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identity=mailfrom; envelope-from="davide+p9@cs.cmu.edu"; helo=relay-06.andrew.cmu.edu; client-ip=128.2.157.21 Received: from relay-06.andrew.cmu.edu (RELAY-06.ANDREW.CMU.EDU [128.2.157.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx1.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Sun, 26 May 2024 21:06:15 -0400 (EDT) (envelope-from davide+p9@cs.cmu.edu) Received: from lunacy.ugrad.cs.cmu.edu (lunacy.ugrad.cs.cmu.edu [128.2.209.4]) by relay-06.andrew.cmu.edu (Postfix) with ESMTP id 7F3A0800149 for <9fans@9fans.net>; Sun, 26 May 2024 21:06:14 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.11.0 relay-06.andrew.cmu.edu 7F3A0800149 From: Dave Eckhardt To: 9fans <9fans@9fans.net> Subject: Re: [9fans] Throwing in the Towel In-reply-to: <17167523800.5BBf3dBb0.7751@composer.9fans.topicbox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-ID: <16276.1716771974.1@lunacy.ugrad.cs.cmu.edu> Date: Sun, 26 May 2024 21:06:14 -0400 Message-ID: <16277.1716771974@lunacy.ugrad.cs.cmu.edu> Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 5467acb6-1bc5-11ef-b7c9-8f06e2653ada Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMmNhNjc0ODZjN2ExM2E3Ny1NZGE5YjAyNTFhMDQ4MmNlNDBmMTRj?= =?UTF-8?B?NjA2Pg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Content-Transfer-Encoding: quoted-printable List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:Mda9b0251a0482ce40f14c606:1:TWflO8GZ484hkTokYz9Ebs6UwrKsqeeKZBdHePeL6KQ > Can it be the case that the venti index file exhibits a desastrous > write pattern for SSDs? Maybe... but it would need to be worse than the load provided by other file systems, including FAT and ext2/3/4. Some of those file systems rewrite some blocks like mad (e.g., superblock, journal blocks). Just because a flash translation layer might need to erase an entire megabyte, or multiple megabytes, does not mean that it needs to put the new value of a logical block in the same area of the flash that the old value of that logical block used to be in (they do the opposite). It would be interesting to get a dump of the SMART data for the drive(s) that went bad, and also drive(s) that didn't go bad. Dave Eckhardt ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T2ca67486c7a13a77-Mda9b0= 251a0482ce40f14c606 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription