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Everything posted by Alex

  1. For my personal take on Fast I/O see: http://blog.covecube.com/2013/05/stablebit-drivepool-2-0-0-256-beta-performance-ui (scroll down to the Fast I/O section) I believe that I've described it rather well in that post. In short, it's not important but good to have. We are due for a new version today, but I've delayed making a release because of this issue. I am seriously considering disabling Fast I/O read requests on Windows 8 in future builds due to this issue.
  2. Continuing the thread from the old forum: http://forum.covecube.com/discussion/1129/critical-bsod-when-accessing-dp-over-a-network-share Just to recap, I've received a number of memory dumps over the past month or so showing a system crash in srv2.sys. Srv2.sys is Microsoft's file sharing driver that translates network file I/O requests into local file I/O requests on the server, but the implication is of course that StableBit DrivePool may somehow be the cause of these crashes. The crashes only occur on Windows 8 / Windows Server 2012 (including Essentials). Paris has submitted the best dump to date on this issue and I've analyzed it in detail. I'm going to post a technical description of the crash for anyone who can read this sort of thing. What we have A full memory dump of the crash. Verifier enabled on all drivers at the time of the crash (giving us additional data about the crash). ETW logging enabled on CoveFS / CoveFSDisk, giving us everything that CoveFS did right before the crash. The system 3: kd> vertarget Windows 8 Kernel Version 9200 MP (4 procs) Free x64 Product: Server, suite: TerminalServer DataCenter SingleUserTS Built by: 9200.16581.amd64fre.win8_gdr.130410-1505 Kernel base = 0xfffff800`65214000 PsLoadedModuleList = 0xfffff800`654e0a20 Debug session time: Fri May 31 04:45:08.610 2013 (UTC - 4:00) System Uptime: 0 days 0:21:01.550 3: kd> !sysinfo cpuinfo [CPU Information] ~MHz = REG_DWORD 3100 Component Information = REG_BINARY 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 Configuration Data = REG_FULL_RESOURCE_DESCRIPTOR ff,ff,ff,ff,ff,ff,ff,ff,0,0,0,0,0,0,0,0 Identifier = REG_SZ Intel64 Family 6 Model 58 Stepping 9 ProcessorNameString = REG_SZ Intel(R) Core(TM) i7-3770S CPU @ 3.10GHz Update Status = REG_DWORD 2 VendorIdentifier = REG_SZ GenuineIntel MSR8B = REG_QWORD ffffffff00000000 The crash 3: kd> !Analyze -v ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* PAGE_FAULT_IN_NONPAGED_AREA (50) Invalid system memory was referenced. This cannot be protected by try-except, it must be protected by a Probe. Typically the address is just plain bad or it is pointing at freed memory. Arguments: Arg1: fffffa8303aa41ea, memory referenced. Arg2: 0000000000000000, value 0 = read operation, 1 = write operation. Arg3: fffff8800556e328, If non-zero, the instruction address which referenced the bad memory address. Arg4: 0000000000000000, (reserved) Debugging Details: ------------------ READ_ADDRESS: fffffa8303aa41ea Nonpaged pool FAULTING_IP: srv2!Smb2ContinueUncachedRead+26c28 fffff880`0556e328 410fb644240a movzx eax,byte ptr [r12+0Ah] MM_INTERNAL_CODE: 0 IMAGE_NAME: srv2.sys DEBUG_FLR_IMAGE_TIMESTAMP: 51637dde MODULE_NAME: srv2 FAULTING_MODULE: fffff880054ff000 srv2 DEFAULT_BUCKET_ID: WIN8_DRIVER_FAULT BUGCHECK_STR: AV PROCESS_NAME: System CURRENT_IRQL: 0 TRAP_FRAME: fffff88004d3fb60 -- (.trap 0xfffff88004d3fb60) NOTE: The trap frame does not contain all registers. Some register values may be zeroed or incorrect. rax=fffffa830396c150 rbx=0000000000000000 rcx=0000000000000000 rdx=0000000000000000 rsi=0000000000000000 