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  • Exchange 2007 + mailbox role - performance counters

    - by Ankh2054
    I hve two exchange server in my org. Exchange 2007 - mailbox role Exchange 2007 client access, transport role I am trying to monitor the following performance counter on my exchange 2007 server (mailbox role) MSExchange Database(Information Store)\Database Page Fault Stalls/sec But I cant find the counter anywhere. I have checked the version of exchange an its 8.3.6 I looked on the other server in case I had it mixed up, but its not here either. Can anyone shed some light ?

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  • Portable hard disk with write-protect switch

    - by Wadih M.
    Hi, I'm looking for portable hard disks that have a physical switch (with or without key) to make it "read only" to prevent modification. Is there a particular keyword I should look for that designate those types of drives, or models I can look into, anything that can guide me will help. Thanks

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  • Shopping for Fast USB Flash Drives

    - by Jim McKeeth
    I would like to pick up some really fast USB flash drives in the 16 - 64 GB range. When looking at drives they just list their size, their form factor (key chain hook, slider, etc.) and the fact that they are all Hi-Speed USB 2.0. It seems like I have heard that different drives have different performance and life expectancy. The sales guy tells me that they are all the same performance any more, but it wouldn't be the first time a sales guy had the wrong technical details. Our objective is to run Virtual PC images off of them, so good speed and resilience to rewrites it important.

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  • Windows 7 Home Premium Disk Partitioning

    - by Tamir
    Hi all, I'm having new Dell studio 1749 laptop with one partition (C). there is another backup partition - hidden. How can I create new partition for all the files and the other stuff to be seperated from the C partition? I'm looking for a clean and simple way to do it, thanks!

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  • Disk Management Hidden Partitions - PTEDIT32

    - by Kairan
    Apparently PTEDIT32 can edit partitions, making partitions that are hidden, visible. My purpose is to take a hidden partition on a toshiba laptop (the recovery partition) and copy it as my hard drive is beginning to fail. My problem, is that I cannot find PTEDIT32 documentation on what i want to change the partition # to. I know that changing it from 27 to 7 would change it from hidden to active - but if I set it to active, I am worried it will try to launch the recovery mode (as that is what it did on a previous laptop) Here is the link I used for instructions to do this on a previous laptop: Hidden_Recovery_Link_Site So how to make the hidden partition visible without it actually RUNNING the recovery mode?

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  • NVRAM for journals on Linux?

    - by symcbean
    I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just write caching unless of course I just disable the journal with the write cache (after all devicemapper doesn't seem to support barriers). In order to get the benefits from using a BB write cache on the controller, then I'd need to disable journalling - but then the OS should try to fsck the system after an outage. Of course if the OS knows what's in the batter-backed memory then it could use it as the journal - but that means it must be exposed as a block device and only be under the control of the operating system. However I've not been able to find a suitable low-cost device (no, write-levelling for Flash is not adequate for a journal, at least one which uses Smartmedia). While there's no end of flash devices, disk/array controllers with BB write caches, so far I've not found anything which just gives me non-volatile memory addressable as a block storage device.

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  • Which is faster for read access on EC2; local drive or EBS?

    - by Phillip Oldham
    Which is faster for read access on an EC2 instance; the "local" drive or an attached EBS volume? I have some data that needs to be persisted so have placed this on an EBS volume. I'm using OpenSolaris, so this volume has been attached as a ZFS pool. However, I have a large chunk of EC2 disk space that's going to go unused, so I'm considering re-purposing this as a ZFS cache volume but I don't want to do this if the disk access is going to be slower than that of the EBS volume as it would potentially have a detrimental effect.

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  • SQL Server 2008 - Performance impact of transactional replication?

    - by cxfx
    I'm planning to set up transactional replication for a 100Gb SQL Server 2008 database. I have the distributor and publisher on the same server, and am using push subscription. Should there be a performance impact on my publisher server when it creates the initial snapshot, and synchronises it with a subscriber? From what I've tried so far on a staging server, it seems to slow right down. Is there a better way to create the initial snapshot without impacting my production publisher server?

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  • Recommended Setup

    - by Chris Ryan
    I have been running into issue with my MSSQL Database setup with speed. Here is my scenario. About 100M Rows Average: 1k Updates Per Second Hard Drives: RAID 10 SSD MDF --Active Time: 0 Log Drives: 1 SSD LDF - Simple Recovery --Active Time 99.9 --Queue: 8 I do not need a back up of the log so it is set to simple recovery but my bottleneck is still at my log. I get high WAITLOG times and thus it can not update any faster. I can't do bulk updates/transactions and each update needs to be one at a time. Is my only option to increase write performance of the log drives, add a RAID drives? Any suggestions on increasing the performance?

