From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id QB8KKKuRvGFcSQEAgWs5BA (envelope-from ) for ; Fri, 17 Dec 2021 14:33:31 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id 2P7II6uRvGF6SwAAB5/wlQ (envelope-from ) for ; Fri, 17 Dec 2021 13:33:31 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id C81289870 for ; Fri, 17 Dec 2021 14:33:30 +0100 (CET) Received: from localhost ([::1]:45376 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1myDMX-000790-GW for larch@yhetil.org; Fri, 17 Dec 2021 08:33:29 -0500 Received: from eggs.gnu.org ([209.51.188.92]:50470) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1myDKA-0005gW-3T for bug-guix@gnu.org; Fri, 17 Dec 2021 08:31:05 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:54968) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1myDK9-0004Nt-R4 for bug-guix@gnu.org; Fri, 17 Dec 2021 08:31:01 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1myDK9-0003mV-M2 for bug-guix@gnu.org; Fri, 17 Dec 2021 08:31:01 -0500 X-Loop: help-debbugs@gnu.org Subject: bug#51787: GC takes more than 9 hours on berlin Resent-From: Ricardo Wurmus Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Fri, 17 Dec 2021 13:31:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 51787 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Mathieu Othacehe Received: via spool by 51787-submit@debbugs.gnu.org id=B51787.163974784814513 (code B ref 51787); Fri, 17 Dec 2021 13:31:01 +0000 Received: (at 51787) by debbugs.gnu.org; 17 Dec 2021 13:30:48 +0000 Received: from localhost ([127.0.0.1]:38281 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1myDJv-0003m1-TH for submit@debbugs.gnu.org; Fri, 17 Dec 2021 08:30:48 -0500 Received: from sender3-of-o51.zoho.com ([136.143.184.51]:21772) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1myDJt-0003ls-VU for 51787@debbugs.gnu.org; Fri, 17 Dec 2021 08:30:46 -0500 ARC-Seal: i=1; a=rsa-sha256; t=1639747839; cv=none; d=zohomail.com; s=zohoarc; b=c4Roby/W35q0OwiPkK6+O2u+x43X8BQR/3xL7pD7cx1EfTUMsC5xo0xDDOGqtD5PKa9OymJqVNMyR/4nn1FNriqj1gK23MYJ1ALB0DRztqgTDWEbQkEBxqx3erTBOB7x2eswIfu7cLIu1fVGHk9/gpTiage7flVbRLPomh6JpKU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1639747839; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=/SXamSEv7clD/9M9R0Ma/Lyue7wr6H9gbgXwG2ZI7p0=; b=T6yNtx4korOCHT/UB00kaJgCkEu0iub4Tir6OIQDn110rxToD7Jj+M6LYNv3L0N6voTn2NbLTK5VGtiJIBJuBsP/Cc7HgzeUlriRU3srZQPy+jKLlZk0MTVoFZChLiBxarRm35gK4cB1RkI4yNP7GNDcgIDEElT8vij7mmcA/hA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=elephly.net; spf=pass smtp.mailfrom=rekado@elephly.net; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1639747839; s=zoho; d=elephly.net; i=rekado@elephly.net; h=References:From:To:Cc:Subject:Date:In-reply-to:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=/SXamSEv7clD/9M9R0Ma/Lyue7wr6H9gbgXwG2ZI7p0=; b=g+QWkNkozUJk7Z+FvDMBl3OLnETpeGtZkeTBETLWTmd9Wrk7ij85GVpNS0EAaN08 S/d96qTafdKSGpyO7z1gNbJtzQZy8x25HkCAfTIOPT3xqRXv01aWAJPTVfYZn1uoGRm NR51ii0cb2Q7RSk+qoJcqwU+rcuXdlBbctRmrVME= Received: from localhost (p54ad487d.dip0.t-ipconnect.de [84.173.72.125]) by mx.zohomail.com with SMTPS id 1639747836525936.8960152899299; Fri, 17 Dec 2021 05:30:36 -0800 (PST) References: <87o86pegr3.fsf@gnu.org> <87zgpuhig7.fsf@gnu.org> <87wnkv15k3.fsf@cbaines.net> <87zgpp971n.fsf@gnu.org> <87pmqet419.fsf@gnu.org> <87czm57zao.fsf@gnu.org> <87czm4bvzt.fsf@gnu.org> <877dcccrlq.fsf@gnu.org> <87a6h86s7o.fsf@gnu.org> <87bl1nxyt5.fsf@gnu.org> <87o85lhhrd.fsf@gnu.org> <8735mrec0x.fsf@gnu.org> User-agent: mu4e 1.6.10; emacs 28.0.50 From: Ricardo Wurmus Date: Fri, 17 Dec 2021 14:06:51 +0100 In-reply-to: <8735mrec0x.fsf@gnu.org> X-URL: https://elephly.net X-PGP-Key: https://elephly.net/rekado.pubkey X-PGP-Fingerprint: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC Message-ID: <87ilvnjr49.fsf@elephly.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 51787@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1639748010; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:resent-cc: resent-from:resent-sender:resent-message-id:in-reply-to:in-reply-to: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:dkim-signature; bh=/SXamSEv7clD/9M9R0Ma/Lyue7wr6H9gbgXwG2ZI7p0=; b=IY1xd2FFYDYj/1iYqZ5JsvyRxLNxUxMBNI8F3QiD4Za0XTEqzZxoi/xQoW49CZEp231d5b TbiK6mncgFb9wWhe4SAVzfsifE2H5Qb8ysvbnxK5eP8Mw6Fers7DMKQ0WCBQkRc6vhBEBz MtDt1ePiBOGlydM7+Ws+x2jUsILUUfhnU5+FmSeS3aTC+TfvyIY953m7nphtvfDUyBYlTy yBhA2RlUFtbRWg+j3grasArFmMjvaJ/UWQLesUIXeTfbbPXBoR0yHXeIVwg5ufRXmkq1Uh pDibU5AL+l6M1YoAV40hf65yQTRo8cq1+5iSVxprMA9BuhDft71B+zh0lzu6lg== ARC-Seal: