Date: Thu, 12 May 2011 09:58:04 +0100 From: krad <kraduk@gmail.com> To: =?UTF-8?Q?=C5=A0imun_Mikecin?= <numisemis@gmail.com> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS: How to enable cache and logs. Message-ID: <BANLkTikfAKYVm=EtVXVy8kPCmB=AOKjgLA@mail.gmail.com> In-Reply-To: <A0F4CB3E-1068-4E19-A50F-AA5620A9EB85@gmail.com> References: <4DCA5620.1030203@dannysplace.net> <4DCB455C.4020805@dannysplace.net> <4DCB81B8.6070301@digsys.bg> <A0F4CB3E-1068-4E19-A50F-AA5620A9EB85@gmail.com>
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2011/5/12 =C5=A0imun Mikecin <numisemis@gmail.com> > > On 12. svi. 2011., at 08:44, Daniel Kalchev wrote: > > > On 12.05.11 05:26, Danny Carroll wrote: > >> > >> - Don't use SSD for the Log device. Write speed tends to be a proble= m. > > It all depends on your usage. You need to experiment, unfortunately. > > What is the alternative for log devices if you are not using SSD? > Rotating hard drives? > > AFAIK, two factors define the speed of log device: write transfer rate an= d > write latency. > You will not find a rotating hard drive that has a write latency anything > near the write latency of even a slowest SSD you can find on the market. > On the other hand, only a very few rotating hard drives have a write > transfer rate that can be compared to SSD's. > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > ive seen an interesting article using 2x ram disks on two separate computer= s (UPS backed) shared out via iscsi over a high speed network. It had very successful results. Sounds a bit brave in a production environment to me though
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