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• How to understand the LSI HBA connector specs?

  - by Sandra

  When reading the specifications for the LSi SAS 9206-16e HBA, it says Storage Connectivity; Data Transfer Rates * 16 ports; 6Gb/s SAS 2.1 compliant SAS Bandwidth * Half Duplex 2400MB/s, x4, 6Gb/s SAS lanes Port Configurations * 16 ea, x1 ports (individual drives) * 4 ea, x4 wide ports * 2ea, x8 wide ports Connectors * Four (x4) mini-SAS HD external connectors (SFF8644) So there are 4 physical connectors. Question What is the bandwidth for each of the connectors? I would be temped to say 6Gb/s * 4, but then it mentions the "Port Configurations" and 2ea, 4ea, 16ea, which I don't understand what is. Does this mean, that the 4 physical connectors are not identical?

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• Can you use a USB hard drive in ESXI?

  - by semi

  I know that you can install ESXi 4.0 on a thumbdrive, but I was wondering if you could plug in an external harddrive to give extra storage to one of your VMs? We run a fileserver inside of ESXi that needs a space upgrade, but we're thinking of migrating to a different fileserver solution and would rather stick to external media to ease the later transition. edit: Ideally I'd like the drive to show up to the VM directly and not have ESXi control it, so that I could move it to a different machine and still have all of the data appear the same.

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• Private cloud solution [Eucalyptus,OpenStack, Nimbus] for Java deployments [Glassfish, Tomcat]

  - by Tadas D.

  I am interested in a way to have private cloud which would host Glassfish (or Tomcat) server. Which option from Eucalyptus, Openstack or Nimbus would be best to deploy java applications on it? Or maybe there is something other and I am looking wrong at the problem? The way I imagine this, that I should have some shared storage that I could expand by introducing new nodes to this cluster and have easy management for glassfish instances: something like virtual machines images that I can start and stop on demand and that image is shared among nodes. I don't need concrete step-by-step solution here but guidelines how this should be done are very welcome.

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• Does this file format exist?

  - by Jon Chase

  Is there a file format that handles the following use case... I'd like to create a tar file (or whatever - I'm just using tar here b/c it's a well known file format for containing multiple files) that would be usable even if I only had access to specific chunks of said file. For example, say I tar up my mp3 and photo collection into a 100GB tar file, then put the file into some long term storage somewhere. Later, I want to access a specific mp3 file. I don't want to download the entire 100GB tar file just to get to one mp3. In fact, let's say I can't download the entire 100GB tar file. Instead, I'd like to say "give me megabytes 10 through 19 of the 100GB tar file" and then have the mp3 magically extracted from those 10 megabytes. Does a file format like this exist?

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• Can I use a SD card as cache instead of a Solid State Drive

  - by user654628

  I just installed a solid state drive a few days ago and I have been reading about how to preserve the file of it. I am running Windows 8 and my SSD has 256G of storage. I am using a laptop and cannot carry an external hard drive connected to my laptop to hold cache, temp files etc. I was wondering if a SD card would work. So I would use the SD card to hold cache, temp files and maybe index files from Windows, would this work and be effective (since I believe sd cards will also wear out)?

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• Dedicated NIC or dedicated port for iSCSI?

  - by Newt

  When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That makes a lot of sense and I have no problem with it. The question I do have, is this - should that suggestion be taken to mean that a separate physical NIC should be used, or will a dedicated port/ports on a dual/quad port NIC be just as good? My suspicion is that simply using dedicated port(s) on a shared NIC would be just as good. Any input greatly appreciated.

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• Differencing Disks in VirtualBox

  - by PhilPursglove

  I'm struggling to understand how to do differencing disks in VirtualBox v3.1.0. I've created a Windows 2008 Server, but now I want to use that as a base image for a number of other servers. The help file has a description of what differencing disks are, but I can't find where it actually tells you how to do it. In the Storage dialog for a server I found the Differencing Disks checkbox: but when I check it, I'd expect it to then ask which image should be the parent so I could select my base image. Any pointers you can offer would be greatly appreciated!

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• Does the Win XP/7 dual boot "missing restore points" problem apply to systems with separate hard disks for each O/S?

  - by Robert Oschler

  I'm in the process of installing Windows 7/64 on a system with Windows XP/32 on it. During my research, I read about a problem that occurs in the dual boot scenario where Windows XP deletes Windows 7's restore points when it accesses the Windows 7 volume: http://support.microsoft.com/kb/926185 I found a workaround but it seems pretty painful since it appears to involve using the registry to make the Windows 7 volume appear invisible or "offline" to Windows XP, making sharing disk data between the two O/S annoying since you have to use something like an external storage device to get it done: http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html I was wondering if this problem only occurs with systems that have both O/S installed on the same physical hard drive (in different partitions)? In my case, I will have each O/S on a completely separate physical hard drive. Any other tips would be appreciated. -- roschler

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• How to create my own recommendation engine?