i=2; s=key1; d=yhetil.org; t=1639748010; a=rsa-sha256; cv=fail; b=sOxtpiaMqEMbf4bD8gy/mpvjqy9qufi01CdrRZ3GeQsU+Tx4zvsdK/sXzcIRv1Iq2nu2Zp tpqNkof5w6DiCVu+aauWDC/TMIwYRARp0xyQ9htgQxqbMYOwwDHSo0bR7jjJYUE7uxS9/Q Hs1zsjt8qIanFZoRbMRFTt3PP7mm3JjPs2n7FrPn2GjQUeRmtCVSL7hoSymOCjapjX1EAQ bOdvu1zCilY/7cgbU70yavOnn8AZeBrf/mtsvUg1dJzNQFrO1riZI7UiH+TdyzL+1bgo8o dRKiHzJgpBp4fy8HP+Gar9MaNAeP5NtazR4Lbzwa1BKMYOGsw34GpFqIw9XO2Q== ARC-Authentication-Results: i=2; aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=elephly.net header.s=zoho header.b=g+QWkNko; arc=reject ("signature check failed: fail, {[1] = sig:zohomail.com:reject}"); dmarc=none; spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -1.80 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=elephly.net header.s=zoho header.b=g+QWkNko; arc=reject ("signature check failed: fail, {[1] = sig:zohomail.com:reject}"); dmarc=none; spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: C81289870 X-Spam-Score: -1.80 X-Migadu-Scanner: scn0.migadu.com X-TUID: XAsWfLeyr6Fm Hi Mathieu, > New day, new benchmark. Berlin has two hard drives, which are roughly > used this way: > > /dev/sda -> / (916G) > /dev/sdb -> /gnu (37T) sda consists of two local hard disks that are combined to a RAID. Here are the disk details: --8<---------------cut here---------------start------------->8--- Disk.Bay.0:Enclosure.Internal.0-1:RAID.Slot.3-1 Status =3D Ok=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 DeviceDescription =3D Disk 0 in Backplane 1 of RAID Contr= oller in Slot 3 RollupStatus =3D Ok=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 Name =3D Physical Disk 0:1:0=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 State =3D Online=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20 OperationState =3D Not Applicable=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 PowerStatus =3D Spun-Up=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Size =3D 931.000 GB=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 FailurePredicted =3D NO=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 RemainingRatedWriteEndurance =3D Not Applicable=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 SecurityStatus =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 BusProtocol =3D SATA=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 MediaType =3D HDD=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 UsedRaidDiskSpace =3D 931.000 GB=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 AvailableRaidDiskSpace =3D 0.001 GB=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Hotspare =3D NO=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 Manufacturer =3D SEAGATE=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ProductId =3D ST1000NX0443=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Revision =3D NB33=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SerialNumber =3D W470QK7K=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 PartNumber =3D CN08DN1YSGW0076S00L8A00=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20 NegotiatedSpeed =3D 6.0 Gb/s=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ManufacturedDay =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ManufacturedWeek =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ManufacturedYear =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ForeignKeyIdentifier =3D null=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SasAddress =3D 0x4433221106000000=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 FormFactor =3D 2.5 Inch=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 RaidNominalMediumRotationRate =3D 7200=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 T10PICapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 BlockSizeInBytes =3D 512=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 MaxCapableSpeed =3D 6 Gb/s=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20 RaidType =3D None=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SystemEraseCapability =3D CryptographicErasePD=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 SelfEncryptingDriveCapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 EncryptionCapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 CryptographicEraseCapability =3D Capable=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Disk.Bay.1:Enclosure.Internal.0-1:RAID.Slot.3-1 Status =3D Ok=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 DeviceDescription =3D Disk 1 in Backplane 1 of RAID Contr= oller in Slot 3 RollupStatus =3D