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  • RAID 50 24Port Fast Writes Slow Reads - Ubuntu

    - by James
    What is going on here?! I am baffled. serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd if=/dev/zero of=/Volumes/MercuryInternal/test/test.fs bs=4096k count=10000 10000+0 records in 10000+0 records out 41943040000 bytes (42 GB) copied, 57.0948 s, 735 MB/s serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd if=/Volumes/MercuryInternal/test/test.fs of=/dev/null bs=4096k count=10000 10000+0 records in 10000+0 records out 41943040000 bytes (42 GB) copied, 116.189 s, 361 MB/s OF NOTE: My RAID50 is 3 sets of 8 disks. - This might not be the best config for SPEED. OS: Ubuntu 12.04.1 x64 Hardware Raid: RocketRaid 2782 - 24 Port Controller HardDriveType: Seagate Barracuda ES.2 1TB Drivers: v1.1 Open Source Linux Drivers. So 24 x 1TB drives, partitioned using parted. Filesystem is ext4. I/O scheduler WAS noop but have changed it to deadline with no seemingly performance benefit/cost. serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo gdisk -l /dev/sdb GPT fdisk (gdisk) version 0.8.1 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdb: 41020686336 sectors, 19.1 TiB Logical sector size: 512 bytes Disk identifier (GUID): 95045EC6-6EAF-4072-9969-AC46A32E38C8 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 41020686302 Partitions will be aligned on 2048-sector boundaries Total free space is 5062589 sectors (2.4 GiB) Number Start (sector) End (sector) Size Code Name 1 2048 41015625727 19.1 TiB 0700 primary To me this should be working fine. I can't think of anything that would be causing this other then fundamental driver errors? I can't seem to get much/if any higher then the 361MB a second, is this hitting the "SATA2" link speed, which it shouldn't given it is a PCIe2.0 card. Or maybe some cacheing quirk - I do have Write Back enabled. Does anyone have any suggestions? Tests for me to perform? Or if you require more information, I am happy to provide it! This is a video fileserver for editing machines, so we have a preference for FAST reads over writes. I was just expected more from RAID 50 and 24 drives together... EDIT: (hdparm results) serveradmin@FILESERVER:/Volumes/MercuryInternal$ sudo hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 17458 MB in 2.00 seconds = 8735.50 MB/sec Timing buffered disk reads: 884 MB in 3.00 seconds = 294.32 MB/sec EDIT2: (config details) Also, I am using a RAID block size of 256K. I was told a larger block size is better for larger (in my case large video) files. EDIT3: (Bonnie++ Results. Would love some guidance with this!)

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  • What are the functionalities of Distributed File systems and Distributed Storage Systems?

    - by Berkay
    i'm reading cloud vendors solutions for the distributed storage systems such as Amazon Dynamo and Google Big Table. and really confused in two terms : what is Distrubuted file systems for in cloud ? what is Distributed storage systems for? what are differences of these terms and functionalities ? if i understand these terms i will create the general architecture of the cloud vendors, any good tutorial or web page will be appreciated. Thanks

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  • LVS Configuration issue (Using piranha Tool)

