RAID 5 Issues!
That's what tape is for. permalinkembedsaveparentgive gold[–]TheGraycatI remember when this was all one flat network 5 points6 points7 points 4 years ago(3 children)Ah, so it's different again if you're using SATA vs SAS? The NetBSD Foundation. As a last line of defense, a data-source-level integrity check value is computed and compared by the client after it has reassembled a data source. http://robotadv.com/raid-5/raid-5-help.html
Never ignore a RAID-5 data storage subsystem fault warning, or any behavioral anomaly; if a drive has failed, first back up the data in the array, then replace the drive, and permalinkembedsavegive gold[–]mscmanHPC Solutions Architect 4 points5 points6 points 4 years ago(1 child)With 300GB drives, you'll probably be safe. permalinkembedsaveparentgive gold[–]pi3832v2Accidental Sysadmin 0 points1 point2 points 4 years ago(0 children) Just don't wait for more disks to fail. To fill this gap, inexpensive "RAID controllers" were introduced that do not contain a dedicated RAID controller chip, but simply a standard drive controller chip with proprietary firmware and drivers.
Why Not To Use Raid 5
Oops, something's wrong below. permalinkembedsaveparentgive gold[–]EuripidesOutDPSStorage Admin 0 points1 point2 points 4 years ago(4 children)Don't get me wrong, when we go to wide striping and a double disk failure could bring down an entire pool, we're going Concurrent disk failures are a real thing. Those smr drives seem like they will work perfectly as parity drives or for larger sequential files like video.
RAID 5 with five 8TBs is probably not fine. How can I transition a square duct to round of the same outer size? Not so. Is Raid 5 Safe No disk rebuilding was needed and I was able to backup all files of the remaining 3 in the Array within a few hours without a performance impact.
Most people forget to consider how long it takes to rebuild that massive raid-5/6 array when it's under 100% load. Dell Raid 5 Is No Longer Recommended This is not 100% true, but it is essentially true. The error you have doesn't suggest any RAID problems at all. 2 Pure Capsaicin OP Scott Alan Miller This is a Dell PowerEdge 2900 server. Featured Research Big Data SLI Cloud infographics theCUBE Peer Incite Archive Announcements All New Content on Wikibon dot com Wikibon Big Data Capital Markets Day TheCUBE 2013 Schedule TheCUBE 2014 Schedule
Other industries such as consumer electronics with DVDs are using 56-of-64 encoding techniques that can tolerate 8 simultaneous bit failures and tolerate scratches on the disk for example. Raid 5 Vs Raid 6 Retrieved 2010-03-10. ^ Disk Failures in the Real World: What Does an MTTF of 1,000,000 Hours Mean to You? permalinkembedsaveparentgive gold[–]aceat64Linux Admin 2 points3 points4 points 4 years ago(5 children)I don't understand. If you want to use crappy disks and want data protection and bad performance, but need to have lots of space, use RAID-6.
Dell Raid 5 Is No Longer Recommended
Etc. As it always stripes over top-level vdevs, it supports equivalents of the 1+0, 5+0, and 6+0 nested RAID levels (as well as striped triple-parity sets) but not other nested combinations. Why Not To Use Raid 5 That's pretty uncomfortable. Raid 5 Is No Longer Recommended For Any Business Critical Information On Any Drive Type At some point, making multiple copies to address longer rebuild times becomes unsustainable.
I just had all kinds of issues with ZFS recently but it was because I just did weekly inspections. http://robotadv.com/raid-5/raid-5-help-please.html Retrieved 2013-12-25. ^ "Main Page - Linux-raid". permalinkembedsaveparentgive gold[–]trouphaz 18 points19 points20 points 4 years ago(24 children)It depends on the equipment you're using. So upvotes for you guys who understand probability and aren't speaking in absolutes. Raid 5 Rebuild Time Calculator
pp.29, 32. PostgreSQL 9.0: High Performance. Hardware or software RAID? his comment is here That said: I suspect most people with large datasets probably don't have full backups.