Ok=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 Name =3D Physical Disk 0:1:1=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 State =3D Online=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20 OperationState =3D Not Applicable=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 PowerStatus =3D Spun-Up=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Size =3D 931.000 GB=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 FailurePredicted =3D NO=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 RemainingRatedWriteEndurance =3D Not Applicable=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 SecurityStatus =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 BusProtocol =3D SATA=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 MediaType =3D HDD=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 UsedRaidDiskSpace =3D 931.000 GB=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 AvailableRaidDiskSpace =3D 0.001 GB=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Hotspare =3D NO=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 Manufacturer =3D SEAGATE=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ProductId =3D ST1000NX0443=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Revision =3D NB33=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SerialNumber =3D W470SYTP=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 PartNumber =3D CN08DN1YSGW0077F00FQA00=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20 NegotiatedSpeed =3D 6.0 Gb/s=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ManufacturedDay =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ManufacturedWeek =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ManufacturedYear =3D 0=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20 ForeignKeyIdentifier =3D null=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SasAddress =3D 0x4433221107000000=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 FormFactor =3D 2.5 Inch=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 RaidNominalMediumRotationRate =3D 7200=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 T10PICapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 BlockSizeInBytes =3D 512=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 MaxCapableSpeed =3D 6 Gb/s=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20 RaidType =3D None=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20 SystemEraseCapability =3D CryptographicErasePD=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 SelfEncryptingDriveCapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 EncryptionCapability =3D Not Capable=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 CryptographicEraseCapability =3D Capable=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20 --8<---------------cut here---------------end--------------->8--- sdb is an external storage array (Dell MD3400) filled with 10 hard disks (SAS) in a RAID 10 configuration (36.36 TB effective capacity). There are two hot spares that are currently unassigned. They are used automatically when the RAID is degraded. The two RAID controllers have read and write caches enabled. The enclosure has two redundant host interfaces. Berlin has two host based adapter cards of which *one* is connected to the array. Why only one? Because we don=E2=80=99t have multipathd configu= red so that the system could *boot* off the external array with multipath. Without multipath the storage would appear as one disk device per card, but it would not be safe to mount them both at the same time. If we wanted to make use of the redundant connection here: figure out how to add multipathd to the initrd and set up multipath *before* handing off control to Linux. This would effectively double our bandwidth to the storage. My guess is that we=E2=80=99re not even close to saturating the available bandwidth. > I ran the fio benchmark tool on both of them. See the reports > attached, and the following summary: > > | | sda | sdb | > |-------+-----------+-----------| > | read | 1565KiB/s | 9695KiB/s | > | write | 523KiB/s | 3240KiB/s | > > > I'm not sure how slow those figures are relatively to the hard drives > technologies. Ricardo, any idea about that? It seems awfully slow. Especially performance of sda is abysmal: this is a local disk. sdb is the fancy external disk array that=E2=80=99s hooke= d up to two HBA cards. It should not perform *better* than sda. I=E2=80=99ll run this on a few of the build nodes to get some more comparis= ons. --=20 Ricardo