Date: Tue, 13 Mar 2001 14:28:03 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: <scsi@FreeBSD.ORG>, <fs@FreeBSD.ORG> Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <Pine.BSF.4.32.0103131405190.52535-100000@mail.wolves.k12.mo.us> In-Reply-To: <8821.984501490@critter>
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CCs trimmed... On Tue, 13 Mar 2001, Poul-Henning Kamp wrote: > > >If NT and FreeBSD both support hinting of metadata writes, it's only a > >matter of time before the hardware support appears. > > I have been looking for a long time for a PCI NVRAM card at a > reasonable cost, anyone know of any with a reasonable price ? How "non-volatile" do you want it to be? I realize truly non-volatile means "forever" (i.e. Flash EEPROM, MRAM, or similar). However, a few minutes/hours (battery-backed volatile RAM) might be enough? The relatively cheap Mylex AcceleRAID 170 we just recently purchased has a "super-cap" (a very high-capacity capacitor, but not exactly a battery) on it, which could theoretically supply power to the on-board cache for at least a few minutes. The documentation and spec sheets for the board mention absolutely nothing about it, but its there. The low-profile version of the board doesn't appear to have the "super-cap", though. I've also got an AMI MegaRAID Enterprise 1200 at home with the small Ni-Cad battery backup module, and it should be able to keep the memory alive for at least a few hours. I think all of AMI's Enterprise level controllers offer that option. -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net FreeBSD: The fastest and most stable server OS on the planet. For IA32 and Alpha architectures. IA64, PPC, and ARM under development. http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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