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Recent content by tarnar

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    Under-sizing ZFS for future replacement

    One of the quirks I've read about ZFS during my research / build of my current storage server is that replacing disks absolutely requires the new disk to have the same number of sectors or more. For example, if you replace a 2TB drive with a 2TB drive that's even a few sectors smaller then...
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    Benchmark Results 4 x Crucial M4 256GB SSD Raid-0

    How about the best of both worlds? RAID 1+0 ? $440 for a half terabyte isn't a superhot deal but considering it *should* give you 2x write speeds and up to 4x read speeds...
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    Reconsidering Mirroring

    That's how I've been looking at it - test it, then decide if that rebuild time fits with my requirements. Was just wondering if there was some math I could use to see if the rebuild time I find is sane. Another quick question - when you do dual-path for redundancy do you get get the extra...
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    RAID 60 Using ZFS

    I think you should ignore 12 Gb SAS stuff. As you can see from that PDF, a 6 Gb SAS port like the 8087 has four 6 Gb channels. The SATA forward breakout cables have four ports and each channel gets a port. So that single 8087 port drives four 6 Gb SATA disks. Those 7200 RPM SATA disks...
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    Reconsidering Mirroring

    How does one do that math, roughly? Is that an all-SAS topology? No SATA drives?
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    Plextor targeting gamers with a super-fast PCI-E SSD

    On the topic of RAIDing together SSDs, given that gamers prioritize read performance over writes (and generally don't write large volumes of data while gaming), isn't a RAID1 of SSDs always better than a RAID0, assuming a sensible RAID implementation? After all, when mirroring the RAID system...
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    RAID 60 Using ZFS

    8088 is the external SAS port, same as an Ethernet port is RJ45. There isn't any speed information baked into the port spec that I'm aware of. 'SFF8087 to 4xSATA forward breakout' cables are rated to SATA3 @ 6 GBit. The 'proper' way to do it would be to buy HBAs with SFF8087 ports if you...
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    RAID 60 Using ZFS

    SFF8087 is the name of the most common internal SAS port. In my configuration my HBA has two of these ports. Each port has an SFF8087 to 4x SATA cable, called a 'forward breakout' cable. There are different SFF port numbers / types / cables for external connections. Part of what makes it...
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    RAID 60 Using ZFS

    Quite a lot of money too. Sticking with SATA disks and cheap HBAs (such as the ones mentioned in this thread, both based on the LSI2008 chipset) brings a huge cost savings over going to SAS disks, using expanders, etc. A single HBA drives 8 disks. That's close to / beyond what you'll fit...
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    RAID 60 Using ZFS

    A cross-flashed Dell Perc H310, running native LSI firmware in 'IT' mode. That particular HBA has two internal SAS ports, each of which has a cable with 4 SATA ports hanging off the end, for a total of eight disks. I believe that's called a 'forward breakout' cable. Correct. The pool is...
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    RAID 60 Using ZFS

    The answer depends on what you want to be resilient to, which is an answer that might be informed by your disk topography. Here's an example based on the storage server I'm working on. The disk topography is two ports in an HBA, each port goes out to four disks, for a total of eight disks...
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    Testing failure & rebuild

    Yes. camcontrol(8) seems to be what I'm after for the spin-down/disconnect. First, to fill the disk with junk. Instead of one really really big file I'm rolling out lots of 4 gig files. Some from /dev/urandom, some from /dev/zero. Some copies, some cat'd together. The rest makes...
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    Testing failure & rebuild

    Hey all, I've been working on my storage server and am getting very close to actually considering it 'ready for use'. The last thing I want to test is that resilience actually works and see how long a rebuild actually takes. A quick overview of the setup. ESXI 5.1 server - Xeon -...
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    Flashing IT firmware to Dell H200 on X9SCM

    Out of curiosity do you recall the exact error you got in FreeDOS? Was it the PAL error or a different one? I recently cross-flashed an H310 and it took me three different motherboards before I could use a cross-flash capable sas2flsh.exe, yet only one motherboard gave me the PAL error. The...
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    ZFS & partitioned disks

    Thanks for replying. The plan isn't to run other raid types all the time, only when it actually comes time to juggle drives / migrate pools. Which means I'm wasting a lot of drive space by leaving it unallocated most of the time, possibly for years (this is the biggest strike against the...
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