Date: Wed, 21 Nov 2012 13:11:40 +1030 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: bsd <bsd@todoo.biz> Cc: Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: SSD for FreeBSD NAS device Message-ID: <50AC3F64.8060709@ShaneWare.Biz> In-Reply-To: <B9D92EF1-9A67-469F-A54B-7A9CD2C6B9F8@todoo.biz> References: <B9D92EF1-9A67-469F-A54B-7A9CD2C6B9F8@todoo.biz>
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On 20/11/2012 20:54, bsd wrote: > Hello, > > I have just acquired an Intel R2312GZ4GC4 which I have equipped with > a Adaptec RAID 51245 and 6 WD red disks of 3To - It'll come with > 32Gb of Kingston ECC RAM. > > I am planing to use It as a backup device on a second hosting > facility to backup couple of critical servers of mine. > Do you think I should go for a redundant SSD drives (RAID 1) or does > this offers limited interest in such config ? The advantage of SSD drives is their speed, in a ZFS config they can help most in two ways, as cache devices to speed up disk access or as log devices to increase reliability. Personally for a backup server I would use the two SSD drives as a mirrored log device for the ZFS pool. Reliability over performance. Having said that if you haven't got them I wouldn't get them. For a busy fileserver in the office you want the extra performance. As an offsite backup server the time saved in performance is only going to impact a few times a day and will be outweighed by the network speed. The cost of the SSD drives could add more drives to increase space or redundancy - RAIDZ3 ?
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