-49B9-A346-753176C12F2E@tamu.edu> <fjuljp$cvb$1@ger.gmane.org> <476343B4.8080208@FreeBSD.org> <fk09p8$b16$1@ger.gmane.org> <86tzmk54tt.fsf@ds4.des.no> <fk0ue7$bp$1@ger.gmane.org> <86r6hmsnew.fsf@ds4.des.no>
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> Ivan Voras <ivoras@freebsd.org> writes: >> These are all "normal" CompactFlash cards, for which the widely >> available size seems to be 16 GB max, right? > > So? That's more than enough for a ZFS intent log (as a rule of thumb, > the ZIL should be half the size of the server's RAM). > >> Did you (or anyone) deploy CF drives for production servers? > > My router (and DNS, NTP and DHCP server) is a net4801 with a 1 GB CF > chip. > > DES Some folks are fond of having a fast boot disk with practically no latency and no moving parts. I run quite a few production servers on CF drives in a very large (12k+ servers) data center environment. In nearly every case, the CF card is the systems root (/) partition and is always mounted read-only. In some cases where we use CF, the systems also have a SAS/SATA disk for maintenance. When needed, we can spin up the SAS/SATA disk. On that hard drive, we keep a history of the CF card images and other maintenance items like /usr/ports and /usr/src. We use ATA CF adapters that I buy off eBay for $1.98 each. They ship direct from Hong Kong and work great.
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