similar to: internal backup power supplies?

Now the test for the Vertex 2 Pro. This was fun. For more explanation please see the thread "Crucial RealSSD C300 and cache flush?" This time I made sure the device is attached via 3GBit SATA. This is also only a short test. I''ll retest after some weeks of usage. cache enabled, 32 buffers, 64k blocks linear write, random data: 96 MB/s linear read, random data: 206 MB/s linear

I recently got a new SSD (ocz vertex LE 50gb) It seems to work really well as a ZIL performance wise. My question is, how safe is it? I know it doesn''t have a supercap so lets'' say dataloss occurs....is it just dataloss or is it pool loss? also, does the fact that i have a UPS matter? the numbers i''m seeing are really nice....these are some nfs tar times before

Your question is difficult to parse. Typically RAID and JBOD are mutually exclusive. By "flash-backed", do you mean a battery backup unit (BBU) on your RAID controller? On Mon, Apr 9, 2018 at 8:49 AM, Vincent Royer <vincent at epicenergy.ca> wrote: > >> Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb >> flash? >> > > Is anyone

I just want to ask how to enlarge the resolution of my plots in R. For ex. for publising I would like a picture of resolution minimal 500 dpi, all I managed was picture of dim 5,28 X 5,83 with 118 pixels/cm. Thank You for the answer! With best regards, Darja Rupnik [[alternative HTML version deleted]]

.. evidently doesn''t work. GRUB reboots the machine moments after loading stage2, and doesn''t recognise the fstype when examining the disk loaded from an alernate source. This is with SX-151. Here''s hoping a future version (with grub2?) resolves this, as well as lets us boot from raidz. Just a note for the archives in case it helps someone else get back the afternoon

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

Yes the flash-backed RAID cards use a super-capacitor to backup the flash cache. You have a choice of flash module sizes to include on the card. The card supports RAID modes as well as JBOD. I do not know if Gluster can make use of battery-backed flash-based Cache when the disks are presented by the RAID card in JBOD. The Hardware vendor asked "Do you know if Gluster makes use of

I sent a zvol from host a, to host b, twice. Host b has two pools, one ashift=9, one ashift=12. I sent the zvol to each of the pools on b. The original source pool is ashift=9, and an old revision (2009_06 because it''s still running xen). I sent it twice, because something strange happened on the first send, to the ashift=12 pool. "zfs list -o space" showed figures at

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

Hello, Just a couple questions regarding RAID. Here's thesituation. I bought a 4TB drive before I upgraded from 6.8 to 7.3. I'm not too far into this that Ican't start over. I wanted disk space to backup 3 other machines. I way overestimated what I needed for full, incremental and image backups with UrBackup.I've used less than 1TB so far. I would like to add an additional drive

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

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

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

I have a Solaris 10 update 6 system with a snapshot I can''t remove. zfs destroy -f <snap> reports the device as being busy. fuser doesn''t shore any process using the filesystem and it isn''t shared. I can unmount the filesystem OK. Any clues or suggestions of bigger sticks to hit it with? -- Ian.

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

Hi, I've got a new server with a 3ware 9550SXU with the Battery. I am using FreeBSD 7.0-Release (tried both 4BSD and ULE) using AMD64 and the 3ware performance for writes is just plain horrible. Something is obviously wrong but I'm not sure what. I've got a 4 disk RAID 10 array. According to 3dm2 the cache is on. I even tried setting The StorSave preference to

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, I am running several virtualization servers with QEMU 1.4.x and libvirt 1.0.2 on Ubuntu 12.04 and am working on optimizing the cache= and aio= options for the virtual machines. These VM images are mostly qcow2, and are served both from a local ext4 filesystem (with data=ordered,barrier) and from an NFS mountpoint (with sync). The local filesystem sits on top of an md software RAID of SATA

On Jun 28, 2019, at 8:46 AM, Blake Hudson <blake at ispn.net> wrote: > > Linux software RAID?has only decreased availability for me. This has been due to a combination of hardware and software issues that are are generally handled well by HW RAID controllers, but are often handled poorly or unpredictably by desktop oriented hardware and Linux software. Would you care to be more