Date: Wed, 3 Aug 2016 21:49:26 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: freebsd-questions@freebsd.org Subject: Re: Ominous smartd messages .... Message-ID: <92733556-2fb1-08dc-ac7a-c54d0247c7ae@holgerdanske.com> In-Reply-To: <e622244a-7836-068d-0554-1898689531a4@hiwaay.net> References: <e5a65f8a-27a0-65e7-42db-28bef824e0c0@hiwaay.net> <020caa94-b329-d5a6-5bd4-bfcc575c039f@freebsd.org> <b20550ac-1637-07d4-20dc-7cdc3a5173a9@hiwaay.net> <4b35b969-606b-9084-5ce3-688eddfc5e70@FreeBSD.org> <e622244a-7836-068d-0554-1898689531a4@hiwaay.net>
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On 08/03/2016 01:27 PM, William A. Mahaffey III wrote: > Can I do that 'zpool scrub' live ? I try to scrub when the machine is not in use. > No spare SATA slots :-/ .... How about expansion slots -- e.g. PCI, PCIe? > On 08/03/16 15:19, Matthew Seaman wrote: >> Also, the fact that you have how ever many terabytes of data with no >> resilience just makes me feel on edge -- and it's not even my data. +1 >> Strongly recommend rebuilding your zpool as a RAIDZ of 8 drives -- yes, >> you'll end up with less usable space, but you and your data will survive >> failure of a drive and a 'zpool scrub' will be able to fix things even >> if a bad spot on one drive has scrambled some of your data. > > I was/am already thinking along those lines, w/ 1 complication. I have > another box (NetBSD 6.1.5) w/ a RAID5 that I wound up building w/ > mis-aligned disk/RAID blocks in spite of a fair amount of effort to > avoid that. I/O writes are horrible, 15-20 MB/s. My understanding is > that RAIDZn is like RAID5 in many ways & that you always want 2^n+1 > (3,5,9, ...) drives in a RAID5 to mitigate those misalignments, > presumably in a RAIDZ also. Is that so w/ RAIDZ as well ? If so, I lose > more than a small amount of total storage, which is why I went as I did > when I built the box whenever that was. How much data do you have on the 8 @ 1 TB machine? How are you doing backups? Archives? Images? How much data are you willing to lose? What is your usage environment -- e.g. student/ hobbyist, SOHO, SMB, large corporate? What are your budget and schedule? David
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