similar to: 7.0-Release and 3ware 9550SXU w/BBU - horrible write performance

I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives. OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled On the first server I have decent performance. Nothing spectacular, but good enough. The second one

I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives. OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled On the first server I have decent performance. Nothing spectacular, but good enough. The second one

Has anyone worked with a x4500/x4540 and know if the internal raid controllers have a bbu? I''m concern that we won''t be able to turn off the write-cache on the internal hds and SSDs to prevent data corruption in case of a power failure. -- This message posted from opensolaris.org

Hi, I used xen-3.0.2-2 (2.6.16) before and the performance of my 3ware 9550SXU-4LP wasn''t too bad, but now with 3.0.3.0 (2.6.16.29) throughput decreased by about 10MB/sec in write performance. sync; ./bonnie++ -n 0 -r 512 -s 20480 -f -b -d /mnt/blabla -u someuser now (2.6.16.29): Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per

Hi Guys, Has somebody encountered (significantly) different read/write speeds when using gmirror? I have 2xWD WD30EFRX RED drives which are configured as follows: $ gmirror status Name Status Components mirror/root COMPLETE ada0p2 (ACTIVE) ada1p2 (ACTIVE) mirror/data COMPLETE ada0p4 (ACTIVE) ada1p4 (ACTIVE) mirror/root is mounted

Hello listmates, I would like to build a 12-15 TB RAID 5 data server to run under ContOS. Any recommendations as far as hardware, configuration, etc? Thanks. Boris.

Hello all! I have a 512 MB Kingston flash disk. When I try to create a partition with 460 MB (471.040 KB), the partition is created with 460.6 MB (471.665 KB). ------------------------------------------------ Device Boot Start End Blocks Id System /dev/sdb1 1 951 471665 83 Linux ------------------------------------------------ Why?

Hello, I have Cisco CallManager 3.3.4 and Asterisk@Home latest version. I have earlier tried getting Asterisk to register with CCM via H323 and failed. Back then, I learned that this is a known bug in Asterisk. Also people who tried doing that had also succeeded in getting calls to go through only one direction like from CCM to Asterisk. I am not that expert so excuse my ignorance with this

Hi all. We just put a relative large server in operation (for our measures ;-) ), a 4x Dual Core / Intel with 16GB Ram and a 3ware 9550SX SATA-RAID with 4 drives. Operating system for the Dom0 is an up-to-date gentoo linux. Everything runs really fine, there are 4 Domu''s running, 1x gentoo and 2x debian and 1x Windows Server 2003. DomU''s are running blazing fast in normal

Thank you for your help. Le 05/01/2015 19:10, John R Pierce a ?crit : > works here fine on the 9261, which is an OEM version of the same card > with the connectors in a different orientation... you might check your > LSI firmware revision. My firmware seems to be more up to date. Anyway, I will try to update firmware. I have to check how to do that. # dmesg |grep LSI scsi4 : LSI SAS

Great call, Jason. The trouble may also be from overclocking their CPU's. We ran into some similar bug reports in the Furthur project with people swearing up and down that random application hangs and glitches was our software (which in part it was). However, as soon as they brought their CPU's and video cards back to spec, their problems magically went away. I would follow this one up

From a buddy of mine that has spent a little time with the new cards. This was in response to my email asking about his impressions of them: It just came out in mid-September. There are a couple reasons I'm not thrilled with it: 1) no 8-port multilane version (only 12) 2) the 8-port non-multilane version is a kludge, connector-wise (a row of 3 double-stacked connectors along the

Here is the test code. foo<-function(x) exp(-x) for (i in 1:5) { foo<-function(x) foo(x)*x foo(2) } The error is "evalution nested too deeply". I tried Recall() but it didn't work either. Thanks a lot for your input.

hi list, i have a little problem with 2-node RAC using OCFS. the application running on this cluster does heavily index-based accesses. the data volumes are SAN volumes connected by fibrechannel. the throughput does not exceed 10mb/s, average is 7-8 mb/s. i've used 'iostat -x' and got rkB/s=8000 while %util=100% (device was saturated) from kernel's POV. i did some

Hi, I am seeing the following log lines on some accounts on my setup: Sep 11 01:42:36 xxxx dovecot: Panic: IMAP(xxxxxxxxxxxxxxxx): file index-sort-string.c: line 610 (index_sort_add_ids_range): assertion failed: (skip > 0) Sep 11 01:42:36 xxxx dovecot: IMAP(xxxxxxxxxxxxxx): Raw backtrace: imap [0x5555555d3690] -> imap [0x5555555d36f7] -> imap [0x5555555d2d58] ->

Greetings, I am looking for a hardware raid card that supports up to 4 SATA II hard disks with hot swap (compatible raid cage) I have short listed two LSI/3Ware cards: 1. 9750-4i 2. 9650SE-4LPML Both appear to be well supported in Linux. I would appreciate your personal experience with the CLI tools provided by LSI. Can they be configured to send email for disk failures or SMART errors? Is

On 29 August 2007, "Ross S. W. Walker" <rwalker at medallion.com> wrote: > Message: 39 <snip> > I wouldn't worry too much about the OS HD configuration, you are > always going to want RAID1 for the OS, whether software or hardware. > > Reason I say not to worry too much about the OS HD config is because > you are almost certainly going to put the

With all the recent discussion of SSD''s that lack suitable power-failure cache protection, surely there''s an opportunity for a separate modular solution? I know there used to be (years and years ago) small internal UPS''s that fit in a few 5.25" drive bays. They were designed to power the motherboard and peripherals, with the advantage of simplicity and efficiency

I have a rather large box (2x8-core Xeon, 96GB RAM) where I have a couple of disk arrays connected on an Areca controller. I just added a new external array, 8 3TB drives in RAID5, and the testing I'm doing right now is on this array, but this seems to be a problem on this machine in general, on all file systems (even, possibly, NFS, but I'm not sure about that one yet). So, if I use

Hi, I'm currently looking for a RAID controller with BBU/CacheVault and while LSI MegaRaid controllers worked well in the past apparently they are no longer supported in RHEL 8: https://access.redhat.com/discussions/3722151 Does anybody have recommendations for for hardware controllers with cache that should work in both CentOS 7 and 8 out of the box? Regards, Dennis