Date: Tue, 22 Jan 2019 11:15:59 +0000 (GMT) From: andy thomas <andy@time-domain.co.uk> To: Ireneusz Pluta <ipluta@wp.pl> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS on Hardware RAID Message-ID: <alpine.BSF.2.21.1901211548570.24493@mail0.time-domain.co.uk> In-Reply-To: <ee6353dc-161f-407e-d976-71ca652970a0@wp.pl> References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <CAOeNLurgn-ep1e=Lq9kgxXK%2By5xqq4ULnudKZAbye59Ys7q96Q@mail.gmail.com> <alpine.BSF.2.21.1901200834470.12592@mail0.time-domain.co.uk> <ee6353dc-161f-407e-d976-71ca652970a0@wp.pl>
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On Sun, 20 Jan 2019, Ireneusz Pluta wrote: > W dniu 2019-01-20 o?09:45, andy thomas pisze: >> I run a number of very busy webservers (Dell PowerEdge 2950 with LSI >> MegaRAID SAS 1078 controllers) with the first two disks in RAID 1 as the >> FreeBSD system disk and the remaining 4 disks configured as RAID 0 virtual >> disks making up a ZFS RAIDz1 pool with 3 disks plus one hot spare. > In this configuration, have you ever made a test of causing a drive failure, > to see the hot spare activated? Yesterday I set up a spare Dell 2950 with Perc 5/i Integrated HBA and six 73 GB SAS disks, with the first two disks configured as a RAID 1 system disk (/dev/mfid0) and the remaining 4 disks as RAID 0 (mfid1- mfid4). After adding a freebsd-zfs GPT partition to each of these 4 disks I then created a RAIDz1 pool using mfid1p1, mfid2p1 and mfid3p1 with mfid4p1 as a spare, followed by creating a simple ZFS filesystem. After copying a few hundred MB of files to the ZFS filesystem, I yanked /dev/mfid3 out to simulate a disk failure. I was then able to manually detach the failed disk and replace it with the spare. Later, after pushing /dev/mfid3 back in followed by a reboot and scrubbing the pool, mfid4 automatically replaced the former mfid3 that was pulled out and mfid3 became the new spare. So a spare disk replacing a failed disk seems to be semi-automatic in FreeBSD (this was version 10.3) although I have seen fully automatic replacement on a Solaris parc platform. Andy
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