    - by PravinG
    I have configured LVS on cent os using piranha tool .I am using vip of internal n/w as gateway for real server we have two NIC one having exteranl Ip and other for internal n/w which is on 192.168.3.0/24 network. But I am not able to connect from client it shows connection refused error . Please suggest iptables rules for private n public n/w to communicate. May be I am missing this . Iptables rules that we have added are : iptables -t nat -A POSTROUTING -p tcp -s 192.168.3.0/24 --sport 5000 -j MASQUERADE this is my ipconfig: eth0 Link encap:Ethernet HWaddr 00:00:E8:F6:74:DA inet addr:122.166.233.133 Bcast:122.166.233.255 Mask:255.255.255.0 inet6 addr: fe80::200:e8ff:fef6:74da/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:94433 errors:0 dropped:0 overruns:0 frame:0 TX packets:130966 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:9469972 (9.0 MiB) TX bytes:19929308 (19.0 MiB) Interrupt:16 Base address:0x2000 eth0:1 Link encap:Ethernet HWaddr 00:00:E8:F6:74:DA inet addr:122.166.233.136 Bcast:122.166.233.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Base address:0x2000 eth1 Link encap:Ethernet HWaddr 00:E0:20:14:F9:2D inet addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0 inet6 addr: fe80::2e0:20ff:fe14:f92d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:123718 errors:0 dropped:0 overruns:0 frame:0 TX packets:148856 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:18738556 (17.8 MiB) TX bytes:11697153 (11.1 MiB) Interrupt:17 Memory:60000400-600004ff eth1:1 Link encap:Ethernet HWaddr 00:E0:20:14:F9:2D inet addr:192.168.3.10 Bcast:192.168.3.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:17 Memory:60000400-600004ff eth2 Link encap:Ethernet HWaddr 00:16:76:6E:D1:D2 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:21 Base address:0xa500 and ipvsadm -ln command [root@abts-kk-static-133 ~]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 122.166.233.136:5000 wlc TCP 122.166.233.136:5004 wlc lvs server routing table Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 122.166.233.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 eth1 0.0.0.0 122.166.233.1 0.0.0.0 UG 0 0 0 eth0 real 1 real 2 we have configured various ports from 5000:5008 . Do we need to this iptables for all ports? Suggest me how should I solve this issue.

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  • MS Access split database queries

    - by Lance Roberts
    When the frontend of a MS Access db queries a MS Access backend on another machine over the network, does it pull in the whole table/database/file, or does it have some way of extracting just what it needs from the backend, thereby lessening network load.

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  • How to declutter and organize the cables on and under my desk?

    - by splattne
    Computer cables and external devices are a continuous source of frustration for everybody who likes a clean working environment. The more devices you add to your home office, the more disastrous the situation under the table becomes: cords falling behind the desk, ugly cables running along the sides and under of the desk, making it almost impossible to clean and remove the dust. This is not my office, but I've seen similar "setups:" I'm looking for good tips/products which help me in keeping the all cables somehow under control and organized. Thanks!

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  • How to remove iso 9660 from USB?

    - by a_m0d
    I have somehow managed to write an iso 9660 image onto my USB drive, which makes all my computer think that the device is actually a CD. I have tried various methods of removing this partition, but nothing seems to work. I have tried fdisk, which says $ fdisk -l /dev/sdb Cannot open /dev/sdb parted crashes when I try to use it on this device. I have even tried $ dd if=/dev/zero of=/dev/sdb but it just hangs with no output (either on screen or on disk). However, when I plug the USB in, it does mount, and I can view (but not edit) the files on it. edit: now the result is $ dd if=/dev/zero of=/dev/sdb dd: opening `/dev/sdb': Read-only file system I have also tried re-formatting it on Windows, but it gets to the end of the format process and then says "Couldn't format the drive". How can I remove this partition and get my whole USB drive back to normal again? EDIT 1: Trying a simple mkfs doesn't work: $ sudo mkfs -t vfat /dev/sdb mkfs.vfat 3.0.0 (28 Sep 2008) mkfs.vfat: Will not try to make filesystem on full-disk device '/dev/sdb' (use -I if wanted) I can't do mkfs on /dev/sdb1 because there is no such partition, as shown:$ ls /dev | grep sdb sdb EDIT 2: This is the information posted by dmesg when I plug the device in:$ dmesg . . (snip) . usb 2-1: New USB device found, idVendor=058f, idProduct=6387 usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 2-1: Product: Mass Storage usb 2-1: Manufacturer: Generic usb 2-1: SerialNumber: G0905000000000010885 usb-storage: device found at 4 usb-storage: waiting for device to settle before scanning usb-storage: device scan complete scsi 6:0:0:0: Direct-Access FLASH Drive AU_USB20 8.07 PQ: 0 ANSI: 2 sd 6:0:0:0: [sdb] 4069376 512-byte hardware sectors (2084 MB) sd 6:0:0:0: [sdb] Write Protect is off sd 6:0:0:0: [sdb] Mode Sense: 03 00 00 00 sd 6:0:0:0: [sdb] Assuming drive cache: write through sd 6:0:0:0: [sdb] 4069376 512-byte hardware sectors (2084 MB) sd 6:0:0:0: [sdb] Write Protect is off sd 6:0:0:0: [sdb] Mode Sense: 03 00 00 00 sd 6:0:0:0: [sdb] Assuming drive cache: write through sdb: unknown partition table sd 6:0:0:0: [sdb] Attached SCSI removable disk sd 6:0:0:0: Attached scsi generic sg2 type 0 ISO 9660 Extensions: Microsoft Joliet Level 3 ISO 9660 Extensions: RRIP_1991A SELinux: initialized (dev sdb, type iso9660), uses genfs_contexts CE: hpet increasing min_delta_ns to 15000 nsec This shows that the device is formatted as ISO 9660 and that it is /dev/sdb. EDIT 3: This is the message that I find at the bottom of dmesg after running cfdisk and writing a new partition table to the disk:SELinux: initialized (dev sdb, type iso9660), uses genfs_contexts sd 17:0:0:0: [sdb] Device not ready: Sense Key : Not Ready [current] sd 17:0:0:0: [sdb] Device not ready: < ASC=0xff ASCQ=0xffASC=0xff < ASCQ=0xff end_request: I/O error, dev sdb, sector 0 Buffer I/O error on device sdb, logical block 0 lost page write due to I/O error on sdb

