The HGST He8 HDDs completed its rebuild in 19 hours and 46 minutes. The Seagate Archive HDDs completed their rebuild in 57 hours and 13 minutes
this is ... a feature. right? Am 24.03.2015 um 18:05 schrieb Dale Kline: > READ THE DOCUMENTATION THOROUGHLY on these SMR drives. There are serious > WRITE restrictions on these drives because of the overlapping (shingled) > tracks. I have read over several times and am still not sure of all of the > caveats. As Tom states below, they are to be used mainly in "WRITE ONCE, > READ MANY" environments. > > -----Original Message----- > From: owner-freebsd-hardw...@freebsd.org > [mailto:owner-freebsd-hardw...@freebsd.org] On Behalf Of Tom Evans > Sent: Tuesday, March 24, 2015 12:39 PM > To: Shehbaz Jaffer > Cc: FreeBSD FS; grarpamp; freebsd-hardware@freebsd.org > Subject: Re: Zoned Commands ZBC/ZAC, Shingled SMR drives, ZFS > > On Tue, Mar 24, 2015 at 12:47 PM, Shehbaz Jaffer <shehbazjaffer...@gmail.com> > wrote: >> Hi, >> >> I was wondering what cost advantage do SMR drive provide as compared >> to normal CMR drive? >> >> 8TB SMR drive - $ 260 >> 3TB CMR (Conventional Magnetic Recording drive) - $ 105 >> > > Purchase price is not irrelevant, but the key benefits are increased capacity > per disk, and reduced power usage per disk and (multiplied by the increase in > capacity) per TB. In other words, they disks consume less power, you need > fewer of them, maybe allowing you to run fewer servers. > > Of course, you also need a mainly read only workload. The RAID rebuild test > from the linked review is *scary*. I wouldn't use these in ZFS raidz without > plenty of disaster recovery testing - how long does it take to re-silver the > pool when you lose a disk and what is the performance characteristics of the > pool whilst it is doing so. > > Cheers > > Tom > _______________________________________________ > freebsd-hardware@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hardware > To unsubscribe, send any mail to "freebsd-hardware-unsubscr...@freebsd.org" > _______________________________________________ > freebsd...@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscr...@freebsd.org" > _______________________________________________ freebsd-hardware@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hardware To unsubscribe, send any mail to "freebsd-hardware-unsubscr...@freebsd.org"
