Date: Fri, 27 Mar 2015 09:35:57 +0100 (CET) From: Wojciech Puchar <wojtek@puchar.net> To: d@delphij.net Cc: freebsd-hackers@freebsd.org Subject: Re: Seagate Archive HDD Message-ID: <alpine.BSF.2.20.1503270934520.719@laptop.wojtek.intra> In-Reply-To: <55148E42.80708@delphij.net> References: <alpine.BSF.2.20.1503261124380.1417@laptop.wojtek.intra> <55148E42.80708@delphij.net>
next in thread | previous in thread | raw e-mail | index | archive | help
>> need of rewrite few full tracks worth of data, but otherwise will >> then be compatible and can i use it as usual? > > My understanding is that the SMR drives are actually different class > of storage device. > > The "drive managed" drives as shipped now tries to emulate normal hard > drive's behavior but they present unique risks: for instance, a > rewrite of a small block may end up in a read-modify-write of a much > larger area, so we must refrain from doing such operations for small part (like 10GB) of storage space is formatted without SMR and used as log. writes that doesn't fit full SMR stripe are first written to log then (after possibly very long delay and some coalescing) - read/modify/writted to normal space
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.20.1503270934520.719>