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  • How to monitor traffic on certain ports with ntop

    - by Claudiu
    How to configure ntop so I can get the amount of upload traffic sent through a certain port ? I've added port in ntop/protocol.list, restarted ntop and after some time I've checked Summary - Traffic - TCP/UDP Traffic Port Distribution: Last Minute View, but data from that table is not too relevant. I think there is much more about this ntop that I don't know (configuration, usage).

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  • How to reset KDE System Monitor (KSysGuard)

    - by Deltik
    Something went wrong while I was attempting to restore a backup, and KDE System Guard ceased to display properly. This is the correct display (command running from root: kdesudo ksysguard): This is the incorrect display (command: ksysguard): Here in the incorrect display, the menu bar is missing, and the tab "Process Table" is unclickable. I have already tried to remove the directory ~/.kde/share/apps/ksysguard/ but to no avail. My question: How do I restore KSysGuard back to factory defaults/normal functionality?

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  • fdisk (Linux) partitioning RAID 0

    - by Silverrocker
    I'm trying to create partitions for a Slackware installation on my computer (beside Windows 7) just to have a nice distribution running mostly for school but when I run fdisk and print the partition table I get the following message: Partition x does not end on cylinder boundary. (In my case x = 1, just using x to help googlers.) I must say I'm using a RAID card (AMCC 3ware 9500S SATA RAID Controller). Maybe this is the problem. How can I fix this without losing any data?

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  • MYSQL Installation Problem...

    - by Gopal
    I was downloaded the MYSQL from this link http://dev.mysql.com/downloads/mysql/ But i cannot able to find the Installation file... How to create database & Table in mysql? It will work like SQL server or ? Need Help

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  • What email server should I choose?

    - by DCC
    I need a secure email server installed in debian-lenny with users in a mysql table. Also users are from multiple domains. Quota should be in mysql or a global variable for all users. What are my options ? THanks in advance for your help.

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  • Fortigate 80C multi wan

    - by emamdouh
    I've Fortigate 80c and two internet lines from two separate ISPs. I'm trying to distribute sessions between both internet lines following http://docs-legacy.fortinet.com/cb/html/index.html#page/FOS_Cookbook/Install_advanced/routing_ecmp_basic.html , but it seems connections go through just one of two internet lines. I have "wan1 as it's configured first, and I could edit static route table to be wan2 instead of wan1", but not both of internet lines I have. Any ideas why this happens? Thanks in advance

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  • Why won't vyatta allow SMTP through my firewall?