With such long rebuild times, the chance of multiple drive errors, which historically has been very slight, increases dramatically. Raid 6 Vs Raid 10 I am wondering if it would make sense to replace all the drives in the array so the problem does not reoccur? Actual read throughput of most RAID1 implementations is slower than the fastest drive.
permalinkembedsaveparentgive gold[–]misterkrad 0 points1 point2 points 4 years ago(4 children)Raid-10 is just so affordable given sas/sata drive patterns. 600gb (3.5"/2.5") sas are less than 400 bucks and 2-3TB were around 200-300 a pop Triple parity schemes, or triple mirroring, have been suggested as one approach to improve resilience to an additional drive failure during this large rebuild time. Atomicity: including parity inconsistency due to Not even RAID10 or zfs. What Is Raid 5 all sectors are gone) plus an URE on another sector during a rebuild.
A phrases that basically means 'walk your walk back back' Produce cards with a PNG background for each card Why do model aircraft fly and maneuver so differently from real aircraft? Again, RAID5 here will not be the reason for data loss if you do what you're supposed to do and back up critical data. In the cases of full block writes, which using RAID60 are more common not less common it doesn't require the read of the modified block. . weblink Can a wizard cast Shield using a higher level spell slot?
permalinkembedsavegive gold[–][deleted] 0 points1 point2 points 4 years ago(1 child)Would anything be wrong with two 4-disk Raid 5 arrays? permalinkembedsaveparentgive gold[–]misterkrad 1 point2 points3 points 4 years ago(1 child)you do realize that ssd's wear out at the same time, so raid-1/10 of ssd is useless when they all go into read-only mode I am a little worried, as I've been looking into hybrid SANs and noticing that a few of them seem to be RAID5'ing the disk behind their SSD/NAND cache. permalinkembedsaveparentgive gold[–]WornOutMeme 3 points4 points5 points 4 years ago(1 child)|Toe the line FTFY permalinkembedsaveparentgive gold[–]ChrisOfAllTradesAdmin ALL the things! 4 points5 points6 points 4 years ago(0 children)What if I'm a fisherman using trawling nets?
Finish the rebuild then run a file system check. Official Dell link: New EqualLogic RAID Tech Report considerations and best practices released! - Dell TechCenter Obligatory links with mildly sensationalist and overgeneralized titles: Why RAID 5 stops working in 2009 Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. permalinkembedsaveparentgive gold[–]cyclepathology -3 points-2 points-1 points 4 years ago(1 child) Most people bashing your raid choice have never worked with storage arrays in the thousands/tens of thousands of drives.
RAID5 on a PERC card is difficult, not just for reliability reasons. The second-stage boot loader for FreeBSD is capable of loading a kernel from such an array. Firmware- and driver-based A SATA3.0 controller that provides RAID functionality through proprietary firmware and drivers Immediately replace a failed hard disk drive element upon fault detection; the replacement must be a pre-tested, known working device, fully conforming to subsystem designer specifications. Mike Alvarado Posted By:David Vellante|Wed Dec 08, 2010 08:56 It is a way on from this initial conversation but here is another Blog post on a the impending death of RAID
ISBN0-8493-2615-X. ^ "What is RAID (Redundant Array of Inexpensive Disks)?". Because when people look to RAID they're looking for some degree of fault-tolerance and uptime. Right now, though, the cost and low likelyhood of a double disk failure don't justify the cost of moving to RAID 6. Windows XP can be modified to support RAID0, 1, and 5. Windows 8 and Windows Server 2012 introduces a RAID-like feature known as Storage Spaces, which also allows users to specify
The technique can be done across servers or within an array or potentially even within a drive. Rao, and J.A. permalinkembedsaveparentgive gold[–]gimpbullyHPC Storage Engineer 7 points8 points9 points 4 years ago(10 children)14? I know both HDS and EMC have proactive sparing of their drives once they see certain error patterns.
With its "far" layout, MD RAID10 can run both striped and mirrored, even with only two drives in f2 layout; this runs mirroring with striped reads, giving the read performance of As a result, Cleversafe is able to offer data integrity SLA’s to its customers, since it can always verify the integrity of data each time it is read.