search for: nearlin

...use it?s so expensive that you can only use it for the limited amounts of data that actually benefit from, or require, the advantage in performance. For this application, it makes perfectly sense. > 3.5" SATA drives spinning at 5400 and 7200 rpm are the choice for large capacity bulk 'nearline' storage which is typically sequentially written once Why would you write them only once? Where are you storing your data when you do that?

...lse to make the > I/O a bit faster than what it currently does. I cannot go in for using > SSD's due to budget constraints. Need to make the best use of the SATA > disks that i have currently. so, you have 2x2 ST91000640NS http://www.seagate.com/products/enterprise-servers-storage/nearline-storage/enterprise-capacity-2-5-hdd/ those are "Nearline" disks, 7200RPM. They are intended for bulk secondary storage, archives, backups and such. you said you have a number of virtual machines all attempting to access this raid10 at once? I'm not surprised that it is slow. Yo...

...e IOPS. > > That?s not for storage because it?s so expensive that you can only use it > for the limited amounts of data that actually benefit from, or require, > the advantage in performance.? For this application, it makes perfectly > sense. > online high performance storage, vs nearline/archival storage. the first needs high IOPS and high concurrency.??? the 2nd needs high capacity, fast sequential speeds but little or no random access..??? two completely different requirements.? both are 'storage'. >> 3.5" SATA drives spinning at 5400 and 7200 rpm are the...

Happy Friday, List! I''m spec''ing out a Thumper-esque solution and having trouble finding my favorite Hitachi Ultrastar 2TB drives at a reasonable post-flood price. The Seagate Constellations seem pretty reasonable given the market circumstances but I don''t have any experience with them. Anybody using these in their ZFS systems and have you had good luck? Also, if

whats the state of support for self-encrypting drives in CentOS 6 ? these are becoming increasingly common on both laptops and for enterprise storage (particularlly nearline), with features like instant-erase via key destruction. -- john r pierce N 37, W 122 santa cruz ca mid-left coast

...I/O a bit faster than what it currently does. I cannot go in for >> using SSD's due to budget constraints. Need to make the best use of >> the SATA disks that i have currently. > > so, you have 2x2 ST91000640NS > http://www.seagate.com/products/enterprise-servers-storage/nearline-storage/enterprise-capacity-2-5-hdd/ > > > those are "Nearline" disks, 7200RPM. They are intended for bulk > secondary storage, archives, backups and such. > > you said you have a number of virtual machines all attempting to > access this raid10 at once? I'm...

Is it still the case that there is a kernel panic if the device(s) with the ZFS pool die? I was thinking to attach some cheap SATA disks to a system to use for nearline storage. Then I could use ZFS send/recv on the local system (without ssh) to keep backups of the stuff in the main pool. The main pool is replicated across 2 arrays on the SAN and we have multipathing and it''s quite robust. However I don''t want my mail server going DOWN if the...

Hi List All the imap sync apps I could find requires the username /password credentails to be known before a sync occurs. I have Dovecot using ldap acting as a nearline backup mail server to MS Exchange. Every hour imapsync syncs mail between Exchange and Dovecot. This all works fine becuase the users credentials are known, but when new users are added I would like the process to work seemless like this: The user is added to the Active Directory. The mail cli...

...ave been completely transitioned to btrfs for nearly a month with the only exception being a backup mirror drive formatted jfs that gets mounted and updated hourly via cron''d rsync and then immediately unmounted until the next update. I am using btrfs raid 1 across five 500GB Seagate nearline drives and btrfs single on a Seagate 4TB backup drive. I am absolutely delighted with how this system is working. This is my primary day in and day out system. I have to date hard crashed this system at least three times without sustaining any apparent damage to the filesystems. Perhaps I...

...al... > > Andy Lubel wrote: >> Hi All, >> >> I have been asked to implement a zfs based solution using storedge 6130 and >> im chasing my own tail trying to decide how best to architect this. The >> storage space is going to be used for database dumps/backups (nearline >> storage). What is killing me is that I must mix hardware raid and zfs.. > > Why should that be killing you? ZFS works fine with RAID arrays. What kills me is the fact that I have a choice and it was hard to decide on which one was going to be at the top of the totem pole. From...

