Date: Thu, 21 Jun 2012 17:15:07 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Matthias Gamsjager <mgamsjager@gmail.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Is ZFS production ready? Message-ID: <alpine.BSF.2.00.1206211707570.3361@wojtek.tensor.gdynia.pl> In-Reply-To: <CA%2BD9QhsyOh34SghWzQPpnTig%2BUmSEO2VP7jfPxTXs9zW9Uakeg@mail.gmail.com> References: <4FE2CE38.9000100@gmail.com> <CAPj0R5Kmi-%2BdJ7mPvTrTAoS8O983svOyR2WyK2_v1Cr07dSS_A@mail.gmail.com> <alpine.BSF.2.00.1206211413140.2263@wojtek.tensor.gdynia.pl> <CA%2BD9QhuQ%2BbxKW9%2BdX%2BzS9mErwz8JSkV2G7qL0KfB8BH_LGJAgA@mail.gmail.com> <alpine.BSF.2.00.1206211539230.2903@wojtek.tensor.gdynia.pl> <CA%2BD9QhvR_eKtVxdKcaMyOS7tLw_AOHKgUy3o7mJn2b=chMA0Xw@mail.gmail.com> <alpine.BSF.2.00.1206211619250.3092@wojtek.tensor.gdynia.pl> <CA%2BD9QhvwKZm7heoe7tpfhYCJvkknw_HC7aFjCu%2B-1xYQBmV6ng@mail.gmail.com> <alpine.BSF.2.00.1206211644350.3170@wojtek.tensor.gdynia.pl> <CA%2BD9QhsyOh34SghWzQPpnTig%2BUmSEO2VP7jfPxTXs9zW9Uakeg@mail.gmail.com>
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> > I do understand your setup but I dont have too agree that it is a good so i would repeat my question. Assume you have 48 disks, in mirrored configuration (24 mirrors) and 480 users with their data on them. Your solution with ZFS - ZFS crashes or you get double disk failure. Assuming the latter by average one per 24 file (randomly chosen) is destroyed which - in practice and limited time, means everything destroyed. Actually more than one per 24 - large files can be spread over. Your solution with UFS - better as there is fsck which slowly but successfully repairs problem. with double disk failure - the same! You restore everything from backup (i assume you have one). This takes like a day or more, one or two complete work days lost+all users in practice lost everything since last backup. My solution with UFS - fsck in case of failure work in parallel on 24 disks so not that long. double disk failure means losing data of 1/24 users. every one per 24 user cannot work, others work and i without any stress do recover this 1/24 of users data from backup after putting replacement disks. 1/24 of users lost data since last backup, and some hours of time. Even assuming ZFS is perfect then we both have problems as often, but my problems are 1/24 as severe as yours. Just don't ask me for help when unhappy users will want to cut off your head. >> And you've never seen me, yet i still exist. >> > > Really? that's you anwser to my question. The most childish answer I could stupid answer to stupid question. You never seen - but they do happens.
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