rdi=0000000000000000 rip=fffff8800556e328 rsp=fffff88004d3fcf0 rbp=fffff9801e9e0af0 r8=00000000000006e5 r9=fffff88005544680 r10=fffffa83035a6c40 r11=0000000000000001 r12=0000000000000000 r13=0000000000000000 r14=0000000000000000 r15=0000000000000000 iopl=0 nv up ei ng nz na po cy srv2!Smb2ContinueUncachedRead+0x26c28: fffff880`0556e328 410fb644240a movzx eax,byte ptr [r12+0Ah] ds:00000000`0000000a=?? Resetting default scope LAST_CONTROL_TRANSFER: from fffff8006532f3f1 to fffff8006526e440 STACK_TEXT: fffff880`04d3f978 fffff800`6532f3f1 : 00000000`00000050 fffffa83`03aa41ea 00000000`00000000 fffff880`04d3fb60 : nt!KeBugCheckEx fffff880`04d3f980 fffff800`652a8acb : 00000000`00000000 fffffa83`03aa41ea fffffa83`035be040 fffff880`03cc4419 : nt! ?? ::FNODOBFM::`string'+0x33c2b fffff880`04d3fa20 fffff800`6526beee : 00000000`00000000 fffff980`254b6950 fffff980`1e9e0b00 fffff880`04d3fb60 : nt!MmAccessFault+0x55b fffff880`04d3fb60 fffff880`0556e328 : 00000000`00000000 fffff880`00000000 ffff2f2d`390b1a54 fffff980`01dc8f20 : nt!KiPageFault+0x16e fffff880`04d3fcf0 fffff880`055470de : fffffa83`03c3d1e0 fffff980`01dc8f20 fffff980`254b6950 fffffa83`01f99040 : srv2!Smb2ContinueUncachedRead+0x26c28 fffff880`04d3fd50 fffff880`055455bd : 00000000`00000002 fffffa83`01f99040 fffff980`254b6c60 fffff800`6524acbe : srv2!Smb2ExecuteRead+0x6ce fffff880`04d3fde0 fffff880`05545a64 : fffffa83`0084cd18 fffff980`254b6950 fffff980`1b44efd0 fffff980`254b6950 : srv2!Smb2ExecuteProviderCallback+0x6d fffff880`04d3fe50 fffff880`05543180 : fffff980`1b54cd80 fffff980`1b54cd80 00000000`00000001 fffff980`254b6950 : srv2!SrvProcessPacket+0xed fffff880`04d3ff10 fffff800`65268b27 : fffff880`04d3ff01 00000000`00000000 fffff980`254b6960 fffff880`05546000 : srv2!SrvProcpWorkerThreadProcessWorkItems+0x171 fffff880`04d3ff80 fffff800`65268aed : fffff980`1b54cd01 00000000`0000c000 00000000`00000003 fffff800`652c3ab8 : nt!KxSwitchKernelStackCallout+0x27 fffff880`07f9c9e0 fffff800`652c3ab8 : fffffa83`00000012 fffff980`1b54cd01 00000000`00000006 fffff880`07f97000 : nt!KiSwitchKernelStackContinue fffff880`07f9ca00 fffff800`652c63f5 : fffff880`05543010 fffff980`1b54cd80 fffff980`1b54cd00 fffff980`00000000 : nt!KeExpandKernelStackAndCalloutInternal+0x218 fffff880`07f9cb00 fffff880`05500da5 : fffff980`1b54cd80 fffff980`1b54cd00 fffff980`1b54cd80 fffff800`65277cc4 : nt!KeExpandKernelStackAndCalloutEx+0x25 fffff880`07f9cb40 fffff800`652ac2b1 : fffffa83`035be040 fffff880`05546000 fffff980`1b54cde0 fffff900`00000000 : srv2!SrvProcWorkerThreadCommon+0x75 fffff880`07f9cb80 fffff800`65241045 : fffffa83`03058660 00000000`00000080 fffff800`652ac170 fffffa83`035be040 : nt!ExpWorkerThread+0x142 fffff880`07f9cc10 fffff800`652f5766 : fffff800`6550c180 fffffa83`035be040 fffff800`65566880 fffffa83`0088d980 : nt!PspSystemThreadStartup+0x59 fffff880`07f9cc60 00000000`00000000 : fffff880`07f9d000 fffff880`07f97000 00000000`00000000 00000000`00000000 : nt!KiStartSystemThread+0x16 STACK_COMMAND: kb FOLLOWUP_IP: srv2!Smb2ContinueUncachedRead+26c28 fffff880`0556e328 410fb644240a movzx eax,byte ptr [r12+0Ah] SYMBOL_STACK_INDEX: 4 SYMBOL_NAME: srv2!Smb2ContinueUncachedRead+26c28 FOLLOWUP_NAME: MachineOwner BUCKET_ID_FUNC_OFFSET: 26c28 FAILURE_BUCKET_ID: AV_VRF_srv2!Smb2ContinueUncachedRead BUCKET_ID: AV_VRF_srv2!Smb2ContinueUncachedRead Followup: MachineOwner --------- From the auto analysis we can see that the memory address 0xfffffa8303aa41ea was being accessed from some code at address 0xfffff8800556e328. We can also see that the function that crashed the system is srv2!Smb2ContinueUncachedRead. We can check that memory address and it is indeed