search for: mttdl

I''ve blogged about the trade-offs for space, performance, and MTTDL (RAS) for ZFS and RAID in general. http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance Enjoy. -- richard

Hi all, I''m putting together a OpenSolaris ZFS-based system and need help picking hardware. I''m thinking about using this 26-disk case: [FYI: 2-disk RAID1 for the OS & 4*(4+2) RAIDZ2 for SAN] http://rackmountpro.com/productpage.php?prodid=2418 Regarding the mobo, cpus, and memory - I searched goggle and the ZFS site and all I came up with so far is that, for a

Hi all, I''m putting together a OpenSolaris ZFS-based system and need help picking hardware. I''m thinking about using this 26-disk case: [FYI: 2-disk RAID1 for the OS & 4*(4+2) RAIDZ2 for SAN] http://rackmountpro.com/productpage.php?prodid=2418 Regarding the mobo, cpus, and memory - I searched goggle and the ZFS site and all I came up with so far is that, for a

...+0 + 2 hot spares 15x3-way RAID-Z2+0 + 1 hot spare ... Because some people get all wrapped up with the controllers, assume 5 8-disk SATA controllers plus 1 6-disk controller. Note: the reliability of the controllers is much greater than the reliability of the disks, so the data availability and MTTDL analysis will be dominated by the disks themselves. In part, this is due to using SATA/SAS (point-to-point disk connections) rather than a parallel bus or FC-AL where we would also have to worry about bus or loop common cause failures. I will be concentrating on data availability and MTTDL as two...

for s10u2, documentation recommends 3 to 9 devices in raidz. what is the basis for this recommendation? i assume it is performance and not failure resilience, but i am just guessing... [i know, recommendation was intended for people who know their raid cold, so it needed no further explanation] thanks... oz -- ozan s. yigit | oz at somanetworks.com | 416 977 1414 x 1540 I have a hard time

Selim Daoud wrote: > here''s an interesting status report published by Microsoft labs > > http://research.microsoft.com/research/pubs/view.aspx?msr_tr_id=MSR-TR-2005-166 That is the paper in which Jim Gray coined "Mean time to data loss". It''s been quoted here before. Sad note: Turing award winner Jim Gray has been missing now for two weeks, after he went

I currently have a 7x1.5tb raidz1. I want to add "phase 2" which is another 7x1.5tb raidz1 Can I add the second phase to the first phase and basically have two raid5''s striped (in raid terms?) Yes, I probably should upgrade the zpool format too. Currently running snv_104. Also should upgrade to 110. If that is possible, would anyone happen to have the simple command lines to

Which consumer-priced 1.5TB drives do people currently recommend? I had zero read/write/checksum errors so far in 2 years with my trusty old Western Digital WD7500AAKS drives, but now I want to upgrade to a new set of drives that are big, reliable and cheap. As of Jan 2010 it seems the price sweet spot is the 1.5TB drives. As I had a lot of success with Western Digital drives I thought I would

I''m a fan of ZFS since I''ve read about it last year. Now I''m on the way to build a home fileserver and I''m thinking to go with Opensolaris and eventually ZFS!! Apart from the other components, the main problem is to choose the motherboard. The offer is incredibly high and I''m lost. Minimum requisites should be: - working well with Open Solaris ;-) -

Hi all I have a test system with snv134 and 8x2TB drives in RAIDz2 and currently no Zil or L2ARC. I noticed the I/O speed to NFS shares on the testpool drops to something hardly usable while scrubbing the pool. How can I address this? Will adding Zil or L2ARC help? Is it possible to tune down scrub''s priority somehow? Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at

Hey folks, I guess this is an odd question to be asking here, but I could do with some feedback from anybody who''s actually using ZFS in anger. I''m about to go live with ZFS in our company on a new fileserver, but I have some real concerns about whether I can really trust ZFS to keep my data alive if things go wrong. This is a big step for us, we''re a 100% windows