  - by Burak Dede

  i am intrested in recommendation engines these days and i wanna improve myself in this area.I am currently reading Programming Collective Intelligence (i think this is the best book about this subject) from OReilly (just started).But i dont have any ideas how to implement engine(what i mean by no idea dont know how to start).Lets say i have project like LastFM in my mind where do (should be implemented on database side or backend side)i start creating recommnedation engine? what level database knowledge will needed? is there any open source ones that can be used for help or any resource? what should be the first steps that i have to do?

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• Graphing new users by date in a Rails app using Seer

  - by Danger Angell

  I'd like to implement a rolling graph showing new users by day over the last 7 days using Seer. I've got Seer installed: http://www.idolhands.com/ruby-on-rails/gems-plugins-and-engines/graphing-for-ruby-on-rails-with-seer I'm struggling to get my brain around how to implement. I've got an array of the Users I want to plot: @users = User.all( :conditions = {:created_at = 7.days.ago..Time.zone.now}) Can't see the right way to implement the :data_method to roll them up by created_at date. Anyone done this or similar with Seer? Anyone smarter than me able to explain this after looking at the Seer sample page (linked above)?

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• Redirect folder to different server

  - by yuval

  I know you can redirect subdomains to a different server, but can you do the same with folders? Say I have example.com. I can redirect mysubdomain.example.com to a different server, but can I redirect example.com/mysubdomain to a different server? I'd like to host a rails app in that folder on a site that runs php while still maintaining good search engines ratings (by not creating a sub domain which in my experience in recognized as a different site). Any help? Thanks!

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• grow/shrink a zfs RAIDZ

  - by c2h2

  I'm going to build a freenas server, would like to make sure what I can do with such magical and advanced zfs. If I have 5 * 3TB disks in RAIDZ (12TB storage in total), now I am trying to add another 2 * 3TB disks to this existing array. Q: Am I able to do it without affect/touch any existing data on RAIDZ volume? What about take away some existing disk? say take away 1 disk out of the 5 disks, assuming only very small portion of data exists on the raidz.

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• How can I recover a huge folder that's been converted to a zero kb file on an NTFS partition?

  - by aalaap

  I have a 1TB drive with two 500GB partitions. One of them is being used as a Mac OS X Time Machine back up drive and the other one was NTFS and being used for storage. I had my entire 'iTunes Music' folder stored on it. Recently, there were some errors on the NTFS drive that caused chkdsk to run when in Windows, and it removed a lot of corrupt files. In this process, it converted my 'iTunes Music' folder into one zero KB file. How can I recover this? The partitions are intact and the other data on the disk is still accessible. It's just the 'iTunes Music' folder that's gone.

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• Windows Home Server style redundancy/multi-disk-support on Windows Server 2008 R2?

  - by user19597

  I'm setting up a fileserver for our department. It'll be connected to the domain. I want it to have a very large amount of storage (several TB). Ideally, it should also preserve disk space by identifying identical files and only storing them once. It should be fault tollerant so that if one of the drives fails, that drive can be replaced without losing any data. All of these features are available in Microsoft's consumer offering - Windows Home Server. However, I can't find these kind of features within the enterprise Windows Server 2008 R2. Am I missing something? I know that I could buy a Drobo, or similar, and use this instead. However, I would prefer to use a built-in feature of Windows Server should it exist. It seems surprising to me that these features should be available in Home Server but not in an enterprise fileserver.

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• Can't find my.cnf file so I can enable InnoDB - is there another way?

  - by Jared

  Hey all, I am trying to Magento running on a share server, and am having difficulty. When I look at the engines in PHPmyAdmin, I get InnoDB DISABLED. So I look in /etc/, and there is no my.cnf file. There is a ftpquota and a .boxtrapper file, but nothing else. I know I can probably create a new one, but this is a server that hosts a lot of sites. I'm afraid I will mess someone up. So is there a way to maybe create a my.cnf file that only enable InnoDB and doesn't effect anything else? Or is there another way to enable it?

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• Fail rate of EBS snapshots and AMIs?

