Date: Wed, 03 Sep 2003 21:52:49 +0300 From: Petri Helenius <pete@he.iki.fi> To: Piotr KUCHARSKI <chopin@sgh.waw.pl> Cc: freebsd-performance@freebsd.org Subject: Re: 20TB Storage System (fsck????) Message-ID: <3F563881.70605@he.iki.fi> In-Reply-To: <20030903184506.GC14797@sgh.waw.pl> References: <ILENIMHFIPIBHJLCDEHKOECFDDAA.max.clark@media.net> <3F5634FE.9080303@mac.com> <20030903184506.GC14797@sgh.waw.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
Piotr KUCHARSKI wrote: >How many is "too many"? Or, rather, what are write-performance penalties >when using sixteen disks in one hw raid5 set? (With two raid volumes, >2TB and 1.75TB available for OS.) > > With raid5 you read one and write two disks for each write, wide arrays really hurt when running on degraded mode but I donīt see whatīs the issue when running fully operational? Though people usually expect raid to deliver some performance when degraded so running raid50 instead of too wide raid5 is usually a good idea. (50 being striped raid5 arrays) Pete
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3F563881.70605>