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  • Computer cannot detect hard disk

    - by Nrew
    Details: BIOS: AMI Bios, set primary master to Auto OS: Windows XP Sp2 Memory: 384 Mb Processor: Pentium 3 yeah this one is really very old. And some of the capacitors in the motherboard are already bulging. It detected the hdd yesterday when were trying to fix it and install xp. But today it cannot boot and said: Boot failure. What can you suggest that I would do to revive this old machine. What would be the problem, is it the hdd, the ide cable or the motherboard.

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  • Disk Partitioning problem with fdisk.

    - by MA1
    Currently i am using fdisk to create/resize windows partitions. Following is a sample input script to fdisk to create/resize windows partitions: fdisk /dev/sda < partInput the contents of partInput are as follows: d #delete the partition 3 #partition number to be deleted n #add a new partition p #primary: type of new partition 3 #new partition number 18804 #start cylinder of new partition 77433 #end cylinder of new partition t #change the type of partition 3 #partition number whose type(filesystem) is to be changed 7 #HPFS/NTFS: partition type(filesystem) n #add a new partition p #primary: type of partition 77434 #first cylinder of new partition 77825 #end cylinder new partition w #write all the above changes As you see in the above input we are using cylinders for start and end. Earlier i am using sectors as unit and everything is working fine but getting problems when partitioning a 1.5TB hard drive. Then i changed the unit to cylinders but it is working on some machines not all. On some machines fdisk failed to create the partition table correctly. So, i am thinking to move to parted if there is no way to do the above using fdisk. Please also tell me how to correctly convert sectors to cylinders? How to perform all the above steps using parted without losing the data OR how to use fdisk correctly?

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  • Disable disk caches in AWS EBS for PostgreSQL?

    - by Alexandr Kurilin
    It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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  • Which events specifically cause Windows 2008 to mark a SAN volume offline?

    - by Jeremy
    I am searching for specific criteria/events that will cause Windows 2008 to mark a SAN volume as offline in disk management, even though it is connected to that SAN volume via FC or iSCSI. Microsoft states that "A dynamic disk may become Offline if it is corrupted or intermittently unavailable. A dynamic disk may also become Offline if you attempt to import a foreign (dynamic) disk and the import fails. An error icon appears on the Offline disk. Only dynamic disks display the Missing or Offline status." I am specifically wondering if, on the SAN, changing the path to the disk (such as the disk being presented to the host via a different iSCSI target IQN or a different LUN #) would cause a volume to be offlined in disk management. Thanks! Edit: I have already found two reasons why a disk might be set offline, disk signature collisions and the SAN disk policy. Bounty would be awarded to someone who can find further documented reasons related to changes in the volume's path. Disk signature collisions: http://blogs.technet.com/b/markrussinovich/archive/2011/11/08/3463572.aspx SAN disk policy: http://jeffwouters.nl/index.php/2011/06/disk-offline-with-error-the-disk-is-offline-because-of-a-policy-set-by-an-administrator/

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  • Battery backed write cache behavior upon disk change

    - by Halfgaar
    We use 3ware Inc 9650SE SATA-II RAID PCIe RAID controllers with battery backed write cache. Our spare hardware has the same controller. I was wondering; are these controllers smart enough not to sync the cache when the disks have been changed? For example, if I deploy one of those spare machines by putting in the disks of another machine and that spare machine still has pending writes, will it be smart enough not to perform those writes on the replaced array? Edit: my scenario is not really made clear, so let me give an example: server1 goes down because of power supply failure. I put the disks in server2 and start. I repair server1 I put the disks back from server2 in server1 (it's not relevant right now that in reality I would probably keep server2 running). If server1 doesn't have safeguards, it will write to the array, thinking it's simply powering up again, corrupting it.

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  • hp DL380 G4 won't boot with disk plugged into front USB

    - by Kev
    We outgrew a few older external USB backup drives, and purchased WD My Passport 1 TB USB 3.0 drives to replace them. When they are plugged into the front of our G4, it will blink forever after the BIOS (which is current, BTW) and never boot, even though the USB disks are not "bootable" per se. Our old drives did not exhibit this behaviour (so I don't think it's this type of issue that I've read about other servers.) The old drives were USB 2.0, but this shouldn't make a difference, AFAICT--the specs say all of the G4's USB ports are the same, 2.0, anyway, so I'm not sure how one port would handle a USB 3.0 device better than another. If we plug the new drives in one of the back slots, it boots fine. What's the cause? My concern is that the front USB port, and possibly the motherboard, might be starting to die. (We are experiencing other strange issues with them, or were initially, like intermittent file permissions errors despite wide-open ACL on these local drives, but some serverfault users have me convinced they may be coincidental software/security related issues.)

