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kzch

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    Expanding SHR, not able to add one of same smaller disks

    in General Post-Installation Questions/Discussions (non-hardware specific)

    Posted

    admin@KCDSM:~$ sudo fdisk -l

    Disk /dev/sdb: 931.5 GiB, 1000200658432 bytes, 1953516911 sectors
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: dos
    Disk identifier: 0x0001d505

    Device     Boot   Start        End    Sectors   Size Id Type
    /dev/sdb1          2048    4982527    4980480   2.4G fd Linux raid autodetect
    /dev/sdb2       4982528    9176831    4194304     2G fd Linux raid autodetect
    /dev/sdb3       9437184 1953511007 1944073824   927G  f W95 Ext'd (LBA)
    /dev/sdb5       9453280 1953302175 1943848896 926.9G fd Linux raid autodetect


    Disk /dev/sdf: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: dos
    Disk identifier: 0x77dfc2e7

    Device     Boot   Start        End    Sectors   Size Id Type
    /dev/sdf1          2048    4982527    4980480   2.4G fd Linux raid autodetect
    /dev/sdf2       4982528    9176831    4194304     2G fd Linux raid autodetect
    /dev/sdf3       9437184 1953511007 1944073824   927G  f W95 Ext'd (LBA)
    /dev/sdf5       9453280 1953318239 1943864960 926.9G fd Linux raid autodetect

    Expanding SHR, not able to add one of same smaller disks

    in General Post-Installation Questions/Discussions (non-hardware specific)

    Posted

    Also, I have two more 3T drives connected to this same LSI SAS card, and the add drive command is available. But when adding, only those two 3T drives were available to be added to this pool, not the 1T drive. I later added these two drives to a different pool just to make then unavailable for this pool, then the add drive command is greyed again.

    Expanding SHR, not able to add one of same smaller disks

    in General Post-Installation Questions/Discussions (non-hardware specific)

    Posted · Edited by kzch

    Hi, 

     

    I have DSM 6 with a SHR storage pool of 5 disks (1T, 1.5T, 1.5T, 2T, 3T). I am trying to add another 1T (exact same model as the other 1T) to it, but the add command is grayed out, so not able to add. 

     

    The Synology help located here says that 1T should be able to be added to such SHR configuration. So I am confused. Anyone can help?

     

    Thanks in advance!

     

    XPEnology DS3612xs DSM 4.3 build 3827 (ESXi v1.2)

    in DSM 5.2 and earlier (Legacy)

    Posted

    Hi, all,

     

    This is my first post. I have learned a lot from this forum, and really appreciate all the hardwork by the experts here.

     

    Now having a new box with Asrock H87M-Pro4/Pentium G3220, running ESXi 5.1 and this DSM 4.3 VM. Everything is good except the USB3 HDD performance in the VM is same as USB2 HDD. The VM has xHCI USB controller which is supposed to support USB3.

     

    When I start the DSM from the usb stick so it is running in physical machine, the USB3 HDD (WD Mybook 2TB) get 107.82 MB/s:

     

    $ hdparm -tT /dev/sdy

    /dev/sdy:

    Timing cached reads: 15296 MB in 2.00 seconds = 7665.84 MB/sec

    Timing buffered disk reads: 324 MB in 3.00 seconds = 107.82 MB/sec

     

    $ time sh -c "dd if=/dev/zero of=test bs=1048576 count=2048 && sync"

    2048+0 records in

    2048+0 records out

    real 0m 19.60s <------write speed=2048/19.6=104MB/s

    user 0m 0.01s

    sys 0m 0.61s

    (USB2 HDDs get ~41MB/s for hdparm, and 48~55sec (37~42MB/s) for dd test)

     

    But when I try the same tests in the DSM VM, the USB3 HDD has same speed as USB2 HDDs:

    $ hdparm -tT /dev/sdu

     

    /dev/sdu:

    Timing cached reads: 11232 MB in 2.00 seconds = 5625.18 MB/sec

    Timing buffered disk reads: 94 MB in 3.00 seconds = 31.33 MB/sec <--- all USB2 and USB3 HDDs are similar

     

    $ time sh -c "dd if=/dev/zero of=test bs=1048576 count=2048 && sync"

    2048+0 records in

    2048+0 records out

    real 1m 11.01s <--- all USB2 and USB3 HDDs are similar

    user 0m 0.00s

    sys 0m 0.86s

     

    Can someone point me to the right direction to fix the USB3 performance in the VM? Thanks a lot in advance.

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