Date: Sun, 22 Jan 2017 20:12:27 +0100 From: Tobias Oberstein <tobias.oberstein@gmail.com> To: Daryl Richards <daryl@isletech.net>, freebsd-fs@freebsd.org Subject: Re: stuck on low scrub performance Message-ID: <4215534c-c249-beb2-e210-a5d31b0ac645@gmail.com> In-Reply-To: <91c33947-bddc-014e-676d-2a5c3950bb71@isletech.net> References: <b0dc09d8-3579-f7c0-f72a-3e2ce798f443@gmail.com> <8b408926-768b-8df9-e38c-b617cce30b16@gmail.com> <91c33947-bddc-014e-676d-2a5c3950bb71@isletech.net>
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>> Note: the pool consists of 4 disk sets (striped) with 6 disks each >> (RAID-Z2). > Also, FWIW, I also find a scrub starts very slow for the first couple > hours, then speeds up drastically. I also only have ~20TB so perhaps > this scales? I am wondering about this too, eg how large can one make a _single_ zpool? Say I create a single zpool of N x 6 disks, where each 6er set is a RAID-Z2. Currently, I have N=4 (with 6TB SAS disks) .. and seems works very well. Will it work as well with N=16? Assuming I have enough SAS bandwidth of course .. Oracle ZFS Storage ZS5-4 maxes out at 9PB. Anyone knows about the zpool layout of this baby? Cheers, /Tobias
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