    - by Solignis
    I am setting up a vyatta router on VMware ESXi, But I see to have hit a major snag, I could not get my firewall and NAT to work correctly. I am not sure what was wrong with NAT but it "seems" to be working now. But the firewall is not allowing traffic from my WAN interface (eth0) to my LAN (eth1). I can confirm its the firewall because I disabled all firewall rules and everything worked with just NAT. If put the firewalls (WAN and LAN) back in place nothing can get through to port 25. I am not really sure what the issue could be I am using pretty basic firewall rules, I wrote the rules while looking at the vyatta docs so unless there is something odd with the documentation they "should" be working. Here is my NAT rules so far; vyatta@gateway# show service nat rule 20 { description "Zimbra SNAT #1" outbound-interface eth0 outside-address { address 74.XXX.XXX.XXX } source { address 10.0.0.17 } type source } rule 21 { description "Zimbra SMTP #1" destination { address 74.XXX.XXX.XXX port 25 } inbound-interface eth0 inside-address { address 10.0.0.17 } protocol tcp type destination } rule 100 { description "Default LAN -> WAN" outbound-interface eth0 outside-address { address 74.XXX.XXX.XXX } source { address 10.0.0.0/24 } type source } Then here is my firewall rules, this is where I believe the problem is. vyatta@gateway# show firewall all-ping enable broadcast-ping disable conntrack-expect-table-size 4096 conntrack-hash-size 4096 conntrack-table-size 32768 conntrack-tcp-loose enable ipv6-receive-redirects disable ipv6-src-route disable ip-src-route disable log-martians enable name LAN_in { rule 100 { action accept description "Default LAN -> any" protocol all source { address 10.0.0.0/24 } } } name LAN_out { } name LOCAL { rule 100 { action accept state { established enable } } } name WAN_in { rule 20 { action accept description "Allow SMTP connections to MX01" destination { address 74.XXX.XXX.XXX port 25 } protocol tcp } rule 100 { action accept description "Allow established connections back through" state { established enable } } } name WAN_out { } receive-redirects disable send-redirects enable source-validation disable syn-cookies enable SIDENOTE To test for open ports I have using this website, http://www.yougetsignal.com/tools/open-ports/, it showed port 25 as open without the firewall rules and closed with the firewall rules. UPDATE Just to see if the firewall was working properly I made a rule to block SSH from the WAN interface. When I checked for port 22 on my primary WAN address it said it was still open even though I outright blocked the port. Here is the rule I used; rule 21 { action reject destination { address 74.219.80.163 port 22 } protocol tcp } So now I am convinced either I am doing something wrong or the firewall is not working like it should.

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  • How do I combine static and dynamic DHCP leases on a Cisco router?