invalid: 3: kd> dd 0xfffffa8303aa41ea fffffa83`03aa41ea ???????? ???????? ???????? ???????? fffffa83`03aa41fa ???????? ???????? ???????? ???????? fffffa83`03aa420a ???????? ???????? ???????? ???????? fffffa83`03aa421a ???????? ???????? ???????? ???????? fffffa83`03aa422a ???????? ???????? ???????? ???????? fffffa83`03aa423a ???????? ???????? ???????? ???????? fffffa83`03aa424a ???????? ???????? ???????? ???????? fffffa83`03aa425a ???????? ???????? ???????? ???????? What was srv2 trying to do? So the next question to ask is what was srv2 trying to do and why did it fail? I've gone ahead and decompiled the portion of srv2 that is causing the crash, and here it is: if ( mdl1 && mdl1 != mdl2 && !(mdl1->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL) ) { do { mdlCurrent = mdl1; mdlFlags = mdl1->MdlFlags; mdl1 = mdl1->Next; if ( mdlFlags & (MDL_PARTIAL_HAS_BEEN_MAPPED | MDL_PAGES_LOCKED) ) { MmUnlockPages(mdlCurrent); } IoFreeMdl(mdlCurrent); } while ( mdl1 ); *(_DWORD *)(Length + 4) = 0; } A MDL is a kernel structure that simply describes some memory (http://msdn.microsoft.com/en-us/library/windows/hardware/ff554414(v=vs.85).aspx). The MDL variables: mdl1: 0xfffffa83`03aa41e0 (invalid memory pointer) mdl2: 0xfffffa83`03c3d1e0 3: kd> dt nt!_MDL fffffa83`03c3d1e0 +0x000 Next : (null) +0x008 Size : 0n568 +0x00a MdlFlags : 0n4 +0x00c AllocationProcessorNumber : 0xf980 +0x00e Reserved : 0xffff +0x010 Process : (null) +0x018 MappedSystemVa : 0xfffffa83`03bfd000 Void +0x020 StartVa : 0xfffffa83`03bfd000 Void +0x028 ByteCount : 0x40150 +0x02c ByteOffset : 0 The crash occurs at the point when the function tries to access the MdlFlags member of mdl1 (mdl1->MdlFlags). Since mdl1 points to an invalid memory address, we can't read the flags in. The assembly instructions look like this: srv2!Smb2ContinueUncachedRead+0x26c28: fffff880`0556e328 410fb644240a movzx eax,byte ptr [r12+0Ah] fffff880`0556e32e a804 test al,4 fffff880`0556e330 0f853294fdff jne srv2!Smb2ContinueUncachedRead+0x68 (fffff880`05547768) r12 is mdl1, and we crash when trying to read in the flags. The connection to Fast I/O In every single crash dump that I've seen, the crash always occurs after a successful (non-waiting) Fast I/O read. In fact, the function that calls the crashing function (srv2!Smb2ExecuteRead+0x6ce) has an explicit condition to test for this. Where did mdl1 go? So the question is, why is mdl1 invalid? Did it exist before and was freed, or was there some kind of memory corruption? Here are my observations on this: In every dump that I've seen, the addresses look right. What I mean by that is that the seemingly invalid mdl1 address falls roughly into the same address range as mdl2. It always starts correctly and always ends with 1e0. If this crash was due to faulty RAM, then I would expect to see this address fluctuate wildly. The crash always occurs in the same place (plus or minus a few lines of code). To me, this indicates that there is a bug somewhere. Based on these observations I'm assuming that the mdl1 address in indeed valid, and so it must have been previously freed. But who freed it? We can answer that with a simple verifier query: 3: kd> !verifier 0x80 fffffa8303aa41e0 Log of recent kernel pool Allocate and Free operations: There are up to 0x10000 entries in the log. Parsing 0x0000000000010000 log entries, searching for address 0xfffffa8303aa41e0. ====================================================================== Pool block fffffa83`03aa3000, Size 00000000000018e0, Thread fffff80065566880 fffff80065864a32 nt!VfFreePoolNotification+0x4a fffff80065486992 nt!ExFreePool+0x8a0 fffff80065855597 