For better random and small reads, mirrored pools are preferred On June 15, 2015 9:18:45 PM EDT, Sebastien Perreault <[email protected]> wrote: >Hi, > >I've been using similar servers for a while for KVM linux machines, and >the only I was able to achieve decent performance with no SLOG was with >RAID MIRROR only configuration, so 2 disks with 2 disks, not perfect >but >good enough for my needs. > > I did try the default RAID-Z, that was a no-go, but RAID MIRROR is ok >(it's still SATA disks in the end). > >Seb, > >On Mon, Jun 15, 2015 at 9:07 PM, <[email protected]> wrote: > >> one of my clients owns a supermicro-based box with 4 hot-swap sata >bays. >> it has integrated SATA and (i believe) no SAS. the original admin >populated >> it with (3) 1TB SATA disks and commissioned it as a fileserver >(simple >> raid5). it has 32GB of memory. the box is no longer being used, so >it's >> been allocated to me for the purpose of hosting another windows >server. i'd >> like to virtualize the server via smartos/kvm but i have >reservations. >> >> i believe i can get away with using only 16GB for VMs, so that leaves >16GB >> for smartos/zfs - i think that'll probably work well. but i seriously >doubt >> those disks will give anything resembling decent performance. i only >have 4 >> bays to work with, and only one is currently free. for a windows >server VM >> hosting a multi-user database, would adding a SATA SSD as log device >for >> the zones zpool keep me out of hot water here or is this just not >going to >> work? >> >> obviously i can try to source a supported SAS controller and disks, >but >> i'm wondering if i can actually get by with SATA ... what if i filled >the >> (4) 3.5" bays with SSDs and striped across two mirrors? would that >mostly >> guarantee decent performance, or will that just waste time and money? >> >> experienced opinions greatfully accepted! >> >> >> ------------------------------------------- >> smartos-discuss >> Archives: https://www.listbox.com/member/archive/184463/=now >> RSS Feed: >> https://www.listbox.com/member/archive/rss/184463/26900931-98fbc364 >> Modify Your Subscription: >> https://www.listbox.com/member/?&; >> Powered by Listbox: http://www.listbox.com >> > > > >-- >Sebastien Perrreault >Partner >Les Technologies Alesium Inc >P: 514-298-7193 >F: 514-221-3668 >E: [email protected] > >"Life's missed opportunities, at the end, may seem more poignant to us >than >those we embraced--because in our imagination they have a perfection >that >reality can never rival." -- Roger Ebert > > > >------------------------------------------- >smartos-discuss >Archives: https://www.listbox.com/member/archive/184463/=now >RSS Feed: >https://www.listbox.com/member/archive/rss/184463/27088356-7e8b0922 >Modify Your Subscription: >https://www.listbox.com/member/?&; >Powered by Listbox: http://www.listbox.com
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