25 мая 2014 г. 15:19:53 CEST, Richard Elling via illumos-discuss <[email protected]> пишет: > >On May 24, 2014, at 3:32 PM, Günther Alka via illumos-discuss ><[email protected]> wrote: > >> SSDs are the future of high performance storage. >> With most consumer SSDs overpovisioning is a common way to keep write >performance high. >> >> On Linux you can use hdparm to create a host protected area with the >main advantage that you do not need to struggle with partitions or >slices - just use the whole disk as usual. >> >> read >> http://www.thomas-krenn.com/de/wiki/SSD_Over-Provisioning_mit_hdparm >> >> >> Has anyone compiled hdparm for Illumos or know about a Solaris tool >to create a host protected area? > >But why bother overprovisioning with such a low-level tool? We use ZFS, >if you want to reserve some space, make a reservation :-) > >> >> sdparm? >> https://www.illumos.org/issues/2899 > >It should compile fine, OOB. > -- richard > >-- > >[email protected] >+1-760-896-4422 > > > > > > >------------------------------------------- >illumos-discuss >Archives: https://www.listbox.com/member/archive/182180/=now >RSS Feed: >https://www.listbox.com/member/archive/rss/182180/22642773-76f3f1fc >Modify Your Subscription: >https://www.listbox.com/member/?&; >Powered by Listbox: http://www.listbox.com
ZFS reservations certainly are not it - this is a way to reserve some amount of blocks from being referenced by other datasets. Without TRIM/UNMAP support, this is not a way to guarantee that such amount of blocks would be zero on disk and thus (if this is at all a criterion for a certain ssd's firmware) subject this amount of LBAs to consideration as empty for the purposes of garbage collection and RMW's of ssd pages. Thus this space would be sacrificed for no good reason - useless for other datasets, but not advancing performance nor reliability of the ssd's. My 2c, //Jim -- Typos courtesy of K-9 Mail on my Samsung Android ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