nt!VerifierExFreePoolWithTag+0x47 fffff880013b32bf vmbkmcl!VmbChannelPacketComplete+0x1df fffff88003f91997 netvsc63!NvscMicroportCompleteMessage+0x67 fffff88003f916a3 netvsc63!ReceivePacketMessage+0x1e3 fffff88003f913ff netvsc63!NvscKmclProcessPacket+0x23f fffff880013b2844 vmbkmcl!InpProcessQueue+0x164 fffff880013b402f vmbkmcl!InpFillAndProcessQueue+0x6f fffff880013b7cb6 vmbkmcl! ?? ::FNODOBFM::`string'+0xb16 fffff880014790d7 vmbus!ChildInterruptDpc+0xc7 fffff80065296ca1 nt!KiExecuteAllDpcs+0x191 fffff800652968e0 nt!KiRetireDpcList+0xd0 ====================================================================== Pool block fffffa8303aa3000, Size 00000000000018d0, Thread fffff80065566880 fffff80065855a5d nt!VeAllocatePoolWithTagPriority+0x2d1 fffff88001058665 VerifierExt!ExAllocatePoolWithTagPriority_internal_wrapper+0x49 fffff80065855f02 nt!VerifierExAllocatePoolEx+0x2a fffff880013b2681 vmbkmcl!InpFillQueue+0x641 fffff880013b4004 vmbkmcl!InpFillAndProcessQueue+0x44 fffff880013b7cb6 vmbkmcl! ?? ::FNODOBFM::`string'+0xb16 fffff880014790d7 vmbus!ChildInterruptDpc+0xc7 fffff80065296ca1 nt!KiExecuteAllDpcs+0x191 fffff800652968e0 nt!KiRetireDpcList+0xd0 fffff800652979ba nt!KiIdleLoop+0x5a ====================================================================== The memory has been originally allocated by vmbkmcl.sys, and has already been freed at the point of the crash. Googling, I found that vmbkmcl.sys is a "Hyper-V VMBus KMCL", and netvsc63.sys is the "Virtual NDIS6.3 Miniport". File times Here are the file times of the drivers that are involved in this complicated interaction. 3: kd> lmvm srv2 start end module name fffff880`054ff000 fffff880`055a0000 srv2 (private pdb symbols) c:\symbols\srv2.pdb\B796522F4D804083998D25552950C4202\srv2.pdb Loaded symbol image file: srv2.sys Image path: \SystemRoot\System32\DRIVERS\srv2.sys Image name: srv2.sys Timestamp: Mon Apr 08 22:33:02 2013 (51637DDE) CheckSum: 000A6B64 ImageSize: 000A1000 Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4 3: kd> lmvm vmbkmcl start end module name fffff880`013b0000 fffff880`013c6000 vmbkmcl (pdb symbols) c:\symbols\vmbkmcl.pdb\82188957E5784EDD91906B760767302E1\vmbkmcl.pdb Loaded symbol image file: vmbkmcl.sys Image path: \SystemRoot\System32\drivers\vmbkmcl.sys Image name: vmbkmcl.sys Timestamp: Wed Jul 25 22:28:33 2012 (5010AB51) CheckSum: 000250C9 ImageSize: 00016000 Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4 3: kd> lmvm netvsc63 start end module name fffff880`03f90000 fffff880`03faa000 netvsc63 (private pdb symbols) c:\symbols\netvsc63.pdb\BD38B199A4C94771860A5F2390CC30E61\netvsc63.pdb Loaded symbol image file: netvsc63.sys Image path: netvsc63.sys Image name: netvsc63.sys Timestamp: Sat Feb 02 02:23:05 2013 (510CBED9) CheckSum: 0001B2D9 ImageSize: 0001A000 Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4 Possible sequence of events In short, it seems to me that: Some memory was allocated to process a network request. That memory was passed to srv2.sys, which is processing that request. The original driver has decided that the memory is no longer needed and freed the memory. srv2.sys is ignorantly trying to access the now freed memory. Workarounds As a potential workaround, turning off Fast I/O should prevent the code that is causing the problem from running. DrivePool 2.0 doesn't yet contain a setting for this but I'll add it in the next build. Turning on Network I/O Boost should also prevent the problem because we do some extra processing on networked read requests when that is enabled, which bypasses Fast I/O. Connection to DrivePool I'm still trying to find a connection to DrivePool