From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from know-smtprelay-omc-11.server.virginmedia.net ([80.0.253.75]:52501 "EHLO know-smtprelay-omc-11.server.virginmedia.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751921AbcCLNBU (ORCPT ); Sat, 12 Mar 2016 08:01:20 -0500 Received: from phoenix.vfire (localhost [127.0.0.1]) by phoenix.vfire (8.14.9/8.14.5) with ESMTP id u2CD1HjW022215 for ; Sat, 12 Mar 2016 13:01:17 GMT Received: (from pete@localhost) by phoenix.vfire (8.14.9/8.14.5/Submit) id u2CD1HCC022214 for linux-btrfs@vger.kernel.org; Sat, 12 Mar 2016 13:01:17 GMT Date: Sat, 12 Mar 2016 13:01:17 GMT Message-Id: <201603121301.u2CD1HCC022214@phoenix.vfire> From: pete@petezilla.co.uk To: linux-btrfs@vger.kernel.org Subject: Re: Snapshots slowing system In-Reply-To: loom.20160312T002538-774@post.gmane.org Sender: linux-btrfs-owner@vger.kernel.org List-ID: I hope this message stays within the thread on the list. I had email problems and ended up hacking around with sendmail & grabbing the message id off of the web based group archives. >I wondered whether you had elimated fragmentation, or any other known gotchas, >as a cause? Subvolumes are mounted with the following options: autodefrag,relatime,compress=lzo,subvol= Not sure if there is much else to do about fragmentation apart from running a balance which would probally make thje machine v sluggish for a day or so. >Out of curiosity, what is/was the utilisation of the disk? Were the snapshots >read-only or read-write? root@phoenix:~# btrfs fi df / Data, single: total=101.03GiB, used=97.91GiB System, single: total=32.00MiB, used=16.00KiB Metadata, single: total=8.00GiB, used=5.29GiB GlobalReserve, single: total=512.00MiB, used=0.00B root@phoenix:~# btrfs fi df /home Data, RAID1: total=1.99TiB, used=1.97TiB System, RAID1: total=32.00MiB, used=352.00KiB Metadata, RAID1: total=53.00GiB, used=50.22GiB GlobalReserve, single: total=512.00MiB, used=0.00B Hmm. The system disk is getting a little tight. cddisk reports the partition I use for btrfs containing root as 127GB approx. Not sure why it grows so much. Suspect that software updates can't help as snapshots will contain the legacy versions. On the other hand they can be useful. Is it likely the SSD? If likely I could get a larger one, now is a good time with a new version of slackware imminent. However, no point in spending money for the sake of it. All snapshots read-write. However, I have mainly treated them as read-only. Does that make a difference? >Apropos Nada: quick shout out to Qu to wish him luck for the 4.6 merge. I'm wondering if it is time for an update from 4.0.4? >[Also, damn you autocorrection on my phone!] Yep! -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html