kzch

I see that now. The difference is 4MB for a 1T drive. Thanks.

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

not that I know of. In fact, I could create a storage pool and volume with drive 2 alone. It finished ok.

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.

ESXi 6.7u2. All disks are connected on a LSI SAS 9707-8i pci-e card. The LSI SAS card is pci pass-through to the VM. See the pics, drives 3,4,6,9,10 are part of the storage pool. drive 2 is what I want to add to the pool. It is same model as as drive 6 Add drive command is greyed.

Jun's 1.04b DS918+ in ESXi. Latest DSM 6.

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!

Is this still needed if I am using ESXi? My ESXi is on a Intel pentium G3220.

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.