in all of this, but I can't. I still can't reproduce this crash on any of the test servers here (4 of them running the windows 8 kernel), nor can I reproduce this on any of my VMs (using VirtualBox). Fast I/O doesn't deal with MDLs at all, so DrivePool never sees any of the variables that I've talked about here. The Fast I/O code in CoveFS is fairly short and easy to check. Because of the potential Hyper-V connection shown above, I'll try to test for this on a Hyper-V VM. As far as what DrivePool was doing right before the crash, I can see from the in-memory logs that it has just completed a Fast I/O read request and has successfully read in 262,144 bytes. Because I don't have a definitive reproducible case, I can't be 100% certain as to what the issue is. I'll keep digging and will let you guys know if I find anything else.
  3. Yep, or just use Quick Settings, which will set up the time for you.
  4. The stylistic inspiration for DrivePool 2.X came from Windows 8, and some mockups that I did for a potential cloud backup solution for the Windows Home Server years ago (way before Metro). This product was meant to follow up the StableBit Scanner, but MS decided to kill drive extender and so we have StableBit DrivePool instead. The functional inspiration came from programs like ICQ (the first IM client), Hamachi (before they got bought by logmein) and Skype. Here's a mock up of the potential OmniBackup web interface: And the file details: The mockups are rough and not finished, but you can already kind of see the "Metro" style in this design. I did this before I ever saw MS's metro.
  5. To be honest, I wasn't 100% comfortable with the arrow not having any text next to it, but I doubt that any designer ever is 100% satisfied with their design. You always want to keep tweaking it to make it perfect, but there are time constraints (plus, we can't exactly afford Johny Ive here). I decided to ship it and listen for feedback, and based on that feedback I've slightly modified the pool options menu. It looks like this now: Let me know what you think.
  6. Alex

    DP network storage

    Well, DrivePool is really tested to be strictly compatible with NTFS. In theory, DrivePool should be able to work with any file system, but in practice you really need to test very thoroughly against any new file system or else bugs will crop up (and you can think of network shares as different file systems). But... I am thinking about networked pools, and I believe that we can solve this problem with a different approach and a new product which is in the works.
  7. Ok. Great. As far as which disk, the error reports don't show. Everything about the disk was coming up blank from VDS.
  8. I've done some more testing with the SiL based cards and have posted a updated builds (2914 / 2915 BETA), along with some other fixes and features. Download: http://stablebit.com/Scanner/Download These builds will use the VID hardware identifier of the controller and the driver name in order to decide when to apply the SiL workaround. The VID that I've put in is 1095.
  9. Ok, thanks for posting that. I'll take a look at why that is. That on-board controller is not using a Silicon Image chip, is it?
  10. Looks like one of your disks is not reporting any name at all. I've posted a new build for you to try in the support request that you've opened. Let me know.
  11. @weezywee Very cool. That APC box looks familiar (I think). I have a APC UPS that I've hacked to use 4x deep cycle marine batteries to provide 3 to 4 hours backup for my entire office (instead of the built in Li-Ion which would only last 15 min.).