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  • How to recover data from software RAID 5 disk partition

    - by Ali n
    I have CentOS 5.8 on my computer, with 5x 1TB hard drives. I used software RAID. (RAID 1 as a boot partition md0, RAID 0 as a root partition md1 and RAID 5 as /home partition md3). Unfortunately one of these hard drives failed lately and I want to replace it with a new one. I want to know that is it possible to change this hard drive without data loss? The important partition is RAID 5 so in theory if one of hard drives failed I should be able to recover its data without any problem. But in practice how can I do that?

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  • Suggestion for boot manager in external hard disk

    - by Korrupzion
    Hi, I just bought an 1TB External Hard drive with eSATA, USB, FW400/800 (LaCie if you are interested). I already put the windows 7 installation in a FAT32 active partition so i can plug the HDD via USB, since my notebook or other computers doesn't support boot via eSATA commonly, and it works. Now i want to do more partitions so i'm looking for a way to have a boot manager as active partitions that allows me to boot from different partitions in my HDD (win7, ubuntu installations for example) I want to know if you know any software to do this or you already have this system. Thanks and sorry i have too many grammar errors because english is not my native language :)

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  • linux: mount old ATA disk to USB adapter

    - by 130490868091234
    I am trying to recover data from an old Linux that was installed in a computer on an ATA hard drive. I found a ScanLogic Corp. SL11R-IDE IDE Bridge (04ce:0002), an ATA adapter to USB 1.0 like the one in the picture: and after switching it on, I plugged it into a laptop with Ubuntu 12.04. I am used to the drives being automatically mounted, but this one doesn't show up in /media. After doing a dmesg, all I got is this: [215298.671924] usb 2-1.1: new full-speed USB device number 5 using ehci_hcd [215298.767330] scsi19 : usb-storage 2-1.1:1.0 [215299.841701] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.017258] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.197050] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.372730] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd I tried plugging in the adapter to the three different USB ports in my laptop (one of them USB 3.0), but got no luck with any of them. I get different devices under, for example: /dev/bus/usb/003/002 or /dev/bus/usb/002/004, but I don't get any /dev/sdbN links. The output blkid -o list -c /dev/null is just the laptop's partitions. I have tried taking out the jumper, putting it as master and as CS Enabled, but didn't change the result. Any ideas?

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  • Possible to write an implement of RAIDZ or RAIDZ2 for the MD driver in the Linux kernel?

    - by Pharaun
    I am curious on if it is possible to have an implement of RAIDZ and/or RAIDZ2 in the MD driver in the Linux kernel? From my understanding of it is that the RAIDZ version is equivalent to a RAID 5, and that a RAIDZ2 is equivalent to a RAID 6. The main difference is that the stripe size can be variable for RAIDZ as opposite to RAID 5/6 from my understanding, which helps performance. So what I am wondering is would it be possible to add this performance enhancing technique to RAID 5 & 6 in the MD driver in the kernel? Or is it tied too closely to how the ZFS works?

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  • CentOS default installation gave 60% disk space to tmpfs partition

    - by garconcn
    I installed a CentOS server which will be used for xen hypervisor. The server has two Intel(R) Xeon(R) CPU E5620 and 148G memory. The OS was installed on a 120G SSD drive. After the installation, I found that the tmpfs partition occupied about 60% of the drive. Even though I don't need much space for the OS, will there be any problem with 71G tmp partition? Thanks for any comment. [root@cloud ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 55G 1.1G 51G 3% / /dev/sda1 99M 13M 82M 14% /boot tmpfs 71G 0 71G 0% /dev/shm

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  • Convert partition to Virtual Disk image

    - by Rick
    I have a 250 GB HD with a XP partition. I partitioned the XP Box to 112 GB, since the max Virtual PC can load is 127 GB. I have a new motherboard and can't load into the partition, so I am using Windows 7. I have tried using WinImage to create the image but it creates an image of the whole disc (250 GB) and will not load on Virtual PC cause of the size limit. What would be best to convert to VHD correctly?

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