Date: Fri, 27 Nov 2015 17:21:58 +0100 From: InterNetX - Juergen Gotteswinter <jg@internetx.com> To: Kai Gallasch <k@free.de>, freebsd-fs@freebsd.org Subject: Re: High fragmentation on zpool log Message-ID: <56588326.8050800@internetx.com> In-Reply-To: <5658824D.6070800@free.de> References: <565875A7.6060004@free.de> <56587B83.9020506@internetx.com> <5658824D.6070800@free.de>
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Am 27.11.2015 um 17:18 schrieb Kai Gallasch: > On 27.11.2015 16:49 InterNetX - Juergen Gotteswinter wrote: >> Your SSDS are not really attached as Zil ? > > Sorry. Due to copying&pasting a condensed version of zpool list -v, I > forgot to paste a line.. so this is the corrected version: > > Sorry, > Kai. > :) i think this is caused by the size of your Zil, dunno if its really something to care about ( i whould not worry about). More problematic (regarding SSD Lifetime) is the dual use of SSD for ZIL / L2. Your Flash Drives get hammered with writes from 2 Sides. Write Caching, and L2 Feed ing. > > (zpool list -v output, ommited columns: EXPANDSZ.,DEDUP, > HEALTH, ALTROOT) > > NAME SIZE ALLOC FREE FRAG CAP > rpool 7.25T 440G 6.82T 4% 5% > mirror 1.81T 110G 1.71T 4% 5% > gpt/rpool-WMC160D0SVZE - - - - - > gpt/rpool-WMC160D8MJPD - - - - - > mirror 1.81T 110G 1.70T 4% 5% > gpt/rpool-WMC160D9DLL2 - - - - - > gpt/rpool-WMC160D23CWA - - - - - > mirror 1.81T 110G 1.71T 4% 5% > gpt/rpool-WMC160D94930 - - - - - > gpt/rpool-WMC160D9V5LW - - - - - > mirror 1.81T 110G 1.71T 4% 5% > gpt/rpool-WMC160D9ZV0S - - - - - > gpt/rpool-WMC160D5HFT6 - - - - - > logs > mirror 7.94G 43.2M 7.90G 85% 0% > gpt/log-BTTV523401U4100FGN - - - - - > gpt/log-BTTV5234003K100FGN - - - - - > cache - - - - - > gpt/cache-BTTV5234003K100FGN 85.2G 142G 16.0E 0% 166% > gpt/cache-BTTV523401U4100FGN 85.2G 172G 16.0E 0% 202% > > > > >
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