  12. Thanks for your feedback, I'm definitely listening. While strictly speaking this is not a "Metro UI", I agree, it is similar. I thinks that one of the major problems with Metro is discoverability, it is nearly non-existent. If you're not familiar with it then you don't know what to click and where. Other than that, it's pretty neat. So I'll try to add more "discoverability" to DrivePool to make it easier to use.
  13. Ok, I've put in a fix and it looks like it's working over here. Try this build and let me know if that fixes the S/N problem. Download: Windows: http://dl.covecube.com/ScannerWindows/beta/download/StableBit.Scanner_2.4.0.2911_BETA.exe WHS 2011: http://dl.covecube.com/ScannerWhs2/beta/download/StableBit.Scanner_2.4.0.2912_BETA.wssx It may take a few minutes for the new S/N data to funnel down to DrivePool.
  14. This is actually a very interesting issue. According to the testing that I've been doing with the SiL3132 (3.0 Gb/s SATA II) card, it seems like the Si drivers do not respond properly to the Disk IDENTIFY and the SMART querying command that we're using. I bet this is what you're seeing. The StableBit Scanner tries multiple ways of communicating with the disk and the only one that goes through on some of these Si controllers is what's called the SMART_RCV_DRIVE_DATA (http://msdn.microsoft.com/en-us/library/windows/hardware/ff566204(v=vs.85).aspx). Unfortunately, the controller driver seems to only be able to query the drive connected to the first port, regardless of where we're sending the command. This means that all the drives connected to a single Si controller will identify as the same drive. I've also verified this with other software that uses SMART_RCV_DRIVE_DATA, and it too is seeing the same problem, so it doesn't look like we're doing anything wrong on this end. I think this is the problem that you're seeing. Now the question is, why was this working before? I've setup a test rig with a few Si3132 cards and have just discovered that WMI and the very basic storage device descriptor (which both provide far less detailed data about the drive) actually return the correct model / serial number for drives on those cards. So the answer is to somehow detect this condition and avoid using the invalid IDENTIFY and SMART data, when dealing with these broken Si drivers. I'm working on this right now and a fix should be out in the next build of the StableBit Scanner.
  15. Yeah, unfortunately this is a restriction of build 260. I'm pretty sure that we can fix this in a future build. The file performance UI uses the PhysicalDisk performance counters to get the disk activity time, and it expects to find a drive letter in the instance name. But there's no reason why it has to look for the drive letter.
  16. For example, in the attached screen you can see a 5.46 TB pool which is not evenly distributed. But this is ok since you can still copy new files to the pool. DrivePool will simply place the new files on the disk with the most free space.
  17. DrivePool has a fairly complex balancing system, but by default it's set up to balance only when absolutely necessary. In other words, only when new file creation is not possible (or obstructed). If you really want to balance everything evenly you can install the Disk Space Equalizer plug-in from here: http://stablebit.com/DrivePool/Plugins
  18. Welcome everyone to the new Forum! In an effort to support our growing community, the old Vanilla based forum was retired. It will remain available at its old URL http://forum.covecube.com, but you won't be able to post anything new there. This new forum can be accessed at http://community.covcecube.com. Login Credentials If you've created an account on the old Vanilla forum, you can actually use the same username and password to log into this forum. In addition, this new forum now supports logging in with your Windows Live ID. Community With this new forum, my hope is to give our community a place to talk about technology as it surrounds our products, and not just focus on the products themselves. To this end, I've set up a few sub-forums: StableBit Scanner - Compatibility With all the different hardware out there (disk controllers, hard drives, ect...) it's tough to know what works best, especially when dealing with SMART passthrough. I'd like this to be the place to discuss what works and what doesn't. StableBit DrivePool - Hardware StableBit DrivePool is a very fast pooling solution that is capable of creating very large pooling arrays. Share your setup, brag about your pool size , and get hardware advice here. Nuts & Bolts Recently I've been overhauling the manuals section over at stablebit.com/support (yes, it's way overdue), and I found it amazing how many intricacies there are to these little programs. I realized that it might be fun to talk about these things so I've set up a new forum called Nuts & Bolts where I will be posting a topic every now and again about some technical aspect of our software. The topics will be open for discussion, so we can go back and forth about what people think about that particular topic. Moderators Our "Resident Gurus" Shane and saitoh183 will be joining us in the new forum as moderators, and we have Drashna (technical support) and myself as the Admins.
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