  - by user784637

  According to Amazon the fail rate of EBS volumes is: As an example, volumes that operate with 20 GB or less of modified data since their most recent Amazon EBS snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure refers to a complete loss of the volume http://aws.amazon.com/ebs/ However, I was curious to know the fail rate of EBS snapshots and private AMIs that a system admin would take. Since the EBS snapshots and AMIs are stored in Amazon s3, is it safe to assume that the likelihood you cannot rollback to a previous snapshot or AMI the same likelihood that a file gets lost in s3? Amazon S3’s standard storage is: ... Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. http://aws.amazon.com/s3/

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• mysql spitting lots of "table marked as crashed" errors

  - by Shawn

  Hi, I have a mysql server(version: 5.5.3-m3-log Source distribution ) and it keeps showing lots of 110214 3:01:48 [ERROR] /usr/local/mysql/libexec/mysqld: Table './mydb/tablename' is marked as crashed and should be repaired 110214 3:01:48 [Warning] Checking table: './mydb/tablename' I'm wondering what can be the possible casues and how to fix it. Here is a full list mysql configuration : connect_errors = 6000 table_cache = 614 external-locking = FALSE max_allowed_packet = 32M sort_buffer_size = 2G max_length_for_sort_data = 2G join_buffer_size = 256M thread_cache_size = 300 #thread_concurrency = 8 query_cache_size = 512M query_cache_limit = 2M query_cache_min_res_unit = 2k default-storage-engine = MyISAM thread_stack = 192K transaction_isolation = READ-COMMITTED tmp_table_size = 246M max_heap_table_size = 246M long_query_time = 3 log-slave-updates = 1 log-bin = /data/mysql/3306/binlog/binlog binlog_cache_size = 4M binlog_format = MIXED max_binlog_cache_size = 8M max_binlog_si ze = 1G relay-log-index = /data/mysql/3306/relaylog/relaylog relay-log-info-file = /data/mysql/3306/relaylog/relaylog relay-log = /data/mysql/3306/relaylog/relaylog expire_logs_days = 30 key_buffer_size = 1G read_buffer_size = 1M read_rnd_buffer_size = 16M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 2G myisam_max_sort_file_size = 5G myisam_repair_threads = 1 max_binlog_size = 1G interactive_timeout = 64 wait_timeout = 64 skip-name-resolve slave-skip-errors = 1032,1062,126,1114,1146,1048,1396 The box is running on centos-5.5. Thanks for your help.

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• Nexenta/OpenSolaris filer kernel panic/crash

  - by ewwhite

  I've an x4540 Sun storage server running NexentaStor Enterprise. It's serving NFS over 10GbE CX4 for several VMWare vSphere hosts. There are 30 virtual machines running. For the past few weeks, I've had random crashes spaced 10-14 days apart. This system used to open OpenSolaris and was stable in that arrangement. The crashes trigger the automated system recovery feature on the hardware, forcing a hard system reset. Here's the output from mdb debugger: panic[cpu5]/thread=ffffff003fefbc60: Deadlock: cycle in blocking chain ffffff003fefb570 genunix:turnstile_block+795 () ffffff003fefb5d0 unix:mutex_vector_enter+261 () ffffff003fefb630 zfs:dbuf_find+5d () ffffff003fefb6c0 zfs:dbuf_hold_impl+59 () ffffff003fefb700 zfs:dbuf_hold+2e () ffffff003fefb780 zfs:dmu_buf_hold+8e () ffffff003fefb820 zfs:zap_lockdir+6d () ffffff003fefb8b0 zfs:zap_update+5b () ffffff003fefb930 zfs:zap_increment+9b () ffffff003fefb9b0 zfs:zap_increment_int+68 () ffffff003fefba10 zfs:do_userquota_update+8a () ffffff003fefba70 zfs:dmu_objset_do_userquota_updates+de () ffffff003fefbaf0 zfs:dsl_pool_sync+112 () ffffff003fefbba0 zfs:spa_sync+37b () ffffff003fefbc40 zfs:txg_sync_thread+247 () ffffff003fefbc50 unix:thread_start+8 () Any ideas what this means?

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• Why did my Cisco router hang?

  - by Mike Pennington

  We have a Cisco 1841 in our storage IDF that was originally running a 12.4(1) IP-BASE image; I wanted to upgrade to an advancedservicesk9-mz image, but the flash did not have enough space, so I deleted the running image. Later I tried inserting a larger CF from a Catalyst4500, which crashed the 1841 router (now without a bootable image). Using another 1800 series router, I loaded the 12.4(25g) advancedservicesk9 image and verified the image checksums. I set the confreg to 0x2102 from rommon and booted the new image; however the 1841 now hangs indefinitely after printing the IOS export control banner. I have tried four other images, all with the same results. What is wrong with this router? UPDATE 1: I tried loading images from a FAT16-formatted USB, but this didn't work either. I also tried tftpdnld from rommon, but got a get_mac_address(): Search T_IDPROM_MACADDR (0xc3) failed Illegal MAC address. error and the file would not load.

