From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mondschein.lichtvoll.de ([194.150.191.11]:59976 "EHLO mail.lichtvoll.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758147Ab3EYWrD convert rfc822-to-8bit (ORCPT ); Sat, 25 May 2013 18:47:03 -0400 From: Martin Steigerwald To: Duncan <1i5t5.duncan@cox.net> Cc: linux-btrfs@vger.kernel.org Subject: Re: Recommended settings for SSD Date: Sun, 26 May 2013 00:46:56 +0200 Message-ID: <6555447.0nnTVXRBLE@merkaba> In-Reply-To: <1751895.r3q1HmeO0C@merkaba> References: <1751895.r3q1HmeO0C@merkaba> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Am Samstag, 25. Mai 2013, 14:13:07 schrieb Martin Steigerwald: > The SSD is in use for about 2 years. I left about 25 GiB free of the 300 GB it > has. > > merkaba:~> smartctl -a /dev/sda | grep Host > 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always > - 261260 > 227 Workld_Host_Reads_Perc 0x0032 100 100 000 Old_age Always > - 49 > 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always > - 261260 > 242 Host_Reads_32MiB 0x0032 100 100 000 Old_age Always > - 559520 > > So thats 261260 * 32 MiB = 8360320 MiB = 8164,375 GiB = about 8 TiB writes in > total. > > Intel claims a useful life of 5 years with 20 GB of host writes per day. For 2 > years thats 365*20 = 7300 GB. So it seems that I am exceeding this a bit. > > Strange, last time I looked it was way under the specified limit. KDE Nepomuk / > Akonadi stuff? Switch of /home to BTRFS? I donīt know. What I know that Akonadi > / KDEPIM has gone wild once and wrote 450 GB in a row until I stopped it doing > that manually. Well, all is well: I just calculated for one year. But the SSD is two years old. That makes: 365*2*20 = 14600 GB. About 8 TiB is way below it :) -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7