On 21 jun. 2012, at 17:15, Wojciech Puchar <woj...@wojtek.tensor.gdynia.pl> wrote:
>> >> 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. In other topic you hammerd on fact and if someone ask you to deliver them its a stupid question. And about the dram error. I really hope you do use ecc memory in production which renders your scenario invalide. And even then its a claim made by you some random dude on a list. Without proper test scenario and documentation such claims are just useless. And a proper layout zfs will withstand a double disk failure with zero downtime...where younhave to tell your customer they just lost a day work_______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