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• USB Thumb Drive not recognized in Hyper-V Manager

  - by Vazgen

  I have the free, standalone core Hyper-V Server 2012 running on my physical machine. I set up remote management from my Windows 8 client. When I proceed to create a virtual machine I would like to install the OS from a usb thumb drive but it is not recognized in Hyper-V Manager on my client (when the USB is plugged into the physical server) nor is it recognized in Server Manager under File and Storage Services Volumes Is there a role needed to recognize external usb flash drives? Because I think this standalone version is just core Hyper-V role and that's it... but this is such a basic functionality. Can anybody comment.

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• Find and free disk space that is unused but unavailable (due to file system error, etc.)

  - by Voyagerfan5761

  Sometimes I get the feeling that if an app such as μTorrent allocates files on my FAT32-formatted flash drive, but then is killed or crashes (as happens more than a few times a month), that space just disappears from my file system. Whether or not that is the case, sometimes I do get a chill from wondering if I've lost hundreds of MB in available storage due to carelessness or malfunctions. Checking my disk with WinDirStat just makes it worse, because I see the huge "<Unknown>" item at the disk root staring at me, eating up well over a gigabyte. It might be FS inefficiency (due to 32 or 64kb sector/cluster size and a lot of tiny files) or it might be a glitch... Is there a tool I can download and run to check my file system and make sure that there aren't any unused allocated blocks on the disk? I want to make sure I'm not losing any disk space to I/O errors, etc.

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• Symmetrix gatekeepers on Solaris 10

  - by Milner

  I have some Solaris machines that are connected to EMC Symmetrix for SAN storage. Apparently the Symm has a gatekeeper device that is used with the symmetrix CLI. We don't need the CLI, but I have these gatekeeper devices that constantly fill /var/adm/messages and the like with corrupt label errors. Is there anything I can do (short of deleting the devices on machine start) to get rid of them? Or should I just try to get our SAN guy to get the installer for the CLI? These things are getting annoying, and the devfsadmd daemon keeps rediscovering them on boot.

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• Oracle on NFS vmdk beats native NFS!?

  - by fletch00

  Hi, my colleagues are pursuing this with Netapp and Oracle - but I thought I'd post here on the off chance someone else has seen this We have a RedHat 5 VM (fully up2date) running Oracle 11i with data disks mounted via the VM's linux kernel NFS using Oracle's recommended mount options and the performance is very inconsistent (Querys that should take < 2 seconds sometimes take 60 seconds) Funny thing is we can run the same queries perfectly consistently < 2 seconds on a VMDK residing on SAME NetApp NFS datastore! Makes me wish Oracle and NetApp collaborated as closely as VMware and NetApp did on the Virtual Storage Console we used to perfectly set the NFS options and keep them in compliance... We have tried a few Linux NFS options others have posted and not seen improvement so far. We are now creating VMDK's for the VM to replace the Linux NFS mounted and workaround the issue as our developers need consistent performance ASAP.

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• Windows XP Installation issue - cannot find hard disk

  - by Marco

  A friend of mine gave me a laptop with Windows 8 installed and nothing else. I don't like it so I am trying to remove it by installing Windows XP. I have a windows XP installation CD that I have used before and worked fine, but didn't work when I tried to install it on the Windows 8 machine. It keeps telling me I don't have a drive to install to. Then I log into Windows 8 again and install check partitions. I found 2 and tried to make a new one but it will only let me make one of 69mb. Next, I tied to find a way to go back to XP with BCD install and try to set the boot loader for XP but it wasnt there. Somehow I deleted the bootloader for Windows 8 and now it asks me for a recovery tool for media. I am not familiar with the laptop specs, but it is a Toshiba with about 250GB storage, and above 1GHz processor.

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• PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

  - by Vlad

  We will be expanding the storage for a PostgreSQL server and one of the things we are considering is using SSDs (Intel 520 Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect improved performance, however we are concerned about longevity since our database usage pattern is quite write-heavy. We are also concerned about data corruption in case of power failure (due to SSDs write cache not flushing properly). We currently use RAID10 with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380 G6 server with P410 Smart Array Controller and BBWC. What makes more sense: upgrading the drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?

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