...s on a SAS chain. I don't have any suitable hardware for running any tests or evaluations yet. general idea: 2 centos servers each with 8 port external SAS cards (2 x4), cascaded through a SAS box-o-disks with a whole bunch of SAS dual ported drives, to implement high availability large nearline storage. all storage configured as JBOD, using linux md raid or lvm mirroring. drives should only be accessible by the currently active server, with heartbeat managing the fencing. here's a hardware block diagram http://freescruz.com/shared-sas.jpg This is about the only details I&...

We recently had a disk fail on one of our whitebox (SuperMicro) ZFS arrays (Solaris 10 U9). The disk began throwing errors like this: May 5 04:33:44 dev-zfs4 scsi: [ID 243001 kern.warning] WARNING: /pci at 0,0/pci8086,3410 at 9/pci15d9,400 at 0 (mpt_sas0): May 5 04:33:44 dev-zfs4 mptsas_handle_event_sync: IOCStatus=0x8000, IOCLogInfo=0x31110610 And errors for the drive were

Richard Zimmerman wrote: > hw wrote: >> Next question: you want RAID, how much storage do you need? Will 4 or 8 3.5" drives be enough (DO NOT GET crappy 2.5" drives - they're *much* more expensive than the 3.5" drives, and >smaller disk space. For the price of a 1TB 2.5", I can get at least a 4TB WD Red. > > I will second Marks comments here. Yes,

While thinking about ZFS as the next generation filesystem without limits I am wondering if the real world is ready for this kind of incredible technology ... I''m actually speaking of hardware :) ZFS can handle a lot of devices. Once in the import bug (http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6761786) is fixed it should be able to handle a lot of disks. I want to

...r large arrays of SSDs, as they don't even come in 3.5". ?? With 2.5" you can pack more disks per U (24-25 2.5" per 2U face, vs 12 3.5" max per 2U)... more disks == more IOPS. 3.5" SATA drives spinning at 5400 and 7200 rpm are the choice for large capacity bulk 'nearline' storage which is typically sequentially written once -- john r pierce, recycling bits in santa cruz

...s, as they don't even come in 3.5". ?? With 2.5" > you can pack more disks per U (24-25 2.5" per 2U face, vs 12 3.5" max > per 2U)... more disks == more IOPS. > > 3.5" SATA drives spinning at 5400 and 7200 rpm are the choice for large > capacity bulk 'nearline' storage which is typically sequentially written > once > We have a fair number of SAS 3.5" drives, and yes, 10k or 15k speeds. mark

...At home I am in the process of moving all my data from a Linux NFS server to OpenSolaris. It''s something I''d been meaning to do ever since I heard Jeff Bonwick talk about ZFS at LISA ''07. My plan was: - mirrored zfs pool on an OpenSolaris host, exported via NFS/Samba - nearline amanda backups on the same host, but to an external eSATA mirrored zfs pool - archival amanda backups on my old Linux host That plan would involve three zfs pools: - root pool on OpenSolaris host - mirrored storage pool on OpenSolaris host - mirrored external pool How do I protect these zfs pool...

We're looking at getting an HBR (that's a technical term, honkin' big RAID). What I'm considering is, rather than chopping it up into 14TB or 16TB filesystems, of using xfs for really big filesystems. The question that's come up is: what's the state of xfs on CentOS6? I've seen a number of older threads seeing problems with it - has that mostly been resolved? How does

Hi all, I was recently charged with configuring a new fairly large (24x3TB disks) fileserver for my group. I think I know mostly what I want to do with it, but I did have two questions, at least one of which is directly related to CentOS. 1) The controller node has two 90GB SSDs that I plan to use as a bootable RAID1 system disk. What is the preferred method for laying out the RAID array? I

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