nanog mailing list archives
Re: Got a call at 4am - RAID Gurus Please Read
From: Rob Seastrom <rs () seastrom com>
Date: Thu, 11 Dec 2014 13:48:15 -0500
+1 on both. Mostly SmartOS, some FreeNAS (which is FreeBSD underneath). -r Ryan Brooks <ryan () hack net> writes:
Zfs on BSD or a Solaris like OSOn Dec 11, 2014, at 10:06 AM, Bacon Zombie <baconzombie () gmail com> wrote: Are you running ZFS and RAIDZ on Linux or BSD?On 10 Dec 2014 23:21, "Javier J" <javier () advancedmachines us> wrote: I'm just going to chime in here since I recently had to deal with bit-rot affecting a 6TB linux raid5 setup using mdadm (6x 1TB disks) We couldn't rebuild because of 5 URE sectors on one of the other disks in the array after a power / ups issue rebooted our storage box. We are now using ZFS RAIDZ and the question I ask myself is, why wasn't I using ZFS years ago? +1 for ZFS and RAIDZOn Wed, Dec 10, 2014 at 8:40 AM, Rob Seastrom <rs () seastrom com> wrote: The subject is drifting a bit but I'm going with the flow here: Seth Mos <seth.mos () dds nl> writes:Raid10 is the only valid raid format these days. With the disks as big as they get these days it's possible for silent corruption.How do you detect it? A man with two watches is never sure what time it is. Unless you have a filesystem that detects and corrects silent corruption, you're still hosed, you just don't know it yet. RAID10 between the disks in and of itself doesn't help.And with 4TB+ disks that is a real thing. Raid 6 is ok, if you accept rebuilds that take a week, literally. Although the rebuild rate on our 11 disk raid 6 SSD array (2TB) is less then a day.I did a rebuild on a RAIDZ2 vdev recently (made out of 4tb WD reds). It took nowhere near a day let alone a week. Theoretically takes 8-11 hours if the vdev is completely full, proportionately less if it's not, and I was at about 2/3 in use. -r
Current thread:
- Re: Got a call at 4am - RAID Gurus Please Read, (continued)
- Re: Got a call at 4am - RAID Gurus Please Read Rob Seastrom (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Barry Shein (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Rob Seastrom (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Barry Shein (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Jimmy Hess (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Jon Lewis (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Rob Seastrom (Dec 12)
- Re: Got a call at 4am - RAID Gurus Please Read Barry Shein (Dec 12)
- Re: Got a call at 4am - RAID Gurus Please Read Bacon Zombie (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Ryan Brooks (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Rob Seastrom (Dec 11)
- Re: Got a call at 4am - RAID Gurus Please Read Javier J (Dec 11)