    - by Brad
    Basically, what I need is super similar to the unanswered cisco forum question below: https://supportforums.cisco.com/message/3139749#3139749 I have a Cisco 850 Series router. I have configured a DHCP pool for the 10.0.0.0/24 network. I have excluded 10.0.0.1 - 10.0.0.99 from the DHCP pool. I want to add a static DHCP pool for stuff and I want DHCP to statically assign them the addresses of my choice below 100. Actually, I don't care what addresses I statically assign. They can be anything in the pool for all I care, I just want it to work. Why are you doing this? Just statically assign the IPs on the devices! I don't want to do this because I have some laptop users. They could obviously only use that static IP here. This isn't a problem if they could be bothered to change any location setting or something. They can't. So it HAS to be DHCP. It also has to be static IPs because I need to forward ports to them. I know, I know, this is weird but it's an apartment LAN/WLAN so this isn't exactly a typical use case. Relevant sections of config below: ip dhcp excluded-address 10.0.0.1 10.0.0.99 ! ip dhcp pool Internal-net import all network 10.0.0.0 255.255.255.0 default-router 10.0.0.1 domain-name 1770.local lease 7 ! ip dhcp pool static-pool import all origin file flash://staticmap default-router 10.0.0.1 domain-name 1770.local Contents of staticmap: *time* Aug 5 2010 09:00 AM *version* 2 !IP address Type Hardware address Lease expiration 10.0.0.100/24 1 001f.5b3e.d50a Infinite *end* You can see here I was trying addresses outside the excluded-address range to see if that would make any difference. My testing machine's MAC: mainframe:~ brad$ ifconfig en1 en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:1f:5b:3e:d5:0a What shows up in the DHCP binding table: basestar#show ip dhcp binding Bindings from all pools not associated with VRF: IP address Client-ID/ Lease expiration Type Hardware address/ User name 10.0.0.112 0100.1f5b.3ed5.0a Aug 12 2010 10:06 AM Automatic What's up with the funny looking MAC in the DHCP binding table?? Is what I'm trying to accomplish basically impossible? Am I going about this the wrong way? All I want to to be able to port forward some ports to specific devices. The way I would do this with a consumer router is to do what I'm trying to do here; assign static DHCP to those devices then configure PAT for ports on those addresses.

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  • filesystem mounting problem

    - by user306988
    Hello, A DAS box is attached to my linux box using LSI SCSI HBA. Volume is properly detected on the linux box and filesystem is created using mkfs.ext2 /dev/sdc #No partition table I can not mount the volume using mount/dev/sdc /mnt/temp -t ext3 But I can mount it using mount /dev/sdc /mnt/temp -t ext3 -o loop Can anybody please tell me what "-o loop" option does internally? Has anybody faced this option before? Thanks in advance, prashant

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  • Windows 8 ignores more specific route

    - by Lander
    OS: Windows 8 I have a cabled NIC (connected to router with ip 192.168.1.0) and a WIFI NIC (connected to a router with ip 192.168.1.1) . I want all traffic to go through the cabled NIC, except the 192.168.1.0/8 range should use the wifi-nic. This was working fine in Windows 7, without any manual configuration. In Windows 8 however, it's not. My routing table: =========================================================================== Interface List 14...f2 7b cb 13 e7 f0 ......Microsoft Wi-Fi Direct Virtual Adapter 13...b8 ac 6f 54 d2 5c ......Realtek PCIe FE Family Controller 12...f0 7b cb 13 e7 f0 ......Dell Wireless 1397 WLAN Mini-Card 1...........................Software Loopback Interface 1 15...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 16...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.198 30 0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.233 20 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.0.0 255.255.255.0 On-link 192.168.0.233 276 192.168.0.233 255.255.255.255 On-link 192.168.0.233 276 192.168.0.255 255.255.255.255 On-link 192.168.0.233 276 192.168.1.0 255.255.255.0 192.168.1.1 192.168.1.198 31 192.168.1.198 255.255.255.255 On-link 192.168.1.198 286 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.0.233 276 224.0.0.0 240.0.0.0 On-link 192.168.1.198 286 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.0.233 276 255.255.255.255 255.255.255.255 On-link 192.168.1.198 286 =========================================================================== Persistent Routes: None I added the rule for 192.168.1.0. I would think Windows should use this rule for the IP 192.168.1.1 because it's more specific than the default-route. However it's not: C:\Windows\system32>tracert 192.168.1.1 Tracing route to 192.168.1.1 over a maximum of 30 hops 1 58 ms 4 ms 4 ms 192.168.0.1 2 68 ms 12 ms 11 ms ^C So... What do I do wrong? And how can I make Windows use the wireless NIC for 192.168.1.0/8

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  • What email server should I choose?

    - by DCC
    I need a secure email server installed in debian-lenny with users in a mysql table. Also users are from multiple domains. Quota should be in mysql or a global variable for all users. What are my options ? THanks in advance for your help.

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