I am assuming you skip the defrag section of this, or will sdelete only zero out the last contiguous block of “free” space?
I only ask as we snapshot our KVM zones frequently, so any kind of defrag would probably fill the zpool pretty quickly! > On 18 Jan 2017, at 08:25, Ian Collins <[email protected]> wrote: > > On 01/18/17 08:31 PM, Matthias Goetzke wrote: >> We have a machine which temporarily got 98% full and the boot time of a KVM >> windows server has gotten quite extreme (minutes on the black part of the >> boot alone). >> Apart from over-allocating, we guess it might have to do with fragmentation >> of the underlying C drive (just a hunch due to the number of writes on C and >> the fact that overall fragmentation was temporarily >78%) since another win >> machine still booted up quite quickly. >> >> If a kvm disk were just a file then I could just make a copy of the C drive >> (I have enough space now) into a new file which should (in theory) just >> create new aligned blocks and once I delete the old file it should be >> defragmented mostly. >> > > A KVM disk is a sparse provisioned zfs volume, not a file. > > Part of the basic maintenance I perform on Windows KVMs is well documented > here: > > https://www.maketecheasier.com/shrink-your-virtualbox-vm > <https://www.maketecheasier.com/shrink-your-virtualbox-vm>. > > You will see the REFER number for the volume reduce dramatically when you run > sdelete. > > It is also fairly easy to increase the volsize of the underlying disk and > expand your windoze partition to fill it. > -- > Ian. > smartos-discuss | Archives > <https://www.listbox.com/member/archive/184463/=now> > <https://www.listbox.com/member/archive/rss/184463/28443474-1732e24d> | > Modify <https://www.listbox.com/member/?&;> Your Subscription > <http://www